Question about 2005 Honda CRF 250 R

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04 crf 250r.... the head has a chattering noise when running

The bike ran fine until my right intake valve clearance zeroed out on me, it was not adjustable anymore so i put a new valve in it. I put the head back on once the new valve was in, lined eveything up, made sure the valve clearances were right and made sure the timing marks were lined up correctly. When i tried starting it i noticed that it kicked over harder then usual almost like it was not timed right. When it started up it made a noticably loud chattering noise coming from the head. The bike idled and reved fine except for the chatter. Long story short I triple, triple checked everything the timing, valve clearances, put a new cam chain guide in, i even took out the hot cam and put the stock cam back in. The cam chain is newer it only has a handful of hours on it. I cant shake that chatter noise.....maybe the cam retainer rings in the holders?? Help

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  • holtnj Jun 23, 2009

    spring is new with the valve , thrust washers are there, the bearing could be bad. I have never changed the bearing before that could be the weak link. Thanks!!

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Any chance the valve spring has collapsed? Cam shaft thrust washers missing? Cam shaft bearing gone bad?
04 crf 250r.... the head has a chattering noise wh - abe5193.gif b3c3550.gif Please rate this solution. Thanks!

Posted on Jun 22, 2009

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Set your cam chain tension

Posted on Aug 12, 2009

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You did not mention that you had a valve job done. When replacing a worn out valve you also have to re-cut the old valve seat (multi-angle valve job) to match the new valve. Since you only replaced one valve it sounds like a patch job that proper rebuild would have fixed.

Posted on Feb 17, 2010

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Hello


No you shouldn't have to get them adjusted that ofter by no means......have to changed spark plugs lately......run any carb cleaner through you motor such as seafoam (found at autozone or advanced)? anyway thats what i would do before i adjusted the valves again

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New rebuild chatters


adjust your valves your oil pickup tube needs to be adjusted you need feeler guages to adjust the valves down properly
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feeler guage is---> thin pieces of metal cut to different sizes to hold under valve adjusters till the play and chatter gone
check by book what the feeler size needed for adjustment

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