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Found 47 results

  1. My old Big Bear nearly left me stranded but I managed to limp back to my garage just before it died. Now No Spark. I’ve changed the obvious, inexpensive and easy parts- spark plug & coil without any luck. Ive stripped it down and traced all of the related wiring, checking as many connections as I can but no luck again. Next I pulled the cover and accessed the stator housing to inspect and do some resistance testing to ID a possible short. Here are my readings: Source coil- 325 ohms Pickup coil- 225 Can anyone tell me if these are good numbers, and if good, where to go next? I assume my next purchase will either be a new stator or CDI, but since neither of these tend to be returnable items I want to be as sure as I can I’m gonna get a resolution to the problem!! Thanks, Gary in SC
  2. Ok i am not quick to jump on a forum and post a question without doing my own part and trying to research and solve the problem myself but I cannot find any definitive information anywhere about my problem. I have a Big Bear 350 that I picked up very cheap which had been sitting in a field for years. I am not new to building wheelers but this one has me beat. After rebuilding top end and replacing the carb it fires right up. The vin has some number worn off from being next to the shifter but from the parts in the clutch i assume it is early since 87 parts seem to be the only ones that match. Thats when the plot thickened. Reverse works fine but when in the forward gears it would not go past 1st and was hard to get into neutral. ie. a it took a million clicks up to thump into 1 and as many down to find neutral. still never getting past 1st. within minutes i could hear metal screeching and whirling around in the clutch side of the motor. I took the cover off to find that 3 out of the 4 springs on the centrifugal clutch had broken and were shredded. Also the black mechanism that the pawl on shift shaft grabs moves was loose so it wasnt always grab to change the gear on the transmission. I tightened that mech, and replaced the springs assuming it would solve the problem since the gears were not actually changing from the lever and the carrier should obviously not only have 1 spring left. After putting everything back together it did go into 1st fairly easy but then i again couldnt get it back to N without a million clicks down and couldnt get it to go past 1st. I did one time get it into a higher gear who knows what one but i gained some speed and dropped rpm. If i jack both the front and the back wheels off the ground and run the motor it becomes much easier to shift and i can get it to run through the gears pretty well. Usually going into N without a huge fight. not perfect but it does hit neutral and roar while spinning the wheels instead of gain rpm and with the power. I have tried every possible position on the clutch adjustment screw without any noticeable result. I think this could potentially be where my problem lies at this point. does anyone know if the case is supposed to be threaded? because mine is not. obviously it seems as though it should be since every other bike ive touched has been. i even took the cover off my quadrunner to make sure it wasnt crazy. when the screw is adjusted and the jam nut tightened the screw will just slide back out since there is no threading in the case. accomplishing nothing. Does anyone have any insight on any of this? Are my plates stuck, Centrif clutch worn out, case stripped or something else crazy im over looking?
  3. Hi guys so I'm looking for any help or advice with a yamaha big bear 350 1997 (i think) it's fairly dirty and just been say for many years, boss says it's a non runner and I've tried and it will not start, ideally would love to do it up and get it running but have been told the engine has gone, cannot find a new engine anywhere. Anything I should check first before just taking the entire thing apart?
  4. Working on my oldest son's buddy's 2000 Big Bear. He was having some power loss at WOT so i thought it worth while to clean the carb and put at kit in it...or at least clean the OEM jets and use the new orings that come in the kit. It starts and idles like a champ, but dies and wants to backfire with any throttle at all. I assume lean because it will run decent with the choke on. Air screw adjusted fine, nice crisp idle. This one has fuel/air screw, low speed jet, mid jet, and main jet. I was assuming just trash in the low speed circuit so pulled it and cleaned again, still does the same. Two questions I guess: 1. Does it sound most likely trash in the off idle circuit? This one has a few more passages and jets than I'm used to...and a darn diaphragm. 2. It now really wants to leak at the bowl drain screw. It doesn't seem to tighten enough to completely stop the flow. Seat looks good, screw was dirty but cleaned up fine with a touch of 2000 grit paper. First for me. Any idea here?
  5. Just picked up a 1989 Big Bear 350 for $250 CAD. Bike was running but lost crank and spark. They've installed a new coil, a couple relays, and installed a Ford starter solenoid in place of the original. Now it cranks but has no spark so they sold it to me. Does anyone have a wiring diagram for this bike so I can test some wiring. Also any ideas as to direction to head would be nice. Lots of things have been hacked together so I know it probably wont be to easy. The ignition switch was replaced with a toggle switch, I already mentioned the Ford solenoid which 1 of the small wires was not re-installed, and a diode or something was removed from the oil temp sensor wire. I'm sure I will find more so a diagram would be amazing.
  6. Hi I have a 2000 big bear 400 and i just put a new carburetor on it and it idles fine but when you try to accelerate it sounds like it is going to die, so when it sounds like it is going to die I will give it more throttle then it will go just fine.
  7. I HAVE a 2002 big bear 400 4x4. I have two wires atacking to the front of the carb. What are they for?
  8. I’ve just bought one of these and came here looking for a service manual Mine has an air cleaner that I don’t seem to be able to find, it has round ends with square tabs on them, any ideas?
  9. Fixing for a friend. Atv was at a different friends house to be fixed and he rebuilt the carb and had it running nice, then it shut off and no more. He replaced the key and the coil. So he got busy, so I am helping, I checked the wiring from the stator to the cdi, and from the cdi to the coil. All is good. I checked resistance on the pickup coil, good, and on the source coil, open. I buy a new stator (China) and the 4 prong plug only has 3 wires in it while mine has all 4. I checked resistance in the source coil and it's in the 300's. I pulled one of the old pickup wires out of the old stator and wire it in the new one. Still no spark. Why do the wires differ, I checked the VIN again and it's "J" for the year and I got a 1988 stator. Please help!
  10. Trying to get the schematics for it so I can rewrite it I bought it for 120$ and all wires r cut plz some one help
  11. Does anyone know if a grizzly parts compatible to a big bear
  12. I have a 1998 Big bear 350...the tail pipe/spark arrestor is broke in the exhaust....how can I get it out to replace it? And what's the best way to get the new one in?
  13. I just bought a Yamaha Big Bear 350 from 1992. The previous owner has run it on regular engine oil and I have problems with the clutch slipping. I think that's the reason. So what should I do? - Just change oil and it will be OK? - Clean engine/clutch + new oil? - Or do I need a new clutch? It is guessing the centrifugal clutch that slips. It has two clutches , it also has a "regular" clutch . Anyone who has any experience of using wrong type of oil?
  14. Hi bought old Yamaha 1990 big bear Guy took off gear selector and lost it anyone know were I con locate one
  15. I have a 2002 yamaha bigbear 400 4x4 with a seized engine. I was able to free the piston with the old "fill cylinder with oil and let it soak" and it worked. So I bought a top cylinder rebuild kit , but now I have no idea the process to fix this . I need a service manual....
  16. Version 1.0.0

