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Thread: 350x backfire

  1. #1
    ovhonda1's Avatar
    ovhonda1 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Question 350x backfire

    Anybody with a 350x ever have popping (backfiring) after the engine has been revved high? When I let off of the throttle after ing it the engine backfires several times. The bike runs strong, but I was curious if this is a common trait.

  2. #2
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    Its common on alot of ATVs, especially if you go down hill and let off on the throttle.
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  3. #3
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    Believe it or not -Exhaust systems are not for noise control -power enhancement- Or just to look cool---Its a Flame arrestor for backfires (Spark Arrestor)
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  4. #4
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    If you ever watch drag racing on TV- The flames that come from the exhaust are completely normal
    Buy American! Unless your only option is a HARLEY.

    A customer walked in to my shop and Impatiently stated "My car doesnt start, Whats the problem?"I responded with a smile-"Yep that sounds like your problem alright"----

  5. #5
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    I know that if you have a leaky exhaust gasket or a lean fuel condition that it will cause the back to backfire when you rev the engine up and let off the throttle real quick. Often if you change to a different air filter or exhaust the engine will begin to backfire alot. It usually means you have to rejet your carb.

  6. #6
    Join Date
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    Andale, KS
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    My 350X only does it when it is revved extremely high in a high gear. Other than that it runs smooth.
    Current Rides:
    1986 350X-My play bike!
    1985 250R-My dune baby!

    Past Rides:
    1983 250R

  7. #7
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    Spruce Head Island, Maine
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    its excess gas igniting in the exhaust i believe
    1983 Honda ATC 200x-shes a beater

    Past Rides:
    1982 ATC Big Red 200e (miss it more than i thought i would)
    1985 200x rode it for about a mile

  8. #8
    ovhonda1's Avatar
    ovhonda1 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    thanks for the replies everybody.

  9. #9
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    Yep, excess gas. It can be caused by too lean an idle mixture.

  10. #10
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    yepp, my 200x also does it when i got her pinned in 5th and let off, it gives off a pop or 2

  11. #11
    breastman569 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    anyone ever tell you that you timing is off just a little check it and bet it will solve everything. my 200X was doing the same thing and sure enough that was it. check that first.

  12. #12
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    Every 4 stroke I've ever owned (xl80s, xr100r, lt185) always backfired when using engine braking going down a hill.

  13. #13
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    My 350X did the same thing when I had the cobra muffler on it. After switching over to the 450R muffler it has stopped. Are you running stock exhaust / muffer, or aftermarket?
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  14. #14
    Go up one size on your idle jet and it should quit. Your just lean a little.
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