'93 Big bear 4x2, 350cc. Fresh rebuild, black smoke and bogg out
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By 86ccord
Starting this build thread to keep up with everything on my build and hope to motivate someone!
I picked up this 2008 Yamaha Big Bear 250 2 weeks ago. A guy that I hunt with parked it at the hunt club for a year or so before I asked him if he wanted to sell. He said " fill my feeder and throw some batteries in my cameras, and you can have it". Sounds like a deal to me!
I have attached some pictures of how it sat under a tarp in the woods and when I got it home and cleaned up a little.
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By Kaz
Troubleshooting a no spark issue, was running OK, maybe a little rich, turned it off, now no spark. I've checked/ohmed out the main key switch, the start/stop switch, neutral switch, brake switch - all good. It will crank the starter, but no spark with the starter or when I try the pull start. I've checked all fuses and diodes. Swapped battery. New plug. New coil. Swapped in a used CDI - no help. Traced, removed, cleaned, reattached all grounds. Removed things like my winch from the circuits to be sure a bad relay or something was dragging it down. When testing voltages, the orange wire going from the CDI to the ignition coil shows no/very low voltage-shouldn't it have 12V on it? Sometimes I get a very weak, intermittent glow on my spark tester, but not enough to fire the plug. I've checked continuity on just about all wires in the harness. Checked/cleaned/lubed w dielectric grease- all connections, redid a few that looked old/dirty. I've checked the stator resistances, all good, but have a stator and rectifier ordered anyway, will arrive Sunday. I verified that the rectifier has a voltage output back to charge the battery while cranking - 10.5-11V, low, but expected while starter is engaged. What else can I check as part of troubleshooting? I have a Haines service manual, but the 1999 350 4x4 seems to be an odd model, there isn't an exact electrical diagram for it, but found one for another year that has all the same number of wires and same color wires, so I've referenced that. Any hints, tips or advice would be appreciated! Thanks!
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By mga
I get it, turn counterclockwise will decrease, turn clockwise will increase. My question is what exactly am i increasing or decreasing? Is it clutch pressure? In many videos i've seen it's always "turn counterclockwise" until you feel resistance then back off. Why is it always to decrease?
I'm just curious as to what exactly is going on when i turn that screw right or left. And, since there's no manual clutch to engage or disengage, what is going on inside?
Reason why i'm asking is while going down a hill in 1st gear, it appears to pops out of gear, but no neutral light, and if i stop, it's in 1st gear still. BUT, (always a but) if the engine is warmed up, it stays in 1st gear. The hill is too steep to use any other gear, so 1st with the brakes is the only way to go down.
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By Bobbles
Hopefully someone can help me out, I purchased a 350 moto4 2wd while I'm trying to fix a dying honda. I can't see the vin number as there was damage and a bar has been welded where I think the vin should be, The decals say 350 moto4 Huntaway, it has the square gear change low, high, reverse up on the left of the handlebars and it has three rectangle lights up on the dash. after googling I'm struggling to find anything called huntaway, Any ideas? Thanks.
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By Bobbles
Hi all, new to here, looks like a great site. Own two atvs, an at the moment not working honda fourtrax and a yamaha moto4 of some description, trying to work out what model yammy it is.
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