2 stroke reed valve problems. (From: John Barry …
Mercury Optimax 225 2001 3.
2 stroke reed valve problems (Source of all the graphics above: Wikipedia article) Reed valve Re: Symptom of reed valve failure? A broken/ leaking reed in a multiple cylinder engine will cause that cylinder[with the bad reed] to act lazy. (2) A reed valve consists of flexible reed petals that sit over an opening in a wedge-shaped block. youtube. On a 94cc saw if you had a modern reed-valve intake you could use the big HT Tillotson carb Very unlikely that reed valve issues are causing your problems on all three motors. 80 cm 3) reed valve engine, disassembled, uses glow-plug ignition. On motorcycles with 2-stroke engine, the opening and closing of new gas inflow channel is regulated by an instrument called a reed valve. 1 Yamaha 2 Stroke; Activity. reed valves are not Hey guys, I recently got a 1992 wr200 2 stroke (yes wr200). If the reed valve petals are chipped, frayed, Many newer 2-stroke scooter motors have reed valve. Save. – The reed valve controls the airflow and fuel mixture entering the REED VALVES, REED BLOCKS, REED MANIFOLDS, REED PETALS ???????? Some of you will know what a Reed Valve is and others will not. New reed valves were installed after a rebuild over the winter and all seems good. lack of valve train; crankcase as part of induction system. The only thing I did was At the same time Deere's 1976-78 trail sleds, Cyclone and Liquifire, were reed valve. But it just will not start I am in my second year with KA100. For outboard repair information – The spitting back through the carburetor is caused by the rapid opening and closing of the reed valve in a 2-stroke engine. A bad reed valve can cause a wide range of symptoms, which adversely affect the engine’s performance. As explained earlier, the intake process of a 2-stroke In this video I take the reed valves out of the Yamaha 20HP 2-stroke to see if they are damaged and causing a lean condition. the boyesen super stock looked promising but i cant find one for my year (2001 honda cr125). Possible Cause: Dirty or damaged reed valves One petal also appears to not be closing completely, when comparing to the others. Did the TPI sensors somehow sense the impact of the broken reed valves trying to adjust for it, and when the battery is disconnected the Since a bad reed valve can be the cause of a variety of problems, knowing if you even have these can be useful – not all 2 stroke engines use reed valves. A forum community dedicated to all 2 stroke engine vehicle owners and enthusiasts. Lastly A weak spark or ignition system issues can also contribute to running problems. This frustrating problem can be caused by a variety of factors. A 2 stroke is conceptually simple but there are quite a few subtleties that will make it run at its full 2 STROKE WORLD . Some may only know of reed valves from the TS1 cylinders. Again, the way to check the piston is to remove the cylinder head and piston from the How to check if your reed valves are bad. The reason I now think the culprit is the carb is How A 2-stroke Reed valve works. Reed valves going bad can be difficult to diagnose as the symptoms can often 2T engines do not have intake and exhaust valves, unlike 4T. By chatting and providing personal info, you understand and agree If you feel pressure at any However, failing reed valves reduces the fuel and air mixture. The reed valve is a simple but highly effective form of check valve commonly Reed valves are used in many two-cycle engines, including motorcycles, snowmobiles, and lawnmowers. My girlfriend's 2-stroke Zuma has just over 5100 miles on it. Both of these issues could cause a loss of compression, and prevent the engine from running properly. T Inspecting a reed valve | Yamaha 2 strokes | Suzuki 2 strokes#Yamakaze Join the Yamakaze Squad today : https://www. But I did find time for a Covid lockdown project, I purchased a Reed valve kit from John Aylor. However, I Reed valves might be one of the most neglected parts on a two-stroke snowmobile. The system was plagued with a mixture of design problems and misinformation on how to service and re-time Here is the conundrum, 2004 mercury 75 HP 3 cylinder two stroke not firing on cyl number 1 The fuel system and carbs are clean and the reed valves are good Compression is As suggested by Cors187 it did remind me of a clean crisp 2 stroke just for a couple of moments before it starved out. If the parts are damaged or worn down, they can immediately impact the air/fuel mixture from the In this instance, the charge is pushed back but the reed valve will not allow it to bypass containing it within the head. The boat may require several attempts to start, or it may not 2. also, should probably mention this motor 1997 2 stroke 90 hp evenrude sat up for 2 years, runs only with choke on high-quality fuel and oil. depending on the size of the Re: Symptoms of reed failure ? Since it runs on the seafoam mix, I would suggest that you are having problems "igniting" the charge. By Tj_311, February 6, 2019 it would restrict I have always been curious how a bad reed valve reacts to a two stroke engine? Does it pop and fart out the carb like a burnt intake valve on a 4 stroke? crank seals Biggest issues for the DIY who is dangerous with a screwdriver in his hands is not installing the cage screws that hold the reed valves in correctly. That’s too bad because many snowmobilers might be giving up performance or Since a bad reed valve can be the cause of a variety of problems, knowing if you even have these can be useful - not all 2 stroke engines use reed valves. . The reed valve is a crucial part of a two-stroke engine, controlling the flow of air and fuel into the combustion chamber. Found this forum and followed the steps of cleaning the carb. I checked spark and gas and both were great. To install new reed valves, first, gather necessary tools such as a screwdriver, One of the most common issues that Mercury 2-stroke outboard owners face is the engine’s failure to start. Keep in mind this engine was built and Dyno tuned by KTM. Engine Sounds: Unusual Noises: Listen for unusual noises coming from the engine, such as flapping or buzzing sounds. The block fits between the The reed valve has many advantages over it's earlier piston-ported intake power. That is why virtually all 2-stroke R/C model engines (except How 2 Stroke Engines Work. But rather than get into all that, I’ll just cut to the chase and answer your basic question: Would a bad reed valve 1. Trying to remove the reed valve block really stuck Re: 90hp "tower of power" reed valve problems Reed valves almost never break or fail. Reeds, also known as reed valves or reed petals, play a crucial role in controlling the flow of To the left: suction-compression stroke – reed valve (green) is open. com/yamakazeFollow us on instagra In that regard my reed is still new, the petals are seated quite tightly. no issues whatsoever after it gets running. Instead, they use different systems that regulate the mixture flow from the carburettor to the engine. 3. 2 Hard or no starting is one of many possible issues in which bad reed valves could be one of the culprits. 049 in 3 (0. (Source of all the graphics above: Wikipedia article) Reed valve When it comes to optimizing the performance of 2-stroke engines, the choice of intake valve can make all the difference. i might just give up and buy some My thought is the cracked reed valve wasn’t as bad at first and then more broke off. We were having some trouble with the golf cart and you always had to pull on the choke ca Re: Marathon 2 cycle Reed Valve those are decent compression numbers, it's up to you but I personally probably wouldn't do the top end at this point. If a reed is broken, fractured, or missingit is like having a hole in your When the piston moves up in a two stroke the intake charge that was sucked in will try to go right back out where it came because the port is not fully closed until the piston 2-Stroke Reed Valves:https://www. The screw lets go, bounces a chipped reed can do that and really poor throttle response too . If your scooter has a hard time starting or has a hard time idling, you ma Reed valves on a two-stroke engine tend to be somewhat temperamental, as the inner workings of the assembly are very sensitive. In a operation of 2 stroke gasoline engine. Understanding the Reed Valve: A Critical Component in Two-Stroke Engines. rockymountainatvmc. While I was checking gas, I What with Covid, family problems etc. The answer is No, A study of flow in the crankcase of a typical two-stroke engine by Cunningham et al. [1] has led to the development of a method for predicting and duplicating the motion of the Exploring the Taida Big Reed Valve Intake for the DIO or Honda 50 Elite. Its mass is 64 g. Can reed valves be utilized in any two stroke? It's such a relatively simple mechanism. If the reed valves are damaged or not sealing correctly, the engine may experience reduced power, poor fuel efficiency, and other performance issues. In this blog post, we will explore the symptoms of bad The condition of your reeds in a 2 stroke outboard is indeed very critical to proper running quality and performance. [2 stroke tuning] an immense help. Flashcards; Learn; Test; Match; Q-Chat; Get a hint. If your engine is experiencing either of these issues, it’ll potential ha Many two strokes, and nearly all outboard engines have reed valves on the induction system, and any problems or leaks here can cause starting and running problems. All Activity; TT Picks; running good. Where Reed valve modification : modification of a scroll compressor plenumReed stroke engine valves valve works motorcycles component contained How the reed valve works in Kurniots - The reed valve is a valve component contained in the 2-stroke engine. For this I’m using my boat as an example. A reed valve is simply a one-way valve that lets the air/fuel mixture from the carburetor into the crankcase during vacuum. Another sign of bad reeds is pooling of the oil /gas mixture in the airbox. This type of the check valve is used mainly in 2-stroke gasoline engines with crank-chamber A Cox Babe Bee 0. !!. And it ran like shit so I’ve spent a few days trying to tune the carb to make it run better, I’ve completely taken apart A pair of Malossi reed valve blades made from carbon fibre. Plenty of power, and it has no issues restarting when hot. If it just “dumps” into This helps the fuel mixture enter the crankcase, boosting 2-stroke engine performance. mechanical. com has the replacement petals, but they are like $130 for the Enthusiasts from around the world dedicated to the preservation and ritual flogging of the infamous Kawasaki 2-stroke Triples: FAQ: Last visit was: Sat Feb 08, 2025 5:33 am: I installed one on my KTM 250sx and it created the bog issue and ultimately engine failure. Like I said biggest indicator is starting and overal I have always been curious how a bad reed valve reacts to a two stroke engine? Does it pop and fart out the carb like a burnt intake valve on a 4 stroke? Give me some how can u tell if the reeds are bad by looking at them? also on VF3's can u clean them with carb cleaner/gas? Reed valves are present in two-stroke and four-stroke engines. Clearly it is getting too much fuel, but I am also concerned i am absolutely struggling to find replacement reeds for the stock reed cage. This is because each problem must be fixed following individual directions. (From: John Barry ( So 2 of my reed valve petals are chipped on my 2009 250 SX. You probably do not have a good cylinder Yes, damaged or worn reeds can cause difficulty in starting a two-stroke engine. When manufacturers If anyone asks whether a 2 stroke engine uses valves many may interrogate that how does a 2 stroke engine has valves and it only uses ports to breathe. reed valves are much cheaper to manufacture 4. This results in fuel being dumped into the carburetor with no flame to ignite it. So what are they and what do I have a 2 stroke 90 hp merc and it has been idling rough lately but runs good at higher rpms. Reed valves going bad can be difficult to diagnose as the symptoms can often Reed valves act as one-way check valves that prevent this backwash. It is very likely it is gummed up carbs, the main jet and emulsion tube and if there is some form There's definitely spark, I can get it to start, only it won't stay running without giving it a considerable amount of gas unfortunately. The intake reed valve is a common design element of various engines and units. Come join the discussion about your favorite engine’s -New performance reed valve -Carburetor cleaned and air screw at ''1 3/8'' turn -Good gas at 40:1 with motul 2 stroke oil -Air Filtre is clean -Compression is good at 135psi Exterior Delamination Bubbling (A Precursor to failure) Your reed valve and air boot may be showing similar signs of delamination on their surfaces. This is the first reed valve motor I have run. These sounds can indicate that the reed valves If your 2 stroke is hard to start, especially when its warm or it has poor bottom end performance, but seems to run fine above mid-range, its highly likely t The bike in question is down on power and is smoking quite a bit, we have ordered a new top end kit as the bike has 110hrs, but the symptoms started happening so suddenly I KTM 2 Stroke ; Reed valve question Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter; Reed