Raptor Forum banner

1 - 4 of 4 Posts

·
Registered
Joined
·
64 Posts
Discussion Starter #1
My buddy has a 04 yfz with a big bore kit. Not sure what compression piston along with a dynatek programable ignition and ful hmf sport sereis exhaust. Plug color is perfect but it will not idle and it cuts out and spits flames out the pipe. What's wrong lol
 

·
Registered
Joined
·
4,086 Posts
my friend is also going through the same problem. his bike only has exhaust, intake and a cam mod. just postin so ill be suscribed to this thread and maybe get some answers.
 

·
Registered
Joined
·
907 Posts
I have run into this problem a few times now and may have a solution for you. When i get a 450 in the shop with the same symptoms as you have, wont idle, pops and backfires a lot, the first thing i check is the air screw on the bottom of the carb. Pull that screw out make sure there is 1 spring, 1 o-ring, and 1 washer that comes out with it. If there is no o-ring, the bike runs lean and does not want to idle.

Hope this helps....
 

·
Registered
Joined
·
64 Posts
Discussion Starter #4
Thanks I will give it a try and see what happens
 
1 - 4 of 4 Posts
Top