The Mercury Racing Apex Series  competition outboards represent cutting-edge engineering designed for peak closed-course racing performance. These models are crafted to deliver high torque, exceptional speed, and reliable durability. Here's a closer look at the specifications (Specs) and features for each model in the lineup: 360 APX Specs The Mercury Racing 360 APX is a powerhouse designed specifically to drive Formula One tunnel boats in the UIM F1H2O World Championship. This competition outboard features a 4.6-liter V8 powerhead with 32-valve Dual Overhead Cam (DOHC) architecture. With an output of 360 horsepower (268 kW) and a maximum wide-open throttle (WOT) RPM of 7000, the 360 APX delivers unparalleled torque and acceleration for top-tier racing performance. It is engineered for use with 89-octane unleaded fuel and features the IV SSM gearcase with a 1.13 gear ratio. The dry weight of the engine is 430 lbs (195 kg), making it a durable yet lightweight solution for high-speed competition. 250 APX Specs The 250 APX model brings formidable power and precision to APBA Formula 1 powerboat racing. Sharing many features with the 360 APX, the 250 APX also boasts a 4.6-liter V8 engine with 32-valve DOHC design, but it is tuned to produce 250-260 horsepower (184 kW). The maximum WOT RPM reaches 6800, ensuring responsive acceleration and excellent midrange power delivery. This outboard is also optimized for unleaded 89-octane fuel and includes an evolved version of the IV SSM gearcase with a 1.13 gear ratio. Weighing in at 436 lbs (198 kg) dry, the 250 APX offers a powerful yet manageable engine solution for competitive racing applications. 200 APX Specs For UIM F2 and APBA OPC tunnel boat racing, the Mercury Racing 200 APX provides a potent combination of power and efficiency. This model is equipped with a 3.4-liter V6 powerhead, featuring a 24-valve Dual Overhead Cam (DOHC) design. Delivering 200-240 horsepower (149 kW) and capable of reaching a maximum WOT RPM of 6800, the 200 APX delivers race-winning torque and durability while significantly reducing emissions. The engine uses unleaded 89-octane fuel and incorporates the IV SSM gearcase with a 1.13 gear ratio. Weighing 395 lbs (179 kg) dry, the 200 APX strikes an ideal balance between power and lightweight design. 60 APX Specs The Mercury Racing 60 APX is designed to introduce up-and-coming racers to the competitive scene in UIM Formula 4 class racing. This compact yet powerful outboard features a 1.0-liter Inline-4 engine with a Single Overhead Cam (SOHC) and eight valves. Delivering 60 horsepower (45 kW) and a maximum WOT RPM range of 6000-6400, the 60 APX is built for consistent performance and low-maintenance reliability. Optimized for unleaded regular 87-octane fuel, it features a 3.4" gearcase and weighs just 247 lbs (112 kg) dry, offering a lightweight and dynamic option for emerging racers.

While the Buckshot Racing #77 Speed Store remains fully committed to maintaining high-performing 2-stroke outboards, it's noteworthy that most 2-stroke models are no longer in production. For the 2025 model year, Mercury Racing introduces a robust lineup of eleven 4-stroke high-performance outboard engines, specifically engineered for recreational boating and competitive racing enthusiasts. Below is a comprehensive list of the 2025 Mercury Racing outboard models, comprising seven in the R-Series and four in the Competition Series: R-Series Outboards: Designed for high-performance recreational boating, the R-Series engines deliver exceptional power and acceleration. Mercury Racing 500R Horsepower:  500 HP Engine Type:  4.6L V8 Supercharged Dry Weight:  726 lbs Features:  The 500R offers elevated power and technology, featuring a new 4.6L V8 powerhead with upgraded components, increased supercharger boost pressure, and an Advanced Racing