backfire

[cmatthew]

123 backfires everytime i shut her down just before she goes out. sometimes after runnin her long periods she will backfire two maybe three time at the most. ????

[JayBrd]

My freind's 123 and 129 both do that. I have a off topic that always does it. If it runs fine otherwise, it's just excess fuel in the muffler from shutting down.
My CCO does it only when I run out the fuel lines when I plan on parking it for more than a few weeks..

[ACecil]

I hear ya, Jay. My 100 was backfiring, when I ran it out of gas the other day hauling leaves...lol.

[_DX3_]

Do you let it idle down at low idle for about a minute or two before shutting it off? If not try that. Even my 128 will do that if I just shut it off quickly. Letting it "cool" down usually helps a lot just before shutting it off.

[steve59]

DX3's suggestion will cure the problem. It's just the nature of some beasts.

[william1041200]

my 1200 was backfiring like that too when i got it running . When i finally set timing with ohmmeter, engine temp dropped dramatically, started much easier, and backfiring stopped. Even right after working it HARD.

[TEET]

Here is a nice little writeup about "after-fire" ..



http://cubfaq.com/backfire.html


Jeff (teet)

[cmatthew]

thanks guys. its been doin it forever. runs great otherwise. i have tried the idle down and it still does it. but its not a big deal. just wonderin if it was somethin off. i read that article on carbon build up. was thinkin of taking that chore on someday.