Raptor Forum banner

1 - 8 of 8 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter #1
I have an 07 yzf450, pipe gets red hot and when its cold it backfires until its warmed up, sometimes have to run 1/4 choke, any ideas how to fix it?
 

·
Registered
Joined
·
6 Posts
Discussion Starter #2
when i go to give it throttle it backfires, but run on 1/4 choke it runs decent then when warmed up its fine
 

·
Registered
Joined
·
9 Posts
normal... Mine is cold blooded also, let it warm up then go nuts.
 

·
Registered
Joined
·
21 Posts
So the red pipe and backfire is normal after pipe and jet.
 

·
Registered
Joined
·
55 Posts
Backfire sounds lean. Does it do it on deceleration too with no throttle? If its only on startup, I'm not sure, but if its also on deceleration, you are lean.

Red header pipe is totally normal on a YFZ. God I can't tell you how many pairs of riding pants that pipe has destroyed for me..
 

·
Registered
Joined
·
4,089 Posts
my buddies yfz did this until he went up a size on the pilot. apparently the carbs on yfz's (fcr's i think) are really touchy.. we got it dialed in though. jetting is trial and error
 
1 - 8 of 8 Posts
Top