backfire

[camojfk]

whatever i did i made it worst. i changed the exhasut gaskets and all it does is backfire put the old ones back on and same thing.

[Dave Box]

Is your first statement still correct in that you release the accelerator and as you cruise to a halt just before you stop you backfire?

If your microswitch is set correctly the plug would stop sparking as soon as you released the throttle so I wonder if the source of the ignition is carbon in the exhaust pipe. I would be tempted to remove the exhaust pipe and go for a ride. It will be hellishly noisy but if it cures the problem then maybe the solution is to bbq the pipe as well as the muffler.

Dave

[camojfk]

no it does it all the time now,something changed. i ll take the muffler off and give that a try

[Dave Box]

Actually what I was suggesting was to remove the exhaust pipe not the muffler. You can then make sure that the gasket between the cylinder and the pipe is OK
Dave

[camojfk]

the spark plug was covered in carbon. took the pipe off and all it did was shoot flames out

[Dave Box]

It will shoot flames out as the exhaust port opens before combustion is complete. This is why if the pipe has a hot spot or the gasket is broken or if there is an inordinate amount of carbon in there it will backfire. So with the pipe removed did it backfire?
Dave

[camojfk]

i changed the carb thinking that would help, and it did to some point. i bent the mirco swilcth. i ajusted the bolt all the way in and bent the tab untill i got it where i needed it so the spark stays longer after i release the pedal. it seems to be working much better



new carb @ everythingcarts 99.99 free shipping and no tax

[racin161]

Hay Evansville Il. i'm over here in Lebanon Il. was just looking at you photos and wondered if your throttle cable is secured to the bracket jam nut each side.Just a thought but if the cable is moving in and out you could be chasing your problem. DON'T KNOW