Rebuild Top End - Page 2 - Honda ATV Forum
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post #11 of 15 (permalink) Old 06-06-2011, 02:40 PM
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It was running good before you rebuilt it you mean,or it was running good earlier before you messed with the timing???It will not run if the cam is off timing at all,if you're 180 degrees off it might backfire through the carb but won't run...You have to find the correct TDC mark as at the other time it is at tdc of a stroke will it be out 180 degrees...

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post #12 of 15 (permalink) Old 06-06-2011, 02:42 PM
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On the 250EX, you don't have to mess with the timing to rebuild the top end. The 250EX is a push rod engine, with the cam in the bottom of the engine.

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 #13 of 15 (permalink) Old 06-06-2011, 02:53 PM Thread Starter
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I'm trying to set the valves
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post #14 of 15 (permalink) Old 06-06-2011, 02:56 PM
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Are you saying that it was running good and then you tried to adjust the valves and now it won't run? If so, did you set the valves with the piston on TDC on the compression stroke and not TDC on the exhaust stroke?

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 #15 of 15 (permalink) Old 06-06-2011, 03:00 PM Thread Starter
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I rebuilt the top end while putting back together I tried setting the valve clearence because I had the valve seals changed while apart
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