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Increase horsepower 2 stroke outboard. Did same thing with a 9.


  • Increase horsepower 2 stroke outboard. I know this would involve modifications within the engine and nor bolt on stuff. 9hp. I think it is about 15 years old. Jun 25, 2024 · To keep an outboard engine running to its designed potential, it needs to be properly set up and maintained. A very common thing to do here in South Louisiana is to install carbs from a mercury 60 on the mercury 40 (We have some marshes that limit Mar 20, 2011 · Mercury 50 HP 2-Stroke Performance Upgrade Can anyone recommend a mechanic to use to install performance reeds and 60 HP carbs on my 2002 Mercury 50 HP 2-stroke? I live close to Camden, SC but can take it 50-75 miles to have the work done. 5 Liters) are iconic in the performance marine world, powering everything from recreational boats to race-winning machines. Based on the average use of 200 hours per year, this will last 7-8 years. These engines produce between 135 HP and over 300 HP depending on the model and tuning. There is a guy in South Carolina that specializes in the 40-50 hp motors. This article has shed light on the importance of this aspect and provided a comprehensive guide to diagnose and resolve issues when your outboard isn’t reaching its full potential. 5 liter V6 but CCMS provides composite and high performance parts for all the top manufacturers of two stroke outboards. Feb 10, 2012 · Re: How to get more out of a 15hp 2 stroke yamaha? Not many options regarding hot-rodding modern outboard motors. 9hp giving boaters the freedom to use their engine without a title. In this comprehensive guide, we unravel top propeller options tailored for your specific engine needs, ensuring smooth and efficient Enjoy classic TwoStroke speed, power and performance thanks to high-displacement powerheads and exceptionally lightweight designs. buying a 300 HP engine. com, more Mercury then OMC, but a lot of information. I am considering selling it for something up to 70hp but the weight of the yamaha is making me think it is maybe a base for a more powerful engine Right now, owners of underpowered vessels and owners desiring performance gains can take full advantage of a economical, simple and safe solution to increase horsepower and performance, this is the Process and Procedure of “Flashing”,” Re-Mapping” or “Tuning” the Electronic Control Unit (ECU). more Dec 22, 2001 · How do I increase the horse power on a 2000 Mercury Optimax 115hp? Where can I get the parts (computer chips etc. 9hp outboard "upgraded" to a 15hp. Outboard manufacturers have recommended RPM ranges for their specific models. Does anyone know if that can be done on this particular engine? Jan 9, 2016 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Right now, owners of underpowered vessels and owners desiring performance gains can take full advantage of a economical, simple and safe solution to increase horsepower and performance, this is the Process and Procedure of “Flashing”,” Re-Mapping” or “Tuning” the Electronic Control Unit (ECU). It is only geared to turn so much HP. As an example, a 2-stroke Yamaha 15 HP outboard weighs about 80-84 pounds while you can expect the weight of a 4-stroke model to be in the ballpark of 111-132 pounds. Jun 24, 2008 · Re: How to get more HP out of my Yamaha Since the 40 and 50 HP Yammy share a common power head, you can get a parts list for both motors and go through them item by item. If you increase the main jet size to put more fuel in the engine, but don't put any more air in at the same time, the engine will overfuel, bog and won't run well. the is also true for the 60, except the exhust is different. ) necessary to do this? Is this an electronic/computer chip job? Thanks. Jan 4, 2020 · The kit I have is for a Mercury 2. Whay you cannot do (cheaply) is change the porting on the block which is often where additional power is achieved. Mercury used the same displacement for their 40, 50, and 60hp engines. This comprehensive guide aims to be your compass in troubleshooting and resolving the issue of a 2-stroke outboard engine that won’t reach full RPM. It works great! Added 7 mph & about 800 rpms. That is why with outboard engines in high-use applications, 2-stroke engines are much more economical. Lightweight Designs TwoStroke outboards spool up serious power, and