backfiring issues

[lux22]

g"day everyone i own a lifan 140 and lately it's been backfiring heaps. does anyone have a solution or a way to tone it down a bit?

 

[no_crf50_here]

1. Look for airleaks after carbie
2. Is carbie tuned right
3. are you on and off throtle - that'll throw a nice backfire..
4. CDI faulty?

Just some things to try.

 

[Divy]

look for air leaks where the carby joins to the manifold like nocrf50here said
if there is no air leaks try where the exhaust bolts to the head cause those bolt vibrate loose easy

if its not from them i would re-tune the carby

 

[darb110]

when does it back fire? does it only do it when quickly shut the throttle closed because this is ok and in some minds good =) and there is theory behind it..


this is what i read off a site for a previous thread made and it was that if your running say full throttle the the air fuel mixture is fueling the engine nicelly but when you quickly drop that throttle closed then the mixture that is being suppled leans out heaps and there heaps more air to fuel in the mixture there for the mixture doesn't ignight in the head and keeps moving the the exhust system and ignights there and causes your backfire

so there for its ok if it does backfire abit and as the site said its a good thing for the engine to do it =)

there you go, wonder how many agree with me XD

 

[cass38a]

look for air leaks where the carby joins to the manifold like nocrf50here said
if there is no air leaks try where the exhaust bolts to the head cause those bolt vibrate loose easy

if its not from them i would re-tune the carby

do this ^^^^^^^^