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Yamaha Warrior Backfiring

This is a discussion on Yamaha Warrior Backfiring within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; Hi everyone, I recently purchased my Warrior, it is a 1997, I went out for the first ride last week with my kids after installing ...


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Old 09-12-2009, 12:05 AM   #1
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Default Yamaha Warrior Backfiring

Hi everyone, I recently purchased my Warrior, it is a 1997, I went out for the first ride last week with my kids after installing a carb kit, ran the ATV all afternoon, I had a blast, tonight I started it up and while idling it will backfire through the carb from time to time and sometimes it will kill the engine, I played with the air screw but this made no difference, I pulled the carb and cannot see anything wrong, has anyone ran into this before? Thanks in advance Brian
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Old 09-12-2009, 08:19 AM   #2
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Hey Brian, yes I ran into that problem. I ended up installing a carb rebuild kit and closed the parking brake by hand since it was frozen open. You already did the carb so try that bogus switch on the left handlebar. I hope it's that simple, but may require more investigation.
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Old 09-12-2009, 08:51 AM   #3
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Thanks for replying, the parking brake switch already is disconnected, the ATV runs great except when it sits and idles, I am not sure where to look, Brian
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Old 09-12-2009, 09:25 AM   #4
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Are you sure the pilot jet is clean? There are tiny holes in it the get clogged up really easily. On my kid's quad(honda recon) the idle was sparatic. Really bad and backfire until it warmed up, then it would rev high on it's own. I cleaned out the pilot jet and lowered the idle. now it's fine.
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Old 09-12-2009, 11:14 AM   #5
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I will check it, with the new kit, I installed a new one, not saying that something could not have gotten into it, I will let you know. Brian
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Old 09-12-2009, 11:20 AM   #6
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I was also going to ask, I installed a new needle and clip, I found it extremely difficult to do, I unscrewed the two little screws that hold the plastic guide in place and had to remove, then I tipped the carb over to get at the needle, reinstall was very difficult trying to ge the little spring in place, is there a better way? Thanks Brian
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Old 09-12-2009, 11:25 AM   #7
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How does the sparkplug look?
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Old 09-12-2009, 04:06 PM   #8
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Plugs look pretty good, not black, dark brown, I will take the carb apart this afternoon and post what I fing. Brian
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Old 09-12-2009, 09:03 PM   #9
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Have you checked the actual spark itself?
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Old 09-13-2009, 10:33 AM   #10
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Weird but true, I was scratching my head trying to think of what to try next, the spark looks excellent, I was looking at the Idle screw on the side of the carb, I noticed that the spring was compressed and it appeared the idle screw was turned in very tight, but my idle is good, I turned my air screw all the in, backed it out 2 turns, I started the atv up at idle, I started backing out the idle screw, I turned it close to 3 full turns out before the idling finally went to low, I turned the screw back in may 1/4 turn to the correct idle, as of now the popping at idle is gone, I have no idea, I am going to let my son ride it around the yard today and see if the issue reappears. Heard of anything like that? Brian
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