1986 or 87 Honda 250sx ATC keep or sell
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By jay41198
I am missing a cdi box for my 1988 Suzuki quadrunner LT 4WD is there a rplacement box that i can wire into this bike to get it back running beings that the cdi box is no longer made
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By jeffinotown
Hey guys and gals. I've been working on my friends 2007 big bear IRS. Unfortunately after 3 different people got their hands on it and only made things worse every time. After months of finding just crazy problems everywhere. I'm finally at the point we're its almost 100% !!! But I'm getting a short somewhere between the 4xW switch I believe. I managed to by searching the internet like a fiend, got my hands on an official Yamaha wire harness for the year and make. But I don't have the numbered component list and to be honest. After hours of going through and making everything so it's easy to reference. If anyone has a picture of the referenced components. I would be forever in your debt. I've spent hours marking up the blown up diagram so it will be easy, for any possible future repairs. Please and thank you. Here's a picture of what i have so far. Unsealed it in plastic so oil and crap won't spill or get smudged. This damn things worth it's weight in gold. Thanks Jeff 2007 Yamaha big bear 400 IRS. YFM40FBW
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By sunn
Maybe someone has the answer to correct a long cranking but did start after maybe 10 seconds?
Temp was mid 70's, with ATV not run for maybe a month but on battery maintainer with full bat charge noted. The atv started, but then died a couple times after repeated attempts. But when run awhile everything was ok. Although when starting now I do hear the fuel pump humming but seems to take a few ,"long" seconds before full prime pressure.
Is this typical of a failing fuel pump?
I've priced a replacement fuel pump on eBay for less than $40 so am tempted to simply replace it for good PM. Just had all covers off so looks really easy to replace.
Any ideas?
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By BillR94
I picked up this ATV that had no spark. The previous owner said he was driving it and it died and would not start. He discovered it had no spark. He replaced the CDI and the coil with no luck. He got tired of it and I bought it. I replaced the stater and now it has strong spark. Now, it starts for a second or two then dies. It will not stay running. I have checked the timing and it is spot on. The valves are adjusted correctly. I see no warn issues with the cam. I put the original CDI and coil back on it. Same problem exists. Compression is at 65 psi (has decompression mechanism),
I took off the muffler in case the issue was clogged pipes. No change. I replaced the spark plug. No change. The carb was an aftermarket so I put a Niche carb on with no change. I bypassed the fuel pump and that did nothing to solve the problem.
I don't know if this is a carb issue or an ignition issue. I am looking around locally for an OEM carb to try out but not sure that will fix the problem.
Can anyone help me solve this problem. I am running out of ideas.
Thank you for your time
Bill
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By Olchap
Hi, I am new to this forum and I am happy to be here. I purchased a Yamaha 350 Big Bear without a title and I cannot find a Vin number to find out what year it is. I am hoping someone here can help me identify this atv. I checked on the main frame near the front A-arm left side found nothing. I checked up near the radiator and found nothing. Where else should I look? See image below.
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