Core (ARC) midsection for enhanced durability and performance. Mercury Racing 400R Horsepower:  400 HP Engine Type:  5.7L V10 Dry Weight:  695 lbs Features:  The 400R sets a new standard of performance with advanced features, custom graphics, and a wide range of parts compatibility, making it suitable for various high-performance boating applications. Mercury Racing 300R Horsepower:  300 HP Engine Type:  4.6L V8 Dry Weight:  512 lbs Features:  The 300R is tuned with Mercury Racing components to deliver crisp throttle response and thrilling top-end power. It offers multiple midsection and gearcase options to tailor performance to specific applications. Mercury Racing 250R Horsepower:  250 HP Engine Type:  4.6L V8 Dry Weight:  520 lbs Features:  The 250R provides class-leading performance with a 10% increase in fuel efficiency, offering a lower cost of ownership without compromising on power. Mercury Racing 200R Horsepower:  200 HP Engine Type:  2.6L V6 Dry Weight:  469 lbs (torq master) 489 lbs (sportmaster) Features:  The 200R delivers robust performance in a compact package, ideal for smaller high-performance boats requiring a balance of power and agility. Mercury Racing 150R Horsepower:  150 HP Engine Type:  3.4L V6 Dry Weight:  475 lbs Features:  The 150R is the perfect entry point for sophisticated boaters seeking the performance and luxury refinement of Mercury Racing R-Series power. It features a smooth and efficient V6 powerhead coupled with advanced Digital Throttle & Shift (DTS) control capability. Mercury 60R Horsepower:  60 HP Engine Type:  1.0L L4 Dry Weight:  268 lbs Features:  The 60R is built with speed in mind, designed specifically for technical flats skiffs to deliver performance with outstanding fuel economy, rugged reliability, and quiet operation. Mercury Racing R-Series Competition Series Outboards: Engineered for professional racing, the Competition Series outboards are designed to meet the rigorous demands of competitive tunnel boat powerboat racing. Mercury Racing 360 APX Horsepower:  360 HP Engine Type:  4.6L V8 Dry Weight:  430 lbs Features:  The 360 APX is a potent competition outboard designed specifically to power Formula One tunnel boats in the premier class of the UIM F1H2O World Championship. It delivers impressive torque from a durable, low-emissions four-stroke V8 powerhead that sets a new benchmark for circuit-racing performance. Mercury Racing 250 APX Horsepower:  250+ HP Engine Type:  4.6L V8 Dry Weight:  436 lbs Features:  The 250 APX joins the competition portfolio to open a new competitive era in APBA Formula 1 and UIM F2 powerboat racing. It is tuned to deliver race-winning torque and acceleration combined with outstanding durability and a cost-effective, race-winning advantage over legacy two-strokes. Mercury Racing 200 APX Horsepower:  200+ HP Engine Type:  3.4L V6 Dry Weight:  395 lbs Features:  The 200 APX is a powerful V6 four-stroke outboard designed for UIM F2 and APBA OPC tunnel boat racing. It offers racers a very durable powerhead and the latest in four-stroke engine technology, while reducing exhaust emissions by 90 percent compared to legacy two-stroke competition outboards. Mercury Racing 60 APX Horsepower:  60 HP Engine Type:  1.0L L4 Dry Weight:  247 lbs Features:  The 60 APX is designed specifically for up-and-coming racers competing in UIM Formula 4 class competition. It has been expertly tuned to run at a wide-open throttle limit of 6000-6400 rpm, delivering all the adrenaline of the legendary Apex competition series in a lightweight, compact package. Mercury Racing APX Series Mercury Racing's dedication to innovation and performance is evident in both their R-Series and Competition Series outboards, catering to the needs of high-performance boating enthusiasts and professional racers alike. Let us know your thoughts!

