Maintenance & Technical > KX450F / KX250F

ECU not working

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ID KX500:
I thought I'd post a 4 stroke issue I'm having with my 09 EFI 450F. With EFI being fairly new not as much information exists as say carburetor problems.
Last fall my 450 quit on me and wouldn't start. I pulled off the tank and examined the wiring,, not seeing anything in particular wrong I put it back together,,,,kick kick it started right up and it was running fine again. So I took it on a longer ride with the wife she was riding the Polaris850 atv. 12-13 miles in and it just quit dead as a door-nail,,,, fortunate for me I wasn't alone,,, we rode back to the pickup and retrieved the bike. Not knowing where to begin on finding the problem I took it to the nearby Kawi dealer for analysis. For a very reasonable fee they said it appears to be the ECU. OEM is around $340. I found a used on ebay for $108 shipped. 

The seller warned me that a person he knew had this problem and blew out a brand new replacement ECU before discovering a wiring short. So just to be safe I checked ebay for a wiring harness. I plan to check the wiring for a short first but I'll most likely just replace what I have with a different one that is on it's way here. I'll post the results and what I find for anyone who may run into this.

I still believe EFI is the cats pajamas. There is a possibility the wiring was compromised by the Christini install.

Motorrad:
Hmm very interesting.

I know with automotive stuff... if the system isnt grounded EXTREEMLY well.. it drives the ecu stuff insane...

alward25:
had the same problem on my klx 450, the stator wiring connector gets water in it real easy.  I blow it out after every ride/wash and it does much better.  Something to look at of you have not.

ID KX500:
Thanks Motorrad and Alex. That is something to look at too. I read of a similar problem (on an efi kx) stemming from the wiring coming out of the stator, it was shorting out there.

Ims Roll:

--- Quote from: alward25 on February 26, 2013, 06:09:44 PM ---had the same problem on my klx 450, the stator wiring connector gets water in it real easy.  I blow it out after every ride/wash and it does much better.  Something to look at of you have not.

--- End quote ---
not to highjack but what kind of problem was the stator wiring connector when it got water in it?

Personally i would go around your 450 and make sure every bolt on your wiring is tight, be surprised sometimes when EFI acts up and you just tighten a bolt to fix it. would make sure you have no wires pinched that have wore through to expose the raw wire (under the tank area maybe, by the pipe) bare with me i don't own a EFI one.

I'd give that a shot before buying someone else s problem, your issue could be common with the EFI bikes and his harness may have the same issue you haven't found yet.

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