2008 Big Bear smokes at start up when cold outside
#11
I have had three big bears 350cc and the newer 400cc all of them developed smoking at start up. This is due to a leaky valve guide seal.. It is very common and anyone at the yamaha shop that you tell your story to should know about this issue. If it only smokes after it sets a while and then stops it is more than likely this seal.
My first big bear it started after only owning it 3 months no idea mileage was no gauge the next two were around 600-1200 miles before it happened.. If it makes you feel better I don't think it affects performace at all and it doesnt affect the reliability at all. My big bears were all pretty much bullet proof.
My first big bear it started after only owning it 3 months no idea mileage was no gauge the next two were around 600-1200 miles before it happened.. If it makes you feel better I don't think it affects performace at all and it doesnt affect the reliability at all. My big bears were all pretty much bullet proof.
#12
I have had three big bears 350cc and the newer 400cc all of them developed smoking at start up. This is due to a leaky valve guide seal.. It is very common and anyone at the yamaha shop that you tell your story to should know about this issue. If it only smokes after it sets a while and then stops it is more than likely this seal.
My first big bear it started after only owning it 3 months no idea mileage was no gauge the next two were around 600-1200 miles before it happened.. If it makes you feel better I don't think it affects performace at all and it doesnt affect the reliability at all. My big bears were all pretty much bullet proof.
My first big bear it started after only owning it 3 months no idea mileage was no gauge the next two were around 600-1200 miles before it happened.. If it makes you feel better I don't think it affects performace at all and it doesnt affect the reliability at all. My big bears were all pretty much bullet proof.
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#16
Plus one on oil level also check oil to make sure your carb. hasn,t leaked fuel in engine oil[ due to hauling with fuel value turned on or water has got in fuel and float value not seating correct. Yes check oil level, then if evertything okay, do you have any squeaks or rattles on cold starts? in oil filter in correctlly? I think there are an oil pressure bolt in top of head maybe 10mm head around the top right of head i think, see if oil comes out of it after removed and start up cold... you have some slag from engine being new and not letting oil thru head when engine cold, but still head may need removed. IMO if i was nervous bout top end being removed at dealer, then check history of dealer servicing dept. and ask to see certifate of training, ask if they stand behind there work, may have to replaced value guide aslo....If was me with my training i would remove exhaust system and carb intake modifold and let engine sitt maybe a week ]with ports plugged up] then take an flash light and look into ports of head to see if any oil is on back side of value or values, This is an great way to see if stem seals are leaking, they willbe oil on back of value, if so the engine will smoke until oil is burnt off. But you have to remember most warranty will not covered if engine been tapered with,It just away to satifly your concerns.
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