For high-performance boating enthusiasts, finding the perfect destination means looking for the best water conditions, scenic beauty, and convenient boat launches, paired with excellent accommodations. Here’s a guide to ten of the top high-performance boating destinations in the USA, with everything you need to know for an unforgettable experience on and off the water. 1. Lake Havasu, Arizona Why It's Great:  Known as the "Hot Boat Capital of the World," Lake Havasu features warm waters, breathtaking desert landscapes, and hosts events like the Desert Storm Poker Run, drawing high-performance boaters from across the country. Boat Launches:  The Nautical Beachfront Resort offers a private boat launch ramp for hotel guests, providing easy and exclusive access to the lake. Accommodations:  The Nautical Beachfront Resort is a top choice, offering beachfront rooms, complimentary boat docks, and direct lake access, perfect for boaters looking for luxury and convenience. 2. Lake of the Ozarks, Missouri Why It's Great:  This large reservoir boasts winding waterways and hosts major boating events like the Lake of the Ozarks Shootout, one of the largest high-speed boat races in the country. Boat Launches:  Many resorts offer private boat ramps, such as Rippling Waters Resort, which features a concrete launch and covered docks. Accommodations:  Margaritaville Lake Resort offers a full-service marina, multiple dining options, and numerous recreational activities for a comprehensive getaway experience. 3. Key West, Florida Why It's Great:  Boating in Key West offers stunning ocean views, tropical weather, and numerous high-speed boating events, including the famous Key West Offshore World Championship. Boat Launches:  Garrison Bight Marina offers public boat ramps with easy access to the Atlantic Ocean. Accommodations:  The Perry Hotel & Marina Key West offers luxury accommodations and a full-service marina, ideal for boating enthusiasts. 4. Miami, Florida Why It's Great:  Miami offers a vibrant boating culture, turquoise waters, and direct ocean access, making it a prime spot for high-speed boating. The Miami Boat Show is a popular event drawing boaters from around the globe. Boat Launches:  The Matheson Hammock Park Marina features ramps providing convenient access to Biscayne Bay. Accommodations:  The Ritz-Carlton Key Biscayne offers luxurious lodging with easy access to the local boating scene. 5. Clear Lake, Texas Why It's Great:  This destination near Houston offers high-performance boaters access to both Clear Lake and nearby Galveston Bay, known for its smooth waters and ample space for speed enthusiasts. Boat Launches:  Clear Lake Park offers multiple ramps for boaters to easily access both Clear Lake and Galveston Bay. Accommodations:  South Shore Harbour Resort provides waterfront accommodations and convenient marina access for high-performance boating fans. 6. Chesapeake Bay, Maryland/Virginia Why It's Great:  The Chesapeake Bay offers expansive waters, charming coastal towns, and a strong boating community, perfect for fast-paced boating and leisurely cruising alike. Boat Launches:  Sandy Point State Park features public ramps with direct access to the bay. Accommodations:  The Inn at Perry Cabin offers upscale lodging and marina services, ensuring comfort after a day on the water. 7. Lake Cumberland, Kentucky Why It's Great:  Lake Cumberland is known for its deep water and scenic surroundings, hosting events like the Thunder Run, which draw high-speed boating enthusiasts every year. Boat Launches:  Lake Cumberland State Resort Park offers several boat ramps for easy access to the lake. Accommodations:  The Lake Cumberland State Resort Park offers lodge rooms, cabins, and spectacular views of the water. 8. Lake Michigan (Chicago, Illinois) Why It's Great:  Boating along Chicago’s Lake Michigan shoreline provides a thrilling urban backdrop with wide-open waters ideal for high-speed adventures, coupled with views of the iconic Chicago skyline. Boat Launches:  The 31st Street Harbor features ramps that provide access to Lake Michigan. Accommodations:  The Langham, Chicago offers luxury lodging near the lakefront, combining urban luxury with proximity to Lake Michigan’s boating opportunities. 9. Lake Erie Islands, Ohio Why It's Great:  With islands like Put-In-Bay, this destination offers clear waters, great beaches, and a vibrant boating atmosphere, perfect for high-speed boating enthusiasts. Boat Launches:  Catawba Island State Park has public ramps for easy access to Lake Erie and its islands. Accommodations:  The Put-in-Bay Resort & Conference Center is a prime spot, offering comfortable lodging and close proximity to marinas. 10. Mississippi River (Various Locations) Why It's Great:  Popular for poker runs and speed events, the Mississippi River offers long stretches of navigable waters, winding through diverse scenery ideal for boating adventures. Boat Launches:  The Port of Dubuque Marina in Iowa features ramps with access to the Mississippi River. Accommodations:  Hotel Julien Dubuque provides comfortable and stylish accommodations near the riverfront, perfect for winding down after a day on the water. Each of these destinations offers high-performance boating enthusiasts the ideal mix of thrilling waters, convenient boat launches, and excellent accommodations to make for a memorable trip. Whether cruising across the wide waters of Lake Michigan or exploring the tropical beauty of Key West, these spots guarantee a fantastic boating experience. Let us know what we missed in the comments.