their lightweight designs improve efficiency and speed for capable all-around performance. Are you wondering, “Why my outboard will not throttle up?” This post clears up the mystery and identifies the exact problems. However, two and four stroke engines with ECU's may vary engine timing automatically. Mar 20, 2025 · Want to boost your outboard motor’s speed and efficiency? Learn how to tune your engine for maximum horsepower, better fuel economy, and smoother acceleration! A quick video on modifying a little 5hp two stroke outboard. Increasing Horsepower of Mercury 2+2 115-HP - Moderated Discussion AreasHop to: Nov 10, 2004 · Re: make a 50hp out of a 40hp nope, bore and stroke are all the same on merc 40/50/60. Dec 16, 2010 · On older 2 stroke engines with 2 or 3 engine HP ratings in the same model, it was as simple as drilling out the restrictor plate between the Carburetor and engine on some outboards. Apr 6, 2022 · In another thread a forum member mentioned having a 9. Compression powers the engine that, in turn, powers your boat Apr 28, 2025 · We reviewed the best outboard motors from Mercury, Yamaha, and more. Tips to help you to adjust the idle in your outboard #boating #yamaha #outboardThis is one of the most popular tools for idle https://amzn. How to adjust idle speed 1998 1999 2000 2001 2002 2003 Yamaha 50 horsepower 2-stroke, 3-cylinder outboard engine with models C50TLRW 50EJRX C50TLRX 50TLRY 50 I was ordering a new carb for my 5hp four stroke outboard and the dealer had a 6hp carb available but needed to order out for a 5hp. 3-3. (sort of) Search for Mercury outboard performance. Feb 15, 2006 · in nb we do alot of small engine outboard racing. the only parts that differ on a 40 and 50 is the jet size and the forty has a reed stop. Choosing the right spark plugs can enhance fuel efficiency, increase power output, and contribute to smoother engine operation. If the ECU follows a fixed View and Download Johnson 2 Stroke 40 HORSEPOWER operator's manual online. Oct 23, 2019 · yahama 2 stroke from 4 to 5 hp Discussion in ' Outboards ' started by patru alexandru, Oct 23, 2019. How can I make my HP outboard faster? 2 STROKE OUTBOARD BETTER PERFORMANCE MORE POWER, How To Increase Horsepower, How to Make Your Boat Go Faster? How to increase horsepower to boat motor? Apr 17, 2002 · I just bought a Mercury 6 HP engine S/N 0D192887, Model Number 1008211ND. Keep reading! Engine Parts - ECU Upgrades and Tuning ECU Upgrades and Tuning We would like to show you a description here but the site won’t allow us. May 20, 2024 · Optimizing your 50 HP Mercury 2-stroke engine with the perfect propeller is crucial for achieving optimal performance on the water. We have 2 separate categories, performance and semi-performance. 5hp [ Chinese copy of Tohatsu ] 2 stroke from 2. Find the right outboard engine for your boating needs. If you do a Sep 19, 2017 · The Wave to Wave Outboard buyers guide is focused on performance orientated outboards from the midsize horsepower range to the high horsepower range. Mar 21, 2023 · Then, turn the knob clockwise to increase the idle speed or counterclockwise to decrease it. Mar 26, 2025 · The Mercury V6 two-stroke outboards (2. Putting the handles in neutral and in WOT are going to open up the throttle plates and allow the engine to get more air. Also applies to Tohatsu outboards and Tohatsu made Mariner, Nissan Jun 25, 2024 · 2-stroke engines are much less expensive to maintain because not oil changes and replacing fuel filters is necessary. And any issue with these aspects can cause problems in the engine – causing problems in the outboard. All of these are impractical on water cooled outboard. Jan 25, 2003 · Re: Can you modify outboards to increase HP like you can any other engine? Try www. These instructions are based on factory idle adjustment procedures. View and Download Mercury 150 manual online. to/42aJXUI Feb 26, 2010 · My experience of improving performance of two stroke engines is major gains are made by improving fuel and air flow, increasing RPM and tuning the exhaust scavenging. 2L and Merc's 200 4. 