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By mga
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!!
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By gatorschevy
I also have a magnum 4x4 that I am working on it is getting a new piston, In the tear down I pulled off the flywheel
and found that all the magnets are not attached? why does this happen? there all in good shape so is it possible
to reattach them to the flywheel? I can buy a different flywheel, but it looks like around $300 or more and one of them on Ebay
looks like the spacing is off a little so it may have the same issue.
the stator looks good also
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By Gwbarm
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.
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By MikeyC85
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 Spark
Has fuel to carb
absolutely fine turning over with spark plug removed.
Any clues appreciated!!
IMG_0315.MOV
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