Numbered drill bit sizes range from 80 (smallest) to 1 (largest). The numbers on numbered drill bits relate to wire gauges, so larger numbers indicate smaller drills. Mercury 2-stroke outboard carb jet sizes, on the other hand, are related to thousandths of an inch which matches typical jet sizes found in both main and air jets in WH, WMV, WMH, and other carburetor types. A jet size primary passage bore in diameter indicates flow rate. Larger main jets (which carry fuel) are "fatter", while, larger air jets (which carry air) make those circuits "leaner". While jets should be reamed or bored (not drilled) to ensure a consistent diameter, drilling jets can be an affordable way to make bigger jets to save or tune a motor that is too lean. This numbered drill bit chart is correlated with typical outboard carburetor jet sizes. Numbered drill bit kits can be purchased at your favorite tool stores. We've created this chart as a convenient reference with the most common numbered drill bits sizes (39 to 59) used to enlarge more common smaller jets to larger sizes when otherwise not available to purchase. To drill a jet with numbered drill bits, you can try these steps: Run the engine with the stock main jet, and determine if too lean If lean, use a drill bit that's one size larger to drill out the jet Run the engine again and take another read Repeat until jetted properly Below is a free printable cheat sheet included in our Carburetor Jet Number Drill Bit Kits!

(Mike Hill summary from Jerry Hale's post 10 years ago) My name is Jerry Hale, and I was the project engineer for Mercury’s (Black Max) 2-liter, 2-stroke, V6 outboard. To authenticate my position, you can reference the following patents in my name (David Jerry Hale, as I go by my middle name): Patent #4 ,092,958 (Internal Combustion Engine), Patent #4 ,066,057 (Cylinder Head Mounting Apparatus for Internal Combustion Engines), and Patent #4 ,082,068 (V-Engine Cooling System Particularly for Outboard Motors and the Like). All patents are assigned to Brunswick Corp and pertain to the V6. There seems to be interest in how this engine came about, so I thought I would document what happened 43 years ago before Alzheimer’s sets in. I intend to share this in small, weekly installments as best as I can manage. The project began in January 1970 at Mercury’s Outboard Engineering Plant #6  in Oshkosh, WI. The initial study presented to me aimed to determine the optimal engine configuration (inline, V, or opposed) and the number of cylinders. It was to be a looper with 2 liters of displacement, capable of being bored for an additional 10% increase, featuring a die-cast block, and designed for the lightest weight and smallest possible size. The power goal was at least 10% higher than the 1350 (135 HP) inline-six then in production, targeting 150 HP. Keith and Ralph were both part of my team at the beginning of the 951 (V6) project, though I do not recognize the Triechel name. He is not listed on the Plant 6 honor roll, which includes everyone who ever worked there, including notables like Carl Kiekhaefer, Charles Alexander, Charlie Strang, and several guest workers such as Tony Bettenhausen, Briggs Cunningham, Tim Flock, Bill France, Ted Jones, Jack Leek, Maury Rose, Red Vogt, “Gorgeous George” Wagner, Lee Wallard, Phil Walters, and Gar Wood Jr. These individuals were all gone before I arrived in March 1965. Some were associated with Mr. K’s car racing in the 1950s, remnants of which were still visible in the garages, including car lifts and valve grinding equipment. Ron Anderson and Joe Harrelson joined the V6 project shortly after it began and contributed significantly. Ron transformed the production “Black Max” into the T3 race engine and later opened a prop shop and marina in Seattle. Joe became a college professor in California, teaching engine design, and designed a large V4 engine used in a world motorcycle speed record attempt. Other key figures included Bob Johnson (RTJ), manager of Outboard Engineering, who provided the engine requirements list. It is likely he initiated the “Black Max” V6 idea. Carl Kiekhaefer, by then, was mostly out of the picture and likely unaware of the new engine. Contributors also included Dick Lanpheer (sound and vibration engineer), Al Tyner (board man and detail designer), Dave Kusche (cowling design), Art Miller (stylist), Elmer Croisant (undercarriage), Bob Schmeidel (electrical), and Jim Meininger (carburetion). Bob Johnson’s handwritten spec sheet from January 1970 outlined the objectives: OBJECTIVE: RAISE MAX. POWER 10% = 150HP. 1. A 10% displacement increase is inappropriate – no room for future increases, bore increase will increase detonation problems. 2. A 20% displacement increase fits the 2-liter class. 