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Discussion Starter · #1 ·
ok i just started getting this sound from my bike that sounds kinda wierd i know yamaha normally has a slight tapping sound but this is kind of a slapping sound and it worry's me.... the bike has had no change in performance but i am not running a rotella type oil and maybe that is why just need some insight... please help.... also the bike has big bore kit
 

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What is a Rotella type oil.
 

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Discussion Starter · #4 ·
yeah ill try... its like a crank clacking noise... if i am standing in front of the bike i can hear it pretty good and if i stand behind the bike i cant hear it at all... sounds like a its serious but like i said it goes away if i rev it up and the bike still rips around like nothing is wrong
 

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Dosnt sound like valves need adjustment. Tke off the gas tank and check upper mounting bolts. They can make quite a racket if loose. Thes engines will vibrate quite a lot. Cranks will only make noise if the piston pin wears out or lower rod bearing. Check the simple stuff first. Welcome to the forum.
 

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Good call Dog 86!!! Forgot that one. Pull your timing chain adjuster and see if it is almost maxed out. The shaft with notches will be out quite a way. This means your chain is streached and needs replacing. It can "slap" on the inside of the cyinder or head cases.
 

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I had a similar knocking noise that we finally tracked down to one of the 30+mm nuts on the clutch side that wasnt tight, I cant remember which one it was but it is another thing to check especially if it has ever had a crank replaced.
 

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Discussion Starter · #9 ·
thanks guys and i will try and start tracking it down... this is the first forum that i have ever been on that people have really tried to help me out.... also does anyone know where i can get a good set of graphics for my raptor like monster graphics or some name brand company's... just want it to look like a race bike lol
 

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Thats what I thought he was talking about with the oil, I use to use it when I drove a truck.
 

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thanks guys and i will try and start tracking it down... this is the first forum that i have ever been on that people have really tried to help me out.... also does anyone know where i can get a good set of graphics for my raptor like monster graphics or some name brand company's... just want it to look like a race bike lol
Try Rocky Mountain Atv or e-bay for graphics. Remember, each graphic will add 1mph;) Welcome to the forum
 

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I had a similar knocking noise that we finally tracked down to one of the 30+mm nuts on the clutch side that wasn't tight, I cant remember which one it was but it is another thing to check especially if it has ever had a crank replaced.
Probably the nut that secures the counterbalancer gear, or the one on the end of the crank that holds the drive gears, I have seen these be loose on occasion............
 

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Probably the nut that secures the counterbalancer gear, or the one on the end of the crank that holds the drive gears, I have seen these be loose on occasion............
Ya I think it was on the end of the crank but it has been long enough I cant really remember.
 
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