    144 downloads

    2000-2005 Yamaha Big Bear Kodiak YFM 400 Service Repair Manual
  17. I’m working on my dads 2002 Yamaha big bear 400 atv. He was having a hard time starting it for a while and then it quit running for good. It had no spark so u replaced spark plug and then cdi box. Didn’t help so tested stator which a part of it wasn’t working so replaced it. Nothing. I unplugged the rectifier cranked it and had a great spark. Got it in today cranked it and still won’t run but does still have spark. What’s going on? Any help is greatly appreciated
  18. I've got the opportunity to buy a running big bear for $130 from a guy I work with, has a winch, electric start, lights work, but the axles are screwed I guess, he says the rear is stripped on the inside (whatever that means) and I guess the front pretty much (or did) snap in half. My question is before I even go and take a look at it, is it worth it? And how difficult/expensive is the fix? Dont have any experience with driveshaft driven wheelers.
  19. Starter is turning every gear except for the one that turns with pull cord. What would I need to replace
  20. Looking for the service manual for a 2007 big bear 250. I have searched the forum for it but cant find it anywhere. If anyone has one or can direct me to the right page would be much appreciated.
  21. got a 350 big bear 4x4 about a 1988 not sure. need upper ball joint, but wales atv say only available with suspension arm . any thoughts appreciated.
  22. View File 2000 Yamaha Big Bear YFM400FWNM Service Manual Factory service manual for the 2000, 2001 Big Bear 400. Submitter wanrep Submitted 01/18/2019 Category Yamaha ATV  
  23. Version 1.0.0

    17 downloads

    Factory service manual for the 2000, 2001 Big Bear 400.
  24. I have a 01 350 Big Bear with less than 200 miles on it, also has warn winch and Boss plow, anyone no what it's worth? Thanks Yamaha YFM 350 S 04 - Service Manual Supl.pdf
  25. Hi, Thanks for a newbie on this site ! i have grinding noise in my front differential. the front right wheel is turning and the left is try to turn but no movement and make sound like a gear broken. somebody have any idea ? not enough oil in diff ? thank

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