Question about 2005 Honda CRF 450 R

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2005 CRF450R Hard to start and wont idle

Bike was running great a few days ago. Now its very hard to start and I have to pin the throttle to start it now. Once i start it it runs great at low speeds as well as high but it wont idle unless i turn up the idler and then when i shut it down its still hard to start even when its warm. I changed the spark plug and checked the compression everything seems fine. I know nothing about valves but everything looks and feels tight?????

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  • tito sanchez Mar 04, 2009

    I emptied the old fuel and checked the fuel filter inside the tank and put new gas. also used right spark plug and gapped it correctly. Problem started before changing spark plug.

  • tito sanchez Mar 04, 2009

    also the air filter is clean.. I ve got nothing so any suggestions would help. thanks.

  • joe May 11, 2010

    did the problems start soon after a fill up with gas?

    did you use the right spark plug and gap it as required? did the problem start after changing out the spark plug?

    how does the air fiter look?

  • yotam_g
    yotam_g Jan 02, 2012

    i have the exact same problem on my 05 CRF450x. except for checking the valve clearance, i did everything; air pilot, pilot jet, main jet, drain jet, jet needle, cleaned the whole thing twice, replaced the fuel, changed the spark plug (NGK IFR8H11).

    nothing changed...:-(



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I would suggest that you have the valve clearances checked.

Also, check that the carb is clean. Pay particular attention to the PILOT JET as this opperates the idle circuit.


Posted on Mar 05, 2009


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