2) In some states a title is not required for outboard motors under 10 hp. The 150S (XP/GT) models used the 1 5/16" throat 175 carbs. Also for: 200. Jul 23, 2007 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. For a general number scale for compression. Mar 23, 2009 · I was wondering if any of you knew a way that I could optimize the horsepower I get out of a four-stroke 115 Yamaha. Jan 25, 2010 · Install a 84 model tuner and a set of 50 hp carbs. As a former technician and service rep for Yamaha, Wayne branched out on his own to start a business offering high performance products specifically for Yamaha outboards. When a part number differs between the two engines, get the one for the 50. The only thing I can think of is larger carbs or more timing. 5Hp depending on the year and model ). and nothing! NO DIFFERENCE AT ALL. On say a 250 HP Yamaha four-stroke. How can I make my HP outboard faster? 2 STROKE OUTBOARD BETTER PERFORMANCE MORE POWER, How To Increase Horsepower, How to Make Your Boat Go Faster? How to increase horsepower to boat motor? The outboard motor is suitable for a variety of small watercraft, such as fishing boats, dinghies, and inflatable boats. We would like to show you a description here but the site won’t allow us. These larger-throated carbs permit more air and more fuel. In this section, we’ll dive into the importance of spark plug replacement, fuel system cleaning, and Nov 3, 2024 · 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. Aug 10, 2024 · Mercury 2 Stroke Outboard Maintenance Maintaining your Mercury 2 Stroke Outboard is crucial to ensure it runs smoothly and efficiently. Mar 8, 2006 · I have a 1990 90 hp that I plan to freshen up (piston, rings, bore if needed) and was woundering if anyone has any tips to get any bonus power out of the engine with out dropping big money. Aug 28, 2005 · Re: Increasing HP on 2 stroke Nissan 8 Actually I have two NS8B engines because a friend recently sold me his to use as a backup. Remember that carburetor adjustment is an iterative process—small changes can make significant differences in performance. 5Hp Mercury outboard (built by Tohatsu) to 3. Here are ten tips to optimize performance for this type of engine: • Propeller Selection: Choose a high-performance propeller that matches your specific performance goals and boat configuration. Theres guys that run these engines up to 10,000 RPM, and are putting out a lot of power. With this in mind manufacturers make 9. 5 to 50hp, there are solutions for powering a wide range of boats and applications. Bore-out the heads? Any other ideas? Apr 2, 2024 · When it comes to optimizing the performance of your 2-stroke outboard engine, selecting the best spark plugs is essential. 9hp 2 stroke Mercury,. The performance category focuses on hardcore outboards that are race capable yet might be accessible to consumers. Oct 25, 2023 · If you want to maximize the power output of your outboard motor, there are several tips and techniques you can employ. In old, non-ECU, carbed engines that would be an accurate statement. 9-HP engine in order to increase its horsepower to 15-HP: if you want a 15-HP engine it would be simpler to just buy a 15-HP engine. Jun 14, 2025 · In conclusion, the ability to reach full RPM is paramount for the optimal performance and efficiency of a 2-stroke outboard engine. What would I have to do to give the engine the extra 25hp. 9-HP to 15-HP Postby jimh » Thu May 30, 2019 2:02 pm Regarding changing the carburetor in the 9. Aug 13, 2017 · How to adjust idle on a Mercury outboard engine refers to the process of adjusting idle speed on a carburetor. The small gain in horse power will usually cause premature failure of your alloy piston. This is very easy for the factory In order for boaters to have the highest possible horsepower rating while staying under the limit manufacturers produce a 9. Apr 21, 2010 · Can anyone give me any info on taking a 2000-2005 Mercury 25 hp 2 stroke and making some engine modifications for more HP? Looking for 5-10 more HP. 9-HP engine into a 15-HP engine may require more than just changing the carburetor. 0L, 2. One of the most critical components influencing horsepower is the Mercury V6 tuner pipe length. Ignition timing dictates when the spark plug fires relative to the piston’s position in the cylinder, impacting power How to adjust the idle on many mercury outboards Jan 23, 2013 · Your only options to increase hp on that 2-cyl 2-stroke are to go and see the machine shop for mods to the block, head, and pistons and you could switch to aftermarket reeds. it seems it is easier to get more hp out of the johnson motors. 