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Dirtbike Performance and Tech Wrench on it and make it faster - Or just get it to start.

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post #1 of (permalink) Old 07-07-2009, 10:59 PM Thread Starter
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Location: tracy ca
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honda xr 100

well I got my daughter a 1999 xr 100. first time out she was learning to ride and I am pretty sure she ran at near full throtle in first gear for a bit too long.
The thing still runs and has compresson. how much I dont know. but the kick start still feels about the same.
she rode it to me saying its making a new noise. I checked and the oil level was a bit low. added about half a quart with no results.
the sound is like an exhaust leak type. consatant threw out the RPM band.
the sound also reminds me of a sticky lifter in a car only a bit more tinney.

any ideas? I am brand new to bike engines but defintaly have a good amount of experince on 4x4 truck engines trannys and T cases.

thanks for any and all help!

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post #2 of (permalink) Old 07-14-2009, 10:37 AM
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Air cooled bikes make all kinds of top end sounds -- the cooling fins amplify whatever noise come from the engine. It's tough to say without actually hearing it. If it's loud to the point that it hurts your ears when it's running, & is difficult to carry a conversation over, then that could be a problem.

It may have just got so hot from running around in first gear, that the heat combined with some crappy oil amplified the noise. Excessive heat will make the valve clearances a bit wider than at normal operating temperature, which can result in the tapping noise you described.

I have had good luck making ticking valves quieter using Amsoil 10W-40 or 20W-50, depending on average air temps. As long as the valve clearance is within spec, an oil change might take care of it. I'm not an Amsoil salesman -- I've just had great results with it on more than one occasion.
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post #3 of (permalink) Old 07-20-2009, 01:19 AM Thread Starter
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I took a look inside and found that the nut for the tappet had came off causing the vavle to be way out of adjustment.
put it back together and all is well now.
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