Question about 2002 Yamaha XJR 400 R

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I have a 2002 Yamaha Big Bear 400 ATV, This bike started smoking blue/white smoke from the exhaust. This smoke is excessive and started all of the sudden. Last year we were riding and my son in law sunk this bike in the mud and water. He continued to try and get it loose rather than shut it down and wait to be pulled out. The bike was up to the seat in water. after it quit running we pulled it back to the trailer and took it home. once it dried out I changed the plug it fired right up but idled rough for a while. after changing the oil and gas it run OK until this. I have checked the compression and it is at 110 -120 so this tell me the rings are OK. I changed the oil and drained the gas again this didn't help. I have ordered the manual from Clymer but this tells me how to fix the problem but does'nt tell me how to find it. I have read on forums that maybe a vent line is plugged which would make sence after the water incident but I have check the rubber hoses and they seem clear. I am leaning toward valve problems but the compression test makes me assume they are OK. This bike runs great but the oil smoke is bad enough to bring tears to your eyes. Please help by telling me where to look. Thank You

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Maybe you need to replace valves oil seals

Posted on Apr 27, 2010

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