Jeramie Posted November 1, 2011 Report Share Posted November 1, 2011 I have a 2005 Yamaha bruin. It has been a great bike but now im starting to have troubles. We took it on an intense ride in Mount Magazine Arkansas. Because of the situation we had to ride it hard. After getting back we had not troubles for a month or so but suddenly I noticed it sputtering and cutting out. It wouldn’t idle worth a hoot. I checked the exhaust, good output so it was possibly the air side. I pulled open the airbox and found about 1/4 of a quart of oil. I had just changed the oil before our trip and this oil was clean so I know it was recent. I checked the oil and it was very, very low. I poured in another 3/4 of a quart. When I started it again it spit and sputtered. I didn’t pull apart the airbox again but I’m pretty sure it spit more oil in. I know the crankcase has a vent hose that leads to the airbox. However, I have a hard time believing its pressured oil coming through that line, at least not that much oil. My best guess is its blow-by and I need to replace the rings (re-work the top end). That’s my guess anyway... anyone else? Quote Link to comment Share on other sites More sharing options...
MUDRUNNER Posted November 1, 2011 Report Share Posted November 1, 2011 I have an old Bombardier Quest 650 that does the same thing. It's been that way since it was new though. The dealer told me it's normal after hard riding to have oil in the airbox. I just clean it out every so often and keep it full of oil. I would try a good carb cleaning and a tune up to see if that helps it run any better. Quote Link to comment Share on other sites More sharing options...
Jeramie Posted November 1, 2011 Author Report Share Posted November 1, 2011 I guess it could be but really seemed like a lot of oil. I may do a tune up before I change out the rings... Quote Link to comment Share on other sites More sharing options...
brad dryden Posted November 4, 2011 Report Share Posted November 4, 2011 That sounds like ALOT of oil did you do alot of hill climbing by any chance? Is it carburated or fual injectected? Quote Link to comment Share on other sites More sharing options...
LETMGROW Posted November 5, 2011 Report Share Posted November 5, 2011 Sounds like a ring problem to me. I would take it to a reputable repair shop and have a compression and cylinder leak down test performed. If you have a broken or just worn rings, these symptoms will be exhibited. " Blow by " as it is often referred to will allow oil to slide past the rings and be blown through a fresh air breather tube into the air intake box. If this hasn't been a common occurrence in the past, it certainly isn't normal. Lynn Quote Link to comment Share on other sites More sharing options...
hungry hunter Posted November 5, 2011 Report Share Posted November 5, 2011 You already called it. Same symptions with my 03 Eigher, 42 dollars on E-bay for entire upper end kit. which included all rings and, gaskets, and o rings. Quote Link to comment Share on other sites More sharing options...
Jeramie Posted November 7, 2011 Author Report Share Posted November 7, 2011 I took the airbox appart yesterday and took all of the oil out, cleaned the filter. Oil level is good right now. im going to drive it around this week (ranch work) and if it gets oil in it again im going to chase it. Im hearing a million different reasons including the steep inclines we rode in Arkansas. If it happens again any time soon ill likely just change out the piston and rings to be safe. They are too cheap and a top end re-build diesnt require much. Quote Link to comment Share on other sites More sharing options...
Jeramie Posted November 28, 2011 Author Report Share Posted November 28, 2011 just an update. After cleaning out the airbox and draining the fuel from my carb I havent had any troubles. The bike is running with a little more lag than usual but im putting a new plug in it this weekend and I figure it will fix that problem. So as of right now all is good and it appears it was all just the rough ride we had taken the bike on... Thanks for everyones input... Quote Link to comment Share on other sites More sharing options...
Ravin R10 man Posted August 28, 2020 Report Share Posted August 28, 2020 If I get oil in my "air box", it usually results in me having to change my shorts! Haa! Quote Link to comment Share on other sites More sharing options...
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