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Old 07-12-2011, 04:36 PM   #1 (permalink)
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300ex timing

hey i just bought a 300ex they said it jumped time i put it back in time and it ran good just smoked like crazy(then jumped again) so i bought a new cam sprocket and new valve rubbers but now the chain wont fit on the new sprocket all the way (wouldnt fit all the way on the old on either) but it fits the botton timing cog perferct so im thinkin im in for a chain and as far as the smokin the piston and rings look perfect so should two new exhaust valve rubbers fix that thanks in advance
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Old 07-12-2011, 08:08 PM   #2 (permalink)
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Welcome to the forums.

What year???
Did you perhaps forget to loosen the timing chain tensioner?
here is the 01-06 service manual
01-06_TRX300EX_service
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Old 07-12-2011, 08:25 PM   #3 (permalink)
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Welcome to the forums. If it keeps jumping time and the chain doesn't fit the teeth of the sprocket good, the timing chain is likely stretched.
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Old 07-12-2011, 09:48 PM   #4 (permalink)
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agred^^^^^ timming chain needs replacing.
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Old 07-14-2011, 05:45 PM   #5 (permalink)
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but the chain does seem to fit the bottom cog good just not the top and its a 2000
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Old 07-14-2011, 06:10 PM   #6 (permalink)
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Quote:
Originally Posted by hondaman0 View Post
but the chain does seem to fit the bottom cog good just not the top and its a 2000
That doesn't matter. If it keeps jumping time, the chain is stretched or your chain tensioner is bad or both. More than likely, the chain is stretched.
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Old 07-15-2011, 03:33 PM   #7 (permalink)
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k thanks alot
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