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Similar Forum Topics
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By Bobbywolf
I am working on a basket case for a friend. It is a 98 Big Bear (YFM350FWB). It came with a parts machine which is a 96, which I am coming to find out is VERY different from his machine.
Anyway, first thing is first. I checked compression, 150psi. Valves are set correctly, and the engine is in time. I cleaned the carb, and there was some junk in the passages. It is a chinese carb, which I figured from the lack of markings or lettering altogether.
The bike runs. It idles ok, but breaks up badly under acceleration. Pulling a new spark plug shows it is running lean. White strap, with no black whatsoever. So I have the carb adjusted with the mixture screw out way too much (about 5 turns), and the diaphragm needle lifted to the top slot. It is still not getting enough fuel (or too much air). It backfires through the carb, and cannot get above idle without carrying on. The carb boot is in good shape, so it isn't pulling any air there. I did test this as well by spraying ether around the boot when running, looking for intake leaks.
Anything big I am missing here? I am starting to believe that this chinese carb is the issue. This quad came with the original carb, which I would like to rebuild and use, but the mixture screw is totally stuck, and stripped way down in its recess.
Thanks for any assistance.
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By p5200
I'm assuming, it's alright to test the engine after adjusting valves without the rear axle installed? Can someone please verify this? I'm waiting on axle parts and wanting to get that done while waiting. Thanks! 🙂
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By marlon smith
1990 kawasaki bayou 300c idles fine but pops out exhaust and intake when trying to excel, will not take throttle past 1/4 , any one had this problem?
have replaced carb twice, same thing, fresh built engine cylinder head, same as before, new spark plug, flywheel key is good, pulser test good, good spark
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By p5200
I'm wanting to try and get the machine on blocks. I just want to verify my AWD is working. How do most of you go about doing this. I want to be safe since it will be in gear with hopefully, all wheels spinning. Thanks! 🙂
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By p5200
Hello folks, I have a Polaris 500 Scrambler. Not positive I need a new battery. The folks I got the ride from said they put a new battery on it right before selling it to me. It's been a couple cold months before I tried starting it. After jumping it now, I let it idle plus revved it quite a bit for about 20 minutes. Then I shut it off and tried to restart barely turns over and that's it? Am I not giving it enough charge time maybe need to actually ride it? The battery on it is a Continental CTX9-BX. I lf a new battery is needed would maybe Amazon have a decent one? Thanks!
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