3. Bore: 2 7/8" (1350 size), Stroke: 2.35" = 15.25 cu. in.; 8-cyl = 122 cu. in., 6-cyl = 91.5 cu. in., 4-cyl = 61 cu. in. 4. Develop loop cylinder to avoid cross-scavenged problems. 5. V configuration supports loop cylinder spacing. 6. Design for a potential 10% displacement increase later (bore only). 7. Target lightest weight and smallest package size. Bob was thinking about using the same parts for economy of scale, even considering a 2-liter V8, which I found impractical. For racing, a six-cylinder arrangement was ideal for exhaust pulse tuning. After deciding on a 60° V6 configuration due to its compact design and optimal characteristics, I needed to study loop-scavenged engines, choosing the Husqvarna 360 motorcycle as my model. I tested the engine, impressed by its power characteristics and torque band. I then performed flow tests using a “Jante Fixture,” named after the German engineer Alfred Jante, who developed the method for analyzing transfer passages. “Old Blue,” the first sand-cast V6, proved to be reliable and powerful, reaching up to 204 HP at over 6,000 RPM during tests. This engine became legendary and survived decades, eventually rediscovered in a neglected state before I restored it partially. Further technical challenges involved compacting transfer passages, designing the cooling system, and creating the cylinder head and piston shapes. Innovations included using a hemi head combustion chamber, double-pass cooling for even temperature distribution, and designing a die-cast block with blister liners to form internal passages. The original clam-shell cowl design allowed easy access to the engine components but was later replaced with a top cowl design due to user complaints. The ignition system also evolved from a distributor-based system to a six-coil, distributor-less design, significantly delaying production. Despite setbacks, including OMC’s unexpected release of their 200 HP V6, Mercury’s “Black Max” prevailed, marking its place as an engineering success and remaining in production decades later.

We've included free instructions that can be downloaded here in PDF on how to install our SeaStar Hydraulic Steering Cylinder Seal Rebuild Kit with the proper required Pin Wrench included as well as new end caps. Free PDF Install Instruction Here: This Replacement Parts Rebuild Kit is compatible with Multiple Sea Star Marine Hydraulic Steering Systems including Part Numbers: HC5345, HC5347, HC5348, HC5358, HC5445, HC6345, HC6750, HC6751, HC6752, HC6753, HC6754, HC6755, HS5167

The Yamato 302 is a racing outboard motor designed for the UIM outboard series OSY 400. Model 302 is a 24.2 cubic inch stock racing engine. Like its predecessors, this motor was developed specifically for use: in the multi-billion dollar pari-mutuel boat racing industry in Japan. The motors are first raced in stadiums in Japan and then rebuilt and inspected in the factory before being delivered to APBA and UIM circuit racers. These motors are required to run heat after heat, day after day with perfect reliability at racing speeds. Download the Yamato Service & Technical Manual in PDF

This setup guide should help users smoothly install the Electronic Power Steering (EPS) 220W, 400W, or 600W Kit for Boat Racing while following common practices. Kit Contents Mount (A) Shafts (B) M10-1.50 x 20mm Flat Head Cap Screws (C)  - Qty: 4 M8-1.25 x 20mm Hex Head Cap Screws (D)  - Qty: 2 Electronic Control Unit (ECU) (E) Motor (F) Wiring Harness (G) Wiring Connectors Kit (H) Installation Steps Preparation Download and read all instructions carefully and check illustrations for reference. Ensure all gaskets in electrical connections are properly seated. If needed, use a flathead screwdriver for adjustment. Mounting the ECU Choose an ideal location for the ECU (E) within the vehicle. Secure the ECU with M8 hardware (D). Attaching the Motor Modify the Mount (A) as needed. Secure the Motor (F) to the modified Mount using M10 hardware (C). Installing the Shafts Adjust Shafts (B) as required. Attach them to the Motor (F) using the provided hardware. Wiring Connections Connect the wires from the Motor (F) to the ECU (E). Ensure all connections are secured and follow the color-coded wiring instructions: White Wire  - LED diagnostic light Red Wire  - Battery positive (+) Black Wire  - Battery negative (-) Switched 12V Source  - for ignition power Diagnostic Check Turn on the ignition to activate the system. The LED diagnostic light should flash once for about a second and then turn off, indicating proper function. Notes Do not discard steering kit packaging until installation is verified. Ensure compliance with local, state, and federal laws for use. We are not liable for modifications to this product outside stock configurations or for use with aftermarket parts. For additional information and visual aids, download the pdf install guide below!

