Yamaha Raptor 350 Backfire

THREADLOCK

Member
Mar 30, 2005
37
0
I have a 2004 Yamaha Raptor 350 4 stroke ATV.
Carb is a Mikuni 38mm BSR
Running at idle the engine backfires through the carb
(into the airbox). Running at high RPM it sounds like it is still doing it,just not as noticeable.
I took the carb apart and cleaned it out.
Machine runs a little better, but still the same issue.
Any help would be appreciated.
Thanks.
 

PE175

~SPONSOR~
Jan 18, 2003
68
0


Sounds like your timing is off a bit
 

gearhead730

Member
Mar 25, 2006
29
0
: Are your valves out of adjustment?If their out of adjustment too tight valve could be slightly open letting it blow back into intake.Or valve seat or valve face is damaged and it will not seal. :ride:
 
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