2005 KTM 450 EXC backfiring problem

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Thread: 2005 KTM 450 EXC backfiring problem

  1. #1
    Junior Moto Bushpig's Avatar
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    2005 KTM 450 EXC backfiring problem

    Everytime I'm going down hill, slowing down or running on momentum and I'm not on the throttle, my bike is back firing like a large bore hunting rifle. Could it be because of fuel starvation or a lean air:petrol mixture.

    There doesn't seem to be a problem when I give it a wrist full though. Maybe a bit boggy at low revs but thats about it.

    I also seem to be getting some mega milage out of a tank of petrol.

    Any suggestions please chaps on what may be the cause and how to fix it

    Thanks
    Four wheels move the body, two wheels move the soul

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  3. #2
    The "Moto" wardy's Avatar
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    it sounds lean on the pilot, go up one size. and possibly raise the needle one position. make one change at a time and test so you know where you are and what works.

  4. #3
    The "Moto" kristian1ify's Avatar
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    Is it lean or rich that doesn't matter to much?

  5. #4
    King Moto
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    Quote Originally Posted by Bushpig View Post
    Everytime I'm going down hill, slowing down or running on momentum and I'm not on the throttle, my bike is back firing like a large bore hunting rifle. Could it be because of fuel starvation or a lean air:petrol mixture.

    There doesn't seem to be a problem when I give it a wrist full though. Maybe a bit boggy at low revs but thats about it.

    I also seem to be getting some mega milage out of a tank of petrol.

    Any suggestions please chaps on what may be the cause and how to fix it

    Thanks
    all my 4 stroke singles have popped and banged on the overrun

  6. #5
    Junior Moto Bushpig's Avatar
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    Quote Originally Posted by wardy View Post
    it sounds lean on the pilot, go up one size. and possibly raise the needle one position. make one change at a time and test so you know where you are and what works.
    Er...Where on the carb is the pilot and needle. Does going up one size on the pilot mean buying a new one? How do you set the needle and pilot???

    I'm a bit of a muppet when it comes to this, but if you don't ask, you don't learn!
    Four wheels move the body, two wheels move the soul

  7. #6
    The "Moto" Scuff's Avatar
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    Air leak in to the exhaust system would be the first thing i'd check ......Try sealing the manifold and exhaust can joints.

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