Question about 2002 Honda CRF 450 R

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I been problems starting my 2002 CRF 450R so i checked my plugs which were good and my compression, but when i checked my compression it was 0. i have no compression. this bike has a after market cam and exhaust but other than that its stock. could this be the valve shims arent set right causing the valves not to seal and leak compression? the bike will start if you push start it but it will not start if you kick start it.

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  • Honda Master
  • 3,295 Answers

If you have no compression then yes id recheck the valve clearances before anything else

Posted on Jul 13, 2017

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abe5193.gif b3c3550.gif Please rate this solution. Thanks!

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Posted on Jul 11, 2009

bozcro
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SOURCE: same problem hard to start using kick start

sounds right, but shims dont really wear the valve sits in or the lobe wears, hence the need for re-shimming

Posted on Jul 22, 2009

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SOURCE: are there 2 locations for a 2005 crf 450r vin

vin nos are usualy located on a metal plate riveted to the steering head or down tube however they are often stamped directly into the steering head

Posted on Feb 23, 2010

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I am beginning to have a problem starting my 2002 Honda 450R. I replaced the old gas, jets. Should I look at valves, piston?


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What type of coolant for my crf 450R 2002


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Sep 08, 2010 | 2002 Honda CRF 450 R

1 Answer

Hard starting


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

Mar 07, 2009 | 2002 Honda CRF 450 R

1 Answer

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