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2000 Yamaha Big Bear 400


Gwbarm
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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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Most yamaha seem to have a lot of wires going into their cdi..  Perhaps just drape the wiring over the bike and connect it up and see what you find.... If it's a wiring problem it should be easy to find, it's either going to be a short, which needs chafed or melted wires and so can be seen, or a broken wire, which mostly happen at the ends of the wires where they connect.. or occasionaly up near the steering head. The steering head breaks are the hard ones to find..

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HaHa, I too feel your pain. Did the same thing on a 2001 kodiak. 

Guys said it had no spark. Tweekers tore it apart and I got most of it in boxes. 

Turns out it has spark but the rear end was locked up. LOL 

Anyway, I already had decided I was going to fix it no matter what so I started putting it together figuring I would troubleshoot when I get to a problem. 

If you can get the wiring diagram (I cannot access them yet) there might be a way to hot wire it. Or at least take resistance readings and see if anything is out of spec. 

Or just keep putting it together.

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Thanks guys for the quick response. Iv been checking the existing wiring harness and it seems to all be intact did not notice any problems except for the missing parts the coil that came with it  looked like it had never been on a bike was bad, primary resistance was good no resistance whatsoever on the secondary even took the wire and cap off still nothing. The key is missing have to get a new switch and all the other parts I mentioned earlier. You are right Mech about the CDI it like the wire hub central all the wires go there with 3 big plugs. I was thinking the red and white was hot and I might be able to feed voltage there directly to see if it would spark but was not sure if it needed 12 volts there or lower, the service manual didn't really say or I missed it, it doesn't really tell you a check for CDI it has you run all these other tests and if they pass and still no spark replace the CDI. I think I will take your advise go ahead and hook everything else back up and then start looking for the problem. 

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