300ex timing - Honda ATV Forum
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post #1 of 7 (permalink) Old 07-12-2011, 04:36 PM Thread Starter
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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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post #2 of 7 (permalink) Old 07-12-2011, 08:08 PM
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Garage
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

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_

Last edited by TRX2fiveO; 07-12-2011 at 08:11 PM.
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post #3 of 7 (permalink) Old 07-12-2011, 08:25 PM
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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.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #4 of 7 (permalink) Old 07-12-2011, 09:48 PM
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agred^^^^^ timming chain needs replacing.

'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho
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post #5 of 7 (permalink) Old 07-14-2011, 05:45 PM Thread Starter
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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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post #6 of 7 (permalink) Old 07-14-2011, 06:10 PM
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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.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #7 of 7 (permalink) Old 07-15-2011, 03:33 PM Thread Starter
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k thanks alot
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