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Hello, got this bike in to replace the jug and piston. Made the swap, crank looks good, no play in connecting rod. Put it all back together and then heard a rubbing noise in the rear crank case. Ordered a new timing chain and tensioner. Installed them and put it all back together. Fired it up and ran great on the work bench. Took it down and went for a ride and noticed the higher the rpms, the noisier it got. There was a tapping noise on the exhaust side of the valve cover. Removed valve cover. Checked valve clearances, all good. Checked the valve springs, the were a good bit out of tolerance. Installed brand new springs. Same noise. Decided to replace the whole cylinder head with one from a known good bike. Still the same noise. Decided to replace the camshaft with one from a known good bike. Still makes the noise. Replaced lift caps. No change. I’m at a loss on what could be causing this noise. It’s very loud and not normal by any means. Any suggestions would be appreciated. Video doesn’t really pick up the noise good, but it’s there.
By Hunsaker Tim
2004 700 twin peaks
When i get to about 10 mph i get a very (tinny ) noise from the right side of the engine / clutch area.
originally I thought maybe something got caught between axle and skid plate ie : rock and was just rubbing producing that sound.
I took off the skid plate and drove it and still had same sound.
Checked the lug nots and they were a bit loose , tightened them and still same noise.
Took off the what looks like an inspection plate on top of clutch cover and looked inside this apart and it is dry of any fluid.
Not sure if there should be any fluid in there or not had clutch replaced 2 yrs ago with nominal riding since.
I do not have the time or knowledge to take this apart and try and diagnose. The only repair areas around here are absolutely terrible.
The shop I normally do the work are 2.5- 3 mos. behind. Any suggestions would be greatly appreciated.
By John Victor
My father-in-law gave my boy a 1999 350 Big Bear. It's been sitting in a barn for a bunch of years. It runs great! My boy has been riding a couple weeks now and it has developed a squeal coming from the front end when you get off the gas at speed. No noise during acceleration. At first I thought brakes. I took it for a ride and I don't think it is the brakes. I feel it is the front prop shaft U-joints, front differential or one/both axles. I pulled the fill plug on the differential and I can't find anywhere how much gear oil should be in there. My gut says up to the fill opening. It doesn't have a manual. It's wet in there, just don't see any gear oil.
#1 Should I fill the differential with gear oil up to the fill opening?
#2 How do I check or know if the u-joints are bad? That looks like a "Big Bear" of a job if they don't need to be replaced.
#3 What else could it be? I don't think it is the front bearings. I jacked the front wheels off ground and no play in the right wheel. Very little play in the left wheel, looks like the lower control bushing is where that play is coming from. The rubber CV boots look original but all still intact. Wheels spin easily without any noise.
Thanks for any help!
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