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Hi !! I bought a 2006 raptor 700r in great shape but is it normAl that the motor make noise ?!? that's not excessive but i always ear the motor at the idle and at low rpm.
If your engine is running and you're not deaf... It's normal to ear your engine running !!!
 

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Hi !! I bought a 2006 raptor 700r in great shape but is it normAl that the motor make noise ?!? that's not excessive but i always ear the motor at the idle and at low rpm.
The 700 engine has a loud valve-train. Best way to describe it is that it sounds like a sewing machine. It's pretty loud, you definitely hear it over the stock exhaust. It's loud enough that it can sound abnormal if you aren't used to it :)

Gets even louder if you install a cam...
 

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Also I wouldn't replace the chain roller with a stock replacement as I just finished my second one. I replaced mine with a TM designs roller that has two bearings instead of one! Seems like as soon as the chain stretchs, it wants to burn out the factory bearing, so I'd also check your chain slack and adjust if needed.
 
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