Backfire bad

Discussion in 'Carburetor' started by BobdylAN123, Nov 29, 2019.

  1. BobdylAN123

    BobdylAN123 New Member

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    Im dylan bought a 91 blaster 5 months ago ran fine stator went out replaced it the coil, spark plug wire, flywheel key, cleaned carb, new plug.. After i replaced the key it backfired bad. Got it worked out i thought got it running good went to hits some trail stopped to take a break bam started again.. Tried pulling it off it was bogging down woudnt run.

    Help please about had enough i dont think it like me
     
  2. Awk08

    Awk08 Administrator Staff Member Technician

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    Flywheel key and cracked/broken reeds are the 2 common causes of backfires.

    when you replaced the flywheel key did you lap the flywheel and crank tapers together ?
    torque flywheel nut to specs ?

    the taper fit is what holds the flywheel tight, the key just locates it for timing, if the taper needs attention it could shear again instantly even with a new key.
    flywheel lapping.....

    https://www.blasterforum.com/threads/flywheel-to-crank-lapping-vid.58463/
     

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