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cbr wont start after valve shim

Old 08-22-2011, 08:44 PM
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Join Date: May 2009
Posts: 68
Default cbr wont start after valve shim

After reshimming the valves, I went ahead and connected the manometer for syncing the throttle body. Now it is not starting. I am assuming it may be the placement of the cams, but would like others feedback please

cbr f4i noise - YouTube
Old 08-23-2011, 02:28 PM
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Join Date: May 2009
Posts: 68

I proceeded to redo the cam placement and thought about just removing the cam sprockets while it was still in the bike, with the cam holder bolted. As I turned it, it also turned the camshaft backwards and it basically jumped a tooth. Now every time I rotate the engine, right after TDC, it will knock once and there will be slack on the top of the chain, between the two cam sprockets. Seeing how I was going to realign the cams, I figured it was going to be fine. When I got it all back together again and rotated it, the jump and sudden slack in the chain between the sprockets reappears/occurs.

Have I just bent a valve???

(*I know the chain guard is upside down*)

I also figured out the above problem, the IN and EX were off a couple of teeth for the correct alignment.

Last edited by shok47; 08-23-2011 at 02:48 PM.
Old 08-23-2011, 11:19 PM
redzintimidator's Avatar
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Join Date: Aug 2007
Location: Greene, NY
Posts: 2,950

From what i remember when i did it, compression makes it do that. I actually got my bike all back togeather and took it for a ride and it knocked and had no power.(quarter mile ride). My intake valve was one tooth off. not sure what would have happened if it were more. Follow the repair manual to the letter with the timing adjustment. no room for error there
Old 08-26-2011, 02:46 AM
Zero1080's Avatar
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Join Date: Apr 2009
Posts: 1,185

(This is why I'm paying out the *** for the dealer to do it for me)
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