startin trouble....

[dpizz450]

my kfx has trouble startin.....i kno i need to get it rejetted but it jus started doin thsi and it hasnt been rejetted for a while and it just started...........i half to give it a lil gas to get it started and it will like backfire a good bit when i give it osme gas but when i get it goin its good but when i slow down it will start to cut off.........i chcecked my airbox cleaned my air filter.....the batteries good i think what else could it be?

[KFX400MxR]

try adjustin the air scerw.

[quadnice]

check the breather line, coming off the back of the fuel petcock valve.
sounds like an air leak

[TGW_400ex]

Originally posted by YZrida
my kfx has trouble startin.....i kno i need to get it rejetted but it jus started doin thsi and it hasnt been rejetted for a while and it just started...........i half to give it a lil gas to get it started and it will like backfire a good bit when i give it osme gas but when i get it goin its good but when i slow down it will start to cut off.........i chcecked my airbox cleaned my air filter.....the batteries good i think what else could it be?

do you let it warm up? That has caused my ex to do that

[SHOCKER]

also check the overflow line out of the gas cap, if its kinked it will do this, it happened to me the first trip on my bike on a night ride so i got towed back and my friend was looking at it and sayed o hey your hose is kinked so i twisted it back to where its not kinked and it ran great again

[kickin kfx 400]

check or replace the spark plug

[300_14_racer]

mine did that and the valves needed to be adjusted