Maintenance & Technical > KX450F / KX250F

06' 450F Hard to Start

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FPMXer:
You can order the plugs off www.sparkplugs.com if your local shop don't carry the correct plugs. The wrong plug could cause damage to any motor.

Scott Marks:
Just thought I would give you an update.  Set the valves and put in the correct spark plug, still the same.  I took the bike to the Kawi dealer and they have been working on it most of the week.  All electical components check out o.k. they even took the CDI off of another bike and nothing. Only backfires.  Kawi tech support says it's electrial and to check the timing with a timing light.  They can't get the timing light to work because they feel the spark output is to low.  Makes no sense to anyone especially given the stator, coil, CDI, and other components check o.k. Our next step is to take all the electrical components off a running bike and see if that makes any differnce.

I let you know!

hughes:

--- Quote from: Scott Marks on January 31, 2007, 11:48:12 PM ---Just bought an 06' 450F, because the guy was having trouble kick starting.  Push it and it takes right off, but won't kick start.  He has has the head rebuilt with new valves & checked nearly all the electrical.  He thinks there is a problem with the wiring harness.  I am taking a simpler road, starting with the carb and checking all the basics and mainly cleaning to ensure there is no trash in the carb.  I took the Pro Circuit T-4 pipe off (which is for SALE at a resonable price) and put the stock pipe back on. Starting with all stock jetting, settings, and installing all new hot start components. Just wondered if anyone has any tricks or things to look for.

Thanks,
Scott

P.S. Make me an offer on the Pro-Circuit T-4 header & silencer

--- End quote ---

Sounds odd to me that it will push start and run but won't kick start and run, hard to believe that's is an ignition problem. Hope they figure it for you.

5dracing:
This is so off the wall but it happened to me. Check the pipe and see that it is not blocked up. I had a '76 YZ25 that I did some work on and the guy brought me a pipe and said he wanted it put on after the rebuild. Long story short, put it on and the bike would not kick start. If you pushed it it would try to run. I found a mouse nest in it. Burned that out and it worked fine.

Scott Marks:
It runs great when you push start it. Does the same with the Pro-Circuit exhaust & the factory exhaust.  Sometimes it will kick start, but more times it won't. I am taking my buddies 450 to the dealership in the morning and they are swapping the electrical components. Tonight I am thinking the gear position sensor really needs to be looked at closely, given this is the only component that changes the ignition timing.

I will keep you posted.

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