70 hp carbs will bolt right up but motor needsto be on ultra light rig for them. How to adjust idle screws on Mercury 75, 90, 100, 115 and 125 horsepower outboard motors. That extra re-sale value might make up for some of the up-front cost of upgrading to a 115 HP engine today. He suggested buying the 6hp unit, stating that it would fit and 10 ways to gain power in a 2 stroke engine for free! (or very cheap) You can buy alot of "go fast parts" and you can nerd out on complicated two stroke techno We would like to show you a description here but the site won’t allow us. The serial number of the primary engine is 3B2-1 65343 and the other one (which needs new seals) is 3B2-1 25219 Short video how to increase horsepower on Tohatsu built Merc/Mariner/Nissan/Tohatsu 2. 8/9. 5hp Apr 12, 2017 · Small outboard motors are used to take fishermen to their fishing sites and to move small sailboats into and away from docking areas. Jun 14, 2025 · When your 2-stroke outboard engine falls short of its RPM capabilities, it’s not just an inconvenience; it can be a significant letdown. Because state and federal laws distinguish between motors that have less than 10 horsepower and more than 10 horsepower, most companies make an outboard motor in both size ranges. Jun 8, 2024 · What are the top performance upgrades for Yamaha 2-stroke outboard engines? Upgrades for Yamaha 2-stroke outboards often include high-performance carburetors and aftermarket reeds. 039" to . Jun 16, 2024 · Tuning a 2-stroke outboard engine for high performance requires expertise and careful adjustments due to its specialized nature. 9, and 15 HP models were quite similar. Johnson 40 Hp Outboard Idle Adjustment If you have a Johnson 40 hp outboard engine, you may need to adjust the idle speed from time to time. 6L can be easily tuned for higher outputs. This is very easy for the factory We would like to show you a description here but the site won’t allow us. Jan 29, 2009 · Re: trying to increase power from yamaha 25hp Dude, there is a guy on another forum putting two 235's on a 19' boat, so who am I to say the 40 will be too much! The consensus on this forum seems to be toward safety, using the manufacturers rated horsepower as your maximum. Theidle speed is the speed at which the engine runs when it is not under load. Why do people do this? We would like to show you a description here but the site won’t allow us. Also liability and insurance issues. They can answer questions for any Yamaha outboard model or horsepower. Did same thing with a 9. One of the most crucial tuning elements is setting your maximum ignition timing advance. These techniques work on most two stroke outboards. Therefore higher octane fuel can indeed allow more spark advance which can provide a bit more power. May 11, 2025 · How to perform a compression test on legacy 2-stroke outboards like Mercury 2. There are issues of safety for yourself and others if using a larger motor. screamandfly. 9 2 stroke Johnson a 15hp, you put a 15hp carb on it. Jan 12, 2007 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. If you do a Jul 23, 2007 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Starting an outboard without proper cooling water circulating is tantamount to disaster. If you May 14, 2006 · Re: High performance modifications for a 25hp Mercury Upon the excellent assistance of "Myoutboards" the conclusion I have come to is that even if I increase the horsepower on the top end of the engine it can not be converted to the prop. Mar 19, 2025 · Want more power from your outboard motor? Learn expert tuning techniques, propeller upgrades, ECU remapping, and fuel tips to boost speed and performance! With patience, attention to detail, and the right tools, you can achieve optimal performance, improved fuel economy, and enhanced reliability from your outboard motor. Finding the best prop for your 50 HP Mercury 2-stroke engine can enhance speed, efficiency, and overall boating experience. 2 Stroke, R, RL. I have purchased a late model (2003) Mercury 4 hp two stroke outboard. I know many of the 9. I know when it comes to small outboards, it can't be done with Mercury's. It’s like taking care of a high-performance machine – you need to regularly check and replace its components to avoid problems and prolong its lifespan. Oct 9, 2010 · Re: Higher octane for outboards One must be careful about saying higher octane fuel "does nothing" for power. 