For high-performance 2-stroke outboard enthusiasts, fine-tuning every detail of an outboard engine can be the difference between winning and losing or running well and not running. One of the most crucial tuning elements is setting your maximum ignition timing advance. Ignition timing dictates when the spark plug fires relative to the piston’s position in the cylinder, impacting power, efficiency, and engine longevity. This guide, paired with an easy-to-use HTML timing calculator, will help boat owners and racers achieve optimal ignition timing for their 2-stroke Mercury V6 and OMC V6/V8 outboards. Why Proper Maximum Timing Advance Matters Ignition timing plays a major role in your engine’s performance, fuel efficiency, and reliability. Incorrect timing can lead to serious engine problems like pre-ignition, detonation, or even catastrophic damage. Understanding how to set and analyze ignition timing is essential for maximizing performance while maintaining engine health. How to Leverage this Guidance Tool Our interactive HTML tool lets you adjust max timing advance by selecting a value between 0° and 40° BTDC (Before Top Dead Center) with a slider. The tool displays real-time feedback on the engine’s potential behavior based on the chosen timing. Here’s the general guidance for each max timing range: - **0° to 4° BTDC**: Timing is extremely retarded, leading to severe power loss, rough idling, and inefficient combustion. - **5° to 10° BTDC**: Timing is still retarded, resulting in reduced power and possible misfires. - **11° to 12° BTDC**: The engine runs, but power and fuel economy are below optimal levels. - **13° to 16° BTDC**: Suitable for some OMC V6 or V8 models, but not ideal for peak performance in Mercury V6s. - **17° to 19° BTDC**: Too low of a range for optimal Mercury V6s performance; Way too high for most OMC V6 and V8 models. - **20° to 22° BTDC**: Safe advance with a good range of performing for most Mercury V6s; 2.0, 2.4, and 2.5 Liters. - **23° to 25° BTDC**: Slightly advanced, providing more power but starting to increase the stress on engine parts. Premium pump gas is recommended. - **26° to 27° BTDC**: Highly advanced, delivering noticeable power gains but with high risk of pre-ignition and component stress. Use higher-octane race fuel and a richer mixture. - **28° to 30° BTDC**: Extremely advanced, offering significant power up to 6,500 RPM, but performance drops above 7,000 RPM. Reserved for short drag races with high-octane fuel and enriched mixtures. - **31° BTDC and above**: Excessively advanced and dangerous, risking severe detonation and catastrophic engine failure—proceed at your own peril. Practical Tips for Everyday Boaters and High-Performance Users Understanding these timing ranges is essential for racers and performance enthusiasts looking to push their engines to the limit. For recreational boaters, Mercury V6s often perform best between 20° and 22° BTDC, while the OMC V6 and V8 should be between to 12° and 14°. For River Racers, Mercury V6s often perform best between 24° and 25° BTDC, while the OMC V6 and V8 should be around 14°. For Circuit and Circle Boat Racer, Mercury V6s often perform best between 25° and 27° BTDC, while the OMC V6 and V8 should be around 14° to 16°. For Outboard Drag Racers, the Mercury V6 can run 28° to 30° BTDC full advance for 660 to 800 feet, and while fully aware of the need for specialized fuel and close monitoring, while the OMC V6 and V8 could creep up to 16°. Why Bother with More Timing Advance Advancing ignition timing before top dead center (BTDC) in a 2-stroke outboard engine increases horsepower by optimizing combustion. Igniting the fuel-air mixture earlier allows peak cylinder pressure to occur right around or just after TDC, ensuring the maximum force pushes the piston down during the power stroke. This timing improves energy transfer and torque, boosting power output. Earlier ignition