Question about 2003 Honda CRF 450 R

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Ive recently got my hands on a 2003 crf 450 and carried out a service when i got it i.e gear and engine oil, plug, filter chain and sprockets etc. when the bike is cold its impossible to start, weve even heated the plug up, when i bump start the bike itl kick over first kick everytime when its warm. But it runs really hot, i had the rad water bubble over on me the other day after about an hours riding. i put it back in shed, went to start it again and 300 kicks later it still wont start, but it will if i bump it. HELP!!!!!!

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I assume you mean pulling the bike and spinning motor over that way? have you cleaned carburetor? jets are very small so any build up effects performance greatly. also check carb to engine mounting gasket for sucking air. this will make it hard to start cold. i would run a compression test also if you have low compression this will make it harder to start kicking and the faster spinning of engine on bump start build more compression. as far as running hot be sure radiator fins are all clean of dirt. they can build up with mud and will not let airflow across it. might wanna pull rad off and hose out look inside see if it has build up on the flutes.

Posted on Jun 07, 2010

  • 1 more comment 
  • scottengland Jun 07, 2010

    What sort of compression psi am i looking for to be right and do think valves are anything to do with this, what are the cold valve clearences for this also? thanks

  • TripleTauto
    TripleTauto Jun 07, 2010

    ANOTHER POSSIBLE START PROBLEM COULD BE THE COMPRESSION RELEASE CAM this bleeds off some compression to make kick starting possible.

    check the adjustment on the compression release arm. It is the arm on the right side exhaust valve with the adjuster and lock nut on it. After you check and adjust your valves, check and adjust the compression release arm to .014 clearance at TDC. If this adjuster has too much clearance, the bike will be hard to kick. the valves should be .19mm clearance if they are too tight will lose compression

  • TripleTauto
    TripleTauto Jun 07, 2010

    best way to check compression would be to do a leak down test. this is done by applying air to cylinder with valves closed and see if you have air escaping. if you hear air coming out carb then have a intake valve not seating out exhaust you have exhaust valve problem. i believe compression is issue with kick starting problem.

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Zooming link for Remove the jackshaft sprocket-4.0L SOHC Engine 2000-2001

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