5L, Johnson, Yamaha, and Evinrude 2-stroke outboards. How to Convert a Merc 75 HP 2-Stroke to 90 HP - Moderated Discussion Areas Hop to: How to adjust idle speed 1999 2000 2001 2002 2003 Yamaha 90 horsepower 2-stroke, 3-cylinder outboard engine with models 90TJRX 90TLRX C90TLRX 90TJRY 90TLRY C How to convert a 2 stroke 2. To make a 9. And with outboards ranging from 2. 056" Nov 10, 2023 · Learn how to boost your boat's performance by increasing the compression on your 2-stroke outboard engine. Is it as simple as increasing the main jet diameter from . Here are some important guidelines for correctly setting up and preserving an outboard’s potential life. In this comprehensive guide, we will explore the top recommendations for the best spark plugs for 2 stroke outboard engines, providing you with Mar 30, 2006 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Oct 9, 2015 · Increasing 9. What can I do to increase the horsepower output? I believe the 6, 8, 9. I know that on the same year Mercury made this outboard in a 115hp version. Mercury/Johnson/Evinrude - Finding the sweet spot on Boat motor idle Jun 23, 2016 · You were searching wrong. 5L Merc outboard powerheads. 5hp and Parsun 2. I am surprised you have a problem with 5hp on a small Jul 23, 2022 · That includes – low compression in the engine. Depending on year model. 150 outboard motor pdf manual download. Maybe search around some more for an 18HP 2 stroke? HydroTec Marine opened it's doors in 1989, when founder Wayne Worthy saw an untouched market in Yamaha outboard high performance products. The reason is, an outboard gas engine needs fuel, air, spark, unobstructed exhaust, and compression in the exact required amount. In this article, we will explore some of the most effective ways to increase the power of your outboard motor. 9 engines are downrated from higher hp outboards, but uprating them back to Jun 2, 2025 · When your outboard will not throttle up, there’s plenty you can do to fix the most common issues and improve performance once and for all. 5 to 3. Aug 2, 2010 · Re: Changing jets to make more HP Yours is a base 150 model. The Aug 9, 2023 · Evolution of Performance Outboards There was a time many years ago where boaters who craved speed had to make some significant compromises to really go fast. . I have used octane boosters. Their full throttle RPM range was quite a bit higher than the average consumer outboards of the day, and they often used light-weight cowling with little to no foam Dec 8, 2006 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. The capacity and weight is identical to the equivalent 5hp model and i think i read somewhere that the 4hp can be uprated to 5hp quite easily. First, high performance outboards in their 2-Stroke infancy were loud. Oct 21, 2015 · And consider that down the road if you ever sell your boat, having an OEM 115 HP engine should yield higher re-sale value than a 90 HP outboard engine that has been retro-fitted and modifed to reach 115 HP. 3Hp (or 3. 4L, and 2. Then four-strokes are going to be somewhere between 150-210 PSI! This is where the throttle position comes in. Mar 5, 2020 · A typical two-stroke or four-stroke outboard engine should provide 1,500 hours of run time. Jul 18, 2022 · i have a 1999 yamaha 50hp autolube 3 cylinder engine. Feb 17, 2009 · In 2000, while shopping for a new 40 hp outboard, I opted to go with Mercury. 2 Stroke 40 HORSEPOWER outboard motor pdf manual download. May 13, 2007 · I have a 2003 90hp oil injected 2 stroke outboard. Of course you could increase exhaust area, finger port,mill head. I have heard in the past of guys reprogramming a chip in their engine in order to optimize horsepower. Mar 9, 2020 · The option to tune a 200hp 4t engine to 300hp can save you $5k or more vs. Your 240 is basically the same as any of the 2. Both Yamaha's 200 4. Consider factors such as diameter, pitch, and material to maximize Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Two-stroke engines should be somewhere between 100-120 PSI per cylinder. iwas just wondering if anyone has any tips on how to get more hp out of my 20hp mercury. Performing a compression test on a legacy 2-stroke outboard is one of the best ways to diagnose internal engine health. To turn the 9. fbrsq6b xbcueg4z tl 5qrgq ytt fnbum zo5o6 wri wkvh lov

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