in the upward piston stroke gives more time for the fuel to burn completely. At higher RPMs, pistons move quickly, and advanced timing compensates for the reduced combustion window, maintaining efficient power generation. The result is higher cylinder pressure at the optimal moment, which maximizes power extraction from the expanding gases. However, advancing timing too much can lead to pre-ignition and detonation, causing severe damage due to uncontrolled pressure and heat. The engine will also start to "fight against it's momentum" as the RPMs exceed a certain point. Key Points to Remember **Prioritize Safety**: Advanced timing can deliver impressive power but comes with higher risks. **Choose the Right Fuel**: High-octane race fuel and richer mixtures are crucial for advanced timing settings to prevent engine detonates. **Monitor Your Engine**: Use real-time feedback and diagnostic tools to ensure safe operation and avoid long-term damage. By using this timing tool and understanding what each setting means, you can optimize your 2-stroke outboard’s performance and maintain engine health. Whether you’re a racer or a performance enthusiast, finding the balance between power and reliability is key to staying ahead of the competition.

This is a free online resource to find mostly out-of-production, no longer available Mercury Racing Owners Manuals with specifications for V6 2-stroke outboards and a few currently produced 4-stroke outboard models. All are in PDF files making them available for online download to your desktop computer, laptop, or as a file to your mobile phone. Once downloaded, PDF files can be printed for your use. 2-Stroke Owners Manuals with Specs Mercury Racing 3.0 Liter 300X Pro Max w/ Sportmaster Manual - Free The below service manuals are available for purchase:

This is a free online resource to find mostly out-of-production, no longer available Mercury Racing Owners Manuals with specifications for V6 2-stroke outboards and a few currently produced 4-stroke outboard models. All are in PDF files making them available for online download to your desktop computer, laptop, or as a file to your mobile phone. Once downloaded, PDF files can be printed for your use. 2-Stroke Owners Manuals with Specs Mercury Racing 2.5 Liter EFI 260 ROS Manual Mercury Racing 2.5 Liter s3000 / F1 w/ SSM #4 (Superspeed Master) Manual Mariner / Mercury Racing 2.5 Liter Super Magnum 200 and 225 HP Manual Mercury Racing 3.0 Liter 300X Pro Max w/ Sportmaster Manual Mercury Racing 200XS Optimax Manual Mercury Racing 2.5L Pro Max 225X Manual Mercury Racing SST 200XS Optimax F2 w/ SSM #6 Manual Mercury Racing 2.5L F1 Tunnel Manual Mercury Racing 3.2 Liter 300XS Optimax Manual Mercury Racing 2.5 Pro Max 225 Manual Mercury Racing 225 Sport XS Optimax Manual Mercury Racing SST-120 2.0 Liter Manual Mercury Racing 150 HP, 200 HP, 225 HP ProMax Manual Mercury Racing 280 ROS Manual Mercury Racing 300 Pro Max 3.0 Liter Manual Mercury Racing XR2 2.0 Liter Manual Mercury Racing 225 OptiMax 2.5XS Manual Mercury Smartview Smartcraft Race Edition for Optimax Manual 4-Strokes Owners Manuals with Specs Mercury Racing 200 APX & 360 APEX Competition Outboard Tech Specs Mercury Racing 60R Manual Mercury Racing 250R and 300R Manual Mercury Racing 300R HD Manual Mercury Racing 450R Manual The below service manuals are available for purchase:

This is a free online resource to find mostly out-of-production, no longer available Mercury Racing Owners Manuals with specifications for V6 2-stroke outboards and a few currently produced 4-stroke outboard models. All are in PDF files making them available for online download to your desktop computer, laptop, or as a file to your mobile phone. Once downloaded, PDF files can be printed for your use. 2-Stroke Owners Manuals with Specs Mariner 2.5 Liter Super Magnum 200 and 225 HP Manual - Free The below service manuals are available for purchase: