Question about 2004 Yamaha WR 250 F

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Exhaust My bike keeps filling the exhaust up with fuel and also holds back at about 60mph. Can some one help?

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Sounds like your not firing on all cylinders . If you are getting gas in the exhaust then the cylinder would not be firing for some reason. That would also cause top speed to be limited.

Posted on Nov 10, 2008

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Loss of power after upgrading exhaust

I'd say the loss of power is due to low back pressure, motorcycle engines especially 2stroke rely on back pressure for performance, backfiring may be due to unburnt fuel igniting in the exhaust or your fuel balance is too rich, hope that helped!

Dec 29, 2012 | 2011 Aprilia SR 50 R Factory

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Hello i have a aprillia sr50 and i brought it from brand new i ran the bike in for 300 miles and then i fully de-restricted the bike and placed a de-restricted exhaust on and a bigger jet and had the...

That looks like a REED VALVE leak.
If your 2 stroke kept coming out from the carb air intake and as you say that sometimes a back fire in the exhaust.

Check these....
  • Reed valve
  • Crank oil seal ( there might be air leak in the block )
  • Exhaust pipe ( might be already blocked )

Hope that helps you out!

Aug 29, 2011 | 2011 Aprilia SR 50 R Factory

3 Answers

My new 883 superlow (1000 km) engine is intermittently misfiring (I think) there are no backfiring noise. only a momemtory interruption and jerking, especially on slight incline and certain engine speed....

I wished I could help but my expertise is in the older model bikes without the ECM on them. I don't think the lower octane fuel is the problem as it is still within the recommended octane range. I would hazard to make a guess that for some reason, the fuel air mixture is not correct. However, usually when an engine is running lean, it will spit back or cough through the carb. No backfiring through the exhaust. If it does backfire through the exhaust, you may have an ignition problem. Since your bike is a 2011 and obviously still under warranty, I'd take it back to the dealer and explain the problem to them. If you do not wish to take it to the dealer, or any other dealer in the area, try to find a performance oriented shop in your area that is equipped with a dynometer and an exhaust gas analyzer. Have them run the bike up while monitoring the exhaust gas. This wil tell them what the fuel-air mixture is at any given RPM. They can then tell you exactly what you need to do.

Good Luck

Jul 06, 2011 | 2011 Harley Davidson XL 883L Sportster 883...

1 Answer


What is causing the fouling? Engine oil? On a two cycle dirt bike, the fouling can be caused by excessive oil in fuel mix. I believe 50 to 1 is the correct ratio yet you may want to cut back, a little at a time, on the oil or run hotter fuel. The exhaust system will also accumulate enough oil sludge to impede the exhaust flow causing poor performance and plug fouling. A two cycle must breath freely to keep itself internally clean. Air cleaner to exhaust. Proper fuel mix should have little , very little. Good Luckand hopefully this helps you.

Dec 27, 2010 | 2003 Yamaha YZ 125

1 Answer

Gas is spitting out of the exhaust

Check your oil. If it is too full , change it. Occasionally the Honda's of that time would have the float stick and fill the engine with gas. There may actually be nothing wrong with your cycle , new bikes did this. If gas filled the cylinder and went into the exhaust you probably have a stuck float. If the problem happens again you may have to disassemble and clean the carburetors , replacing the float needles at that time. One good way to keep your oil from filling with gas is to always turn off your gas at the fuel petcock after riding. Be sure to check your air filter for gas/oil saturation and be sure to pull the plugs on your pollution tubes under the air box to drain the blow by.

Oct 23, 2010 | 1984 Honda VT 500 C

1 Answer

Hello, Two of my friends have E-Glides with stock pipes, both have a stumble at the 50-60mph range. Do I need to put a bolt in the end of the main exhaust pipe to get rid of that stumble? Thanks, Ole...

If the stock mufflers are on the bikes, you should have enough backpressure to eliminate the stumble. That's what the bolt does, produce just a bit of back pressure on the exhaust system. Now, if the mufflers have been gutted, the bolts may help. It doesn't cost that much, try it.

Good Luck

Sep 16, 2010 | 1993 Harley Davidson FXR Super Glide

2 Answers

Just changed pipes and bike is back fireing

you need to remove your pair valve ,there is a guy called moccosin mike that sales them for i think 21 bucks,the pair valve is deff. whats causing the back fire

May 24, 2010 | 2003 Suzuki VL 800 Volusia

1 Answer

Our Moto Guzi Nevada is surging all the time and has been back to a dealer several times and they cant find out what it wrong with it. · Inspect for running rough etc + put on axone scan tool + test...

I am not a Moto Guzi mechanic but in the world of Japanese bikes the problem would be trash in the carb partially blocking the main jet and / or internal fuel circuits. Tighten all fittings, carb to manifold as air leaks could be contributing to the problem. If your bike has fuel injection, have the fuel pump checked. Be sure the gas tank venting is not plugged whether carb or injection. Check and clean the filter screens on the pickup tubes inside the gas tank. Be certain the exhaust pipes are clear of obstructions. An internal collapse inside an exhaust pipe can restrict air flow. The bike can not run properly if it can't get rid of burned gasses. Remove the exhaust pipes briefly to eliminate the exhaust system as a problem. I guess I should mention the obvious, how clean is the air filter? Bikes gotta breathe in and out too. If these ideas don't help, just re-post the problem and perhaps someone else has an idea. Best wishes.

Jan 16, 2010 | 2008 Moto Guzzi Nevada Classic 750

1 Answer


Hey Doug,
I would first suspect a clogged fuel filter, then ignition components and air pathway obstructions from filter to exhaust.
Sounds like the bike wants to run and does run...when it gets what it needs.
If it has a carb, check the float bowl for crud that can clog the jets. You may need to replace fuel line, but not likely.

Oct 12, 2009 | 2005 Yamaha Road Star Warrior

2 Answers

I Have a 2005 rmz 450 and the front pipe on the exhaust glows red hot really quickly

thats very very strange seems like your not getting the coolant there is ther coolant in the system and is there enough oil in the bottom also check oil filter replace if necessary get back to me

Sep 22, 2009 | 2005 Suzuki RM-Z 450

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