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I just brought home a used 2005 Yamaha Big Bear 400 4x4. It needs front wheel bearings, and a new choke cable. I think i can handle those two items. However, when i went to look at it, it ran good, shifted good, brakes all workds great, but at home when i started it, it would idle nice, but when i gave it gas it seemed like it was flooding out and would die. If i just gave it a little throttle it built up RPMs but any more throttle it began dying out again.
any suggestions why it's doing that?
I'm looking for a service manual, but forum rules say i have to make 10 posts..lol
oops...i just realized i posted in the wrong section of the forum!!
95 bayou 300 2wheel. This is my first four wheeler. The guy I bought it from showed me slight drip on his floor from a drain plug he recently retapped. I figured I could handle a small leak from a second hand machine. Well after a few times of riding it the bayou seems to be running low on oil. Now maybe this is normal operations as well so I refilled the oil. But the next day I notice my drip on the floor was slightly larger. I wanted to see this drain plug for myself so I took off the skid plate and found a pretty rough looking installed drain plug. It does have a small drop but also seemed to have an excessive gasket and maybe some grey looking “jb-weld” ish material around it. So that’s scary but I figure surely that’s not the only source since my floor spot Grew a bit. I went on to find recent moist around the head gasket for the top end. I’ve never seen it drip but it drips on the new starter the guy installed so it seems the head gasket leaks too. He did say he replaced that gasket when I inquired about the darken stains around that area of the motor. He said he replaced that gasket during. Ring replacement when the bayou was smoking. It no longer smokes by the way. So I continue on thinking well maybe I can do another top end gasket myself some day but still the oil on the floor suggests a more visible leak. I mean it’s not a lot but it grew as I mentioned. Then I find my what seems to be an awful thing. The pull cord and starter was replaced by the preavious owner and it appears there’s a busted area on the crankcase where the left side cover mounts to the L-case.I have not seen oil from there but that looks scary to me. Does this area hold oil? I wondered if it doenst maybe I’ll leave it be but if it does it’s probably the reason I lost some oil. I also found tonight oil on the rubber boot cover I think is for the drive shaft or something. Idk my first ride so I’m unsure of how to proceed. Especially with the case cracked like that. I don’t know how the engine works but if there is indeed oil there in the operation of things it seems like I must do a major engine over haul….. any insight would be so very helpful. I bought this for my daughter but I may have been bitten by going with such An older model.
Finally getting around to the Yamaha Big Bear that followed me home in August. It is a mess. I got it off of marketplace, the add stated " runs like nothing is wrong the only thing that's wrong is it needs a new wiring harness". So iv been looking for a new wiring harness although it came with a wiring harness that was out of the bike, so I assumed he had ripped it out. All the plastics were off and no screws or bolts to reinstall but they were in good shape. The coil, voltage regulator and starter solenoid was missing but came with new one. So I go out expecting to start installing the wiring harness and find out its still in tact with these parts missing. The first thing I found was the engine was stuck and there was no spark plug in it. I noticed when I bought it that the pull starter wouldn't rotate the engine but he assured me the engine wasn't stuck that there was something wrong with the pull starter, I was skeptical but took him at his word. I didn't check it that closely because I was really just buying it for the tires and wheels they were worth twice what I paid for the bike. Im a little new at buying on marketplace and am just angry that someone would lie like that, now I don't know if anything is really wrong with the wiring harness, im probably too trusting I usually trust people until they give me a reason not too. I would have bought it anyway, if I go to the trouble of hooking up my trailer and wench and driving there its coming home with me, long as its a Honda or Yamaha I can fix it. It took PB Blaster about 24 hr and I got the engine freed up, and it has good compression, using ye ole thumb over the hole test, and the pull starter works fine Thats enough of that, now for my real question, before I go to the trouble of chasing the wiring problem down I would like to see if the engine is ok , is there anyway to feed voltage directly into the cdi to make it spark.
Hey guys and girls - I’m at a loss and need your help!
My jianshe 400 ML has been starting great on pull start but nothing on electric. Narrowed this down to starter clutch so have changed this and now engages fine.
problem is since changing she struggles to turn over. Had it hooked up to a car battery just to see if it will flick over but to no avail.
Has fuel to carb
absolutely fine turning over with spark plug removed.
Any clues appreciated!!
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