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2007 DR650 Engine Knock

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Hi All,

 

I have a 2007 DR650 with about 18,000 miles on it. Just recently, I can hear the engine knocking. I can only seem to hear it when I'm cruising on the freeway. When I WOT, I can't seem to hear it, only when I'm cruising around 70mph do I hear it.

 

I have cut open the airbox, new jet kit, and GSXR x40f0x exhaust mod. I think I may have jetted my bike SLIGHTLY rich at around the 13,000 mile mark.

 

Has carbon built up over time, and is now causing the knocking?

 

Thanks

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check the primary drive nut, they sometimes come loose

Ok, I will check, thanks. Do you have any other advice, or hypotheses for why it is knocking?

 

I'm thinking to do a valve adjustment, check spark plugs, run 91 premium octane fuel (instead of the regular 87 octane), and do a full seafoam treatment (to clean the carbon buildup, carburetor, and crankcase). Any other suggestions?

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not a bad idea to check valve clearance & fresh spark plugs, also you could check the cam chain tensioner for chain wear.

are you certain the knock is coming from the motor?

ever seen the way the chain jumps around on a big bore thumper? even cruising, its violent.

check the chain adjustment & condition of the chain, sprockets & cush drive.

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