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  1. #1

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    What causes exhaust backfires?

    Well Ive been searching for the answer for this for a while and have not been able to find a straight answer, but what causes exhaust backfires? Is it a timing issue? Isnt it when a cylinder fires while the piston is at a position at the bottom of it stroke, and the spark ignites not only the cylinder, but any fumes/fuel that are in the exhaust components?


  2. #2
    caliburn's Avatar
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    Bad plugs or fowling can cause it as well

  3. #3

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    Quote Originally Posted by caliburn View Post
    Bad plugs or fowling can cause it as well
    What exactly is fowling? Ive heard of it before but arent quite sure what it is / what causes it.

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    1-877-JET-PROS BigBoost's Avatar
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    Quote Originally Posted by gordo1287 View Post
    Well Ive been searching for the answer for this for a while and have not been able to find a straight answer, but what causes exhaust backfires? Is it a timing issue? Isnt it when a cylinder fires while the piston is at a position at the bottom of it stroke, and the spark ignites not only the cylinder, but any fumes/fuel that are in the exhaust components?
    Bad coils bad plugs twisted cranks, bad reeds bad carbs lean, timing off bad or weak stators.

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  6. #5

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    Quote Originally Posted by BigBoost View Post
    Quote Originally Posted by gordo1287 View Post
    Well Ive been searching for the answer for this for a while and have not been able to find a straight answer, but what causes exhaust backfires? Is it a timing issue? Isnt it when a cylinder fires while the piston is at a position at the bottom of it stroke, and the spark ignites not only the cylinder, but any fumes/fuel that are in the exhaust components?
    Bad coils bad plugs twisted cranks, bad reeds bad carbs lean, timing off bad or weak stators.
    Well i know that my ski doesnt have the stator & CDI upgrade yet, sounds like thats what could be causing this.

  7. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by gordo1287 View Post
    Quote Originally Posted by caliburn View Post
    Bad plugs or fowling can cause it as well
    What exactly is fowling? Ive heard of it before but arent quite sure what it is / what causes it.
    Fowling is when a bird goes through the engine

    Spark plug fouling is when the tip of the spark plug is contaminated with oil, carbon accumulation or combustion deposits. A fouled spark plug may not spark properly, or at all.

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  9. #7
    I transcend race Hombre! TBone14's Avatar
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    Have you stepped through all of the diagnostics from your other thread yet??? Ie inspected reeds, carbs, etc. ? Have you checked crank phase? Stator resistance?

    Speculation will do nothing but cost you money

  10. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by gordo1287 View Post
    Quote Originally Posted by BigBoost View Post
    Quote Originally Posted by gordo1287 View Post
    Well Ive been searching for the answer for this for a while and have not been able to find a straight answer, but what causes exhaust backfires? Is it a timing issue? Isnt it when a cylinder fires while the piston is at a position at the bottom of it stroke, and the spark ignites not only the cylinder, but any fumes/fuel that are in the exhaust components?
    Bad coils bad plugs twisted cranks, bad reeds bad carbs lean, timing off bad or weak stators.
    Well i know that my ski doesnt have the stator & CDI upgrade yet, sounds like thats what could be causing this.
    What ski are you asking about?

  11. #9

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    It's a 97 sl1050, I checked the crank phase and it was fine, no problems there. Tonight ill go get e multimeter and check the stator resistance.. Any tips to doing this?

  12. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by gordo1287 View Post
    It's a 97 sl1050, I checked the crank phase and it was fine, no problems there. Tonight ill go get e multimeter and check the stator resistance.. Any tips to doing this?
    My signature links should include some guides regarding stator checking.

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