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post #1 of (permalink) Old 07-22-2001, 01:44 PM
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timing jumps off

We own a 88 honda trx250x,had a valve job done recently,took apart my self,sent head out,haed came back,I put back togetther,At first I used the wrong timg mark to set the cam sprocket(the mark had two lines fairly close together(ll)It was not the t mark.later I corrected that by finding the T mark.Now she runs for about an hour then runs like crap until I reset the timing and it starts all over again.There is a head cover bolt that was stripped prior to me buying the machine but I think I have corrected that problem.I should mention that before the valve job the cam chain fell the sprocket that is what started this hole project


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post #2 of (permalink) Old 07-31-2001, 08:56 AM
 
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Re: timing jumps off

i dont know the answer but im just topping it for you

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post #3 of (permalink) Old 07-31-2001, 08:08 PM
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Re: timing jumps off

i dont know everything about four strokes but the cam not being right probably will throw of your timming

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post #4 of (permalink) Old 07-31-2001, 11:58 PM
 
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Re: timing jumps off

OK with what you stated, when you had the valve job done, did you also replace the chain and gears? sounds like the chain is worn and stretched and the teeth on the gears may be rounded enough to allow the chain to jump maybe one spot each time....

replace the gears and chain...and make DANG sure the marks are matched up BEFORE you start it!!! It is very important, especially with new parts...you can screw the valves and require another valve job because of it...



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post #5 of (permalink) Old 08-01-2001, 04:20 AM
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Re: timing jumps off

thankyou quadzilla08,I will check the cam.

post #6 of (permalink) Old 08-01-2001, 04:25 AM
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Re: timing jumps off

thankyou airborne,I will check the chain and the lower gears.top cam sprocket is new.yes the timing marks are se perfect.thanks again

post #7 of (permalink) Old 08-01-2001, 08:15 PM
 
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Re: timing jumps off

when you replace timing chains, ALWAYS and i mean ALWAYS replace both gears at the same time...do NOT make it a practice of replacing one and not the other.....i would be inclined to put money on that being your problem knowing that .....

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