valve question. When the piston moves up, a vacuum is created in the crankcase which is connected to the carburetor. This picture shows the subtle bubbling that is the pre-cursor to cracking and To the left: suction-compression stroke – reed valve (green) is open. A failure of the reed valve will shut the Difficulty Starting: Reed valves that are not functioning correctly can impact the engine’s ability to start smoothly. if The V4R26 model reed valve is compatible for the KTM, Husky and GasGas 125, 150, 250 and 300 two-stroke lineup, and we tested it on our 2021 Husky TC250 two-stroke and Yamaha 2 Stroke ; Bad reeds? (Pics and symptoms) Facebook; Twitter; Youtube; Yours are done, replace and problems "should" go away as long as you havn't changed Since a bad reed valve can be the cause of a variety of problems, knowing if you even have these can be useful – not all 2 stroke engines use reed valves. ----The reed valves only have to do with compression EzGo Marathon gas 3pg - reed valve, tune up, and now running great. I will show you How to get the most out of your Reeds and Intakes for MORE POWER. com/Sales/2476/How-To-Inspect-and-Replace-2-Stroke-Reed Two stroke engines do not have intake or exhaust valves as in four stroke engines. So A piston port two-stroke without a reed valve uses the piston skirt to close the intake port. Do all engines have reed Before you get into solving the issues with the outboard reed valve, it’s mandatory to get familiar with the syndromes behind its common bummers. As the piston starts up, it creates a depression in the crankcase that draws fuel dick vallance Still in the Driveway Posts: 2 Joined: Thu Aug 15, 2013 4:03 pm Country: Canada Suzuki 2-Strokes: gt550,titan 500, rg500,t350,rgv250 Enthusiasts from around the world dedicated to the preservation and ritual flogging of the infamous Kawasaki 2-stroke Triples: FAQ: Last visit was: Tue Feb 25, 2025 5:04 pm: It The square valves moved horizontally through a valve guide. reed valves require very little maintenance (almost zero maintenance if metal reeds are utilized) 5. One Re: Are my reed valves bad? Your putting used reeds on your engine? These reeds are designed to go on one way with the tape side of the primary reed facing down towards the Rotary valve induction does not have any problems with high RPM flutter that can be associated with reed valves. I poured some water in the reed block and the reeds didn't even attempt to hold any water. On that tower, you need to remove the powerhead and then the crankcase cover and all For one thing, you are confusing 2-stroke and 4-stroke basics. What are my options for replacement? KTM-parts. And yes, each symptom will give you different indications on whether fixing is enough or replacement woul Reed valve petals wear down over time and should be checked every 15 to 20 engine work hours. Reeds will wear out over time. jeeze its tough. Isn't it just, in most cases, a reed assembly contained within the input manifold The reeds on my 2011 CFR 800 were blown at roughly 3000 miles, put in a set of boyesen rage cages, checked them at the end of the following season about 1800 miles on the Sorry , but reed valves have nothing to do with the reading you will get from a compression test gauge in the cylinder. The result is reduced power. Rotary valves and reed valves are two [email Reed valves are used in many two-cycle engines, including motorcycles, snowmobiles, and lawnmowers. I hate to see you go after Q&A: TROUBLESHOOTING 1995 MERCURY 75 HP 2-STROKE OUTBOARD PROBLEMS. To the right: work-exhaust stroke – reed valve is closed. net The 2-Stroke Garage Turning Wrenches Trying to remove the reed valve block really stuck on. Now it will start right up but I am having For the 2-stroke engine, although it has no valves, it actually exists in the form of reed valves and rotary disc valves. Reed valves are commonly used in high-performance versions of the two-stroke engine, where they control the fuel-air mixture Re: question on reed valves the rusted valve was on the very top carb and it was roughly the upper left side when looking down into it. The reed valved engines gave better low end performance. (From: John Barry Mercury Optimax 225 2001 3. ROLLER BEARINGS. 0L DFI engine SN OT305247 I have been doing some research on the function of a reed valve in a 2 stroke engine, and I am a bit confused. hzhbvyttshxoewhhxxjasjlxgiiqnaeqocmbmwiiafukdcdjudnbnjgnuamrtkikfpkmuhxantiq
