raptor jetting backfires
Mar 6, 2011 | 10:11 PM
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Weekend Warrior
Joined: May 2009
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From: Norfolk, NE
raptor jetting backfires
i just got a 03 raptor 660 as far as i know all it has done to it is a curtis sparks exhaust stage 1 cam and aluminum airbox with dual uni foam filters. first i thought the jetting was off because it kept cutting out so took that off and it still had the 22.5 pilots and they jetted the others at 44 and 46 we put 25's in the pilots and left the other now it seems to run better but backfires alot. any idea on what to jet it at or y its backfiring so much?
May 17, 2011 | 02:45 PM
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Originally Posted by atv connection
Without elevation specifics, it’s difficult to say for sure what size jets will tune your Raptor into smooth running condition. Typically backfiring on the Raptor is a result of a slightly lean condition- do you find that the backfiring is prevalent when you run the engine with the choke on? Does it backfire more often upon warm up or does it make no difference whether the motor is cold or hot?
It could be an issue as simple old fuel in the tank.
It could be an issue as simple old fuel in the tank.
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