Question about kawasaki KX 450 F Motorcycles

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Kxf 450 motocross. bike will not kick up. its had new piston and rings,valves adjusted(spot on)new stator coils. starts (just) if you bump it. it had this problem before it had the new parts. i am pulling my hair out over this.any advice would be greatfully recieved. cheers.

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Check the ignition module yet? It sounds like the problem your having. If no spark is getting to the spark plugs with everything new installed that is your proble if all fuses are good

Posted on Jul 07, 2010

  • kevmx2003 Jul 07, 2010

    hi, thanks for speedy reply. there is a spark . no fuses as it is a mx bike. kick start only ,no electric start. cheers kev.

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Assuming it all back together correctly as you had so much practice now I sure all your timing set correct and your valves clearance are all spot on
There is a few things I would be attempting firstly being its virtually brand new motor I would be checking your stator with multimeter testing its resistance readings - let me know if you want info on this ?
if the stator all good then I would be suspicious of the CDI unit especially as you have cooked motor beneath it the heat could have killed it ?
if these two theory fail then your next option would have to be leak down test to confirm your new head is sealing valves in it are sealing and you not losing compression past the rings
From what you have written I would be mostly concerned with electrical side first Dont be fooled either just because spark plug has a spark does not mean stator and CDI are correct?
have you tested kicking over with spark plug laying on head bolt or something is it sparking at all?
regards Jamie

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maybe get a new spark plug.make sure your grounded(earthed). did you take the plug out and check for spark against the motor while you cranked the bike over?

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THE STATOR PLATE HAS A LINE ON IT (CENTRAL TO THE LEFT BOLT SLOT) WHICH SHOULD ALIGN WITH THE POINT ON THE CRANKCASE, IT SHOULD ALSO BE DEAD CENTRAL TO THE BOLT/SCREW HEAD. THIS IS SUZUKI'S RECOMMENDED TIMING POINT. ANY STARTING PROBLEMS MAY BE DUE TO OVERUSE OF THE CHOKE, RM'S EASILY FLOOD, IN WARM WEATHER I RARELY USE IT, IF I DO- ONLY FOR A COUPLE OF KICKS THEN STRAIGHT OFF IF IT FIRES. THE CORRECT PLUG IN GOOD CONDITION IS ESSENTIAL- NGK B8EGV WHICH I REPLACE REGULARLY. A WEEPING FLOAT NEEDLE VALVE CAN ALSO CAUSE PROBLEMS, HOPE THIS HELPS, WILL.

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Do a compression check. It should be 120lbs or above. Check the compression release. Is it closing fully? Burned valves may be at play here also. Bad piston rings or seize scars on the cylinder wall? If you need a service manual you can download a free PDF from the site below.

http://www.carlsalter.com/motorcycle-manuals.asp

Please rate this answer. Thanks ellismd79!

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1 Answer

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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

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1 Answer

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