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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.
Hey I have a 1997 big bear 350 4x4
I replaced the shifter shaft and the shift arm linkage and the rod when I installed them all I was unaware that you had to line the dot on the shifter shaft with the gap on the linkage arm gap put it all back together and rode it I can't get it to shift in the right gears I can move the shift cam by hand and goes in different gears but with the shifter shaft in it riding I can't put it in R or N
Anyone know how to line up the shifter shaft and the shift cam s
My 87 Bear 350 won't start and could use a hand.
Turn key on and Oil light turns on and then slowly fades out. (I think this is key to this) No start, not even a tick.
battery and connections good
A Solenoid post jump turns it over
Neutral Safety Switch wire attached and seems good
It has not had a wire/switch on Rear Brake Pedal ever since I had it.
Any thoughts on some other things to troubleshoot this??
Soon to begin working on a 2002 (i believe) Bruin 350 i recently got back. Reportedly will shut-off while driving it, and blows a fuse (i have not gotten a battery, and begun diagnosis myself yet).
Was told if they change fuse and it goes again for a while until it happens again.
Figured it was worth asking here if anyone has had a similar experience, and determined the cause (worth a shot right?)? TIA.
Hey all back again with my 1989 moto 4 250.
After putting a new carb on it it's really sputtery, it has new gas and I'm wondering what to tune on the carb to make it idle better. I've attached a video to describe the issue more. The bike is still work in progress but I think the video gets the point across. Thanks!
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