Question about 2002 Honda CRF 450 R

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Hard starting my 02 crf 450r will start but only when you bump it into gear when you try to kick it won't kick over. so i had a guy look at it and he said that he could push the lever down with his hand and said for sure it needed a new piston kit and the valves seats were about to go. any answers thanks.

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  • goldenboner0 Mar 08, 2009

    i had the guy inspect the valves and he said that the bike has been shimmed so many times that it could not be shimed much more. and the guy also said that the head would last to much longer either. so yeah any recomendations.?

  • joe May 11, 2010

    i would do a compression check on it first before tearing into it. maybe also a leakdown test (some of the better compression checkers have this feature) to see if its a valve or pistion ring problem.



    if it was a compression issue, then i think it would not start either way (kicking it or bumping it).



    if the kick lever goes all the way down with no effort, then i would think the splines are stripped inside the transmission/engine or just stripped where the lever meets the shaft on the outside.

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  • 46 Answers

Hi,

You need to inspect the valve clearances. It is common for the intake valves to wear a little.
Inspection of the clearances should take place at 15 hour intervals if you are racing the bike.

When the valves leak, the bike does not maintain compression and kick starting becomes tough. The fact that the bike starts when being bumped, shows a loss of compression.

An easy DIY compression test is to remove the spark plug, place a finger over the plug hole and press down on the kick start lever. The air should be forced past your finger at a high rate and you should hear the air escapeing. You must not be able to prevent any air from escaping.

Good luck

Jon

Posted on Mar 09, 2009

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