Weak spark on Hard starting '05WR. CDI?
Posted October 20, 2007 - 08:31 PM
Using my sons "03 wr250 , I think I have isolated the problem to a weak spark. When I test for spark on my 450, all I get is a single spark when I hit the starter button while grounding the plug against the motor. When I do the same thing on the 250,(450 plug and coil) it repeatedly sparks bright just like you would expect. I tried the 250 coil and plug on the 450 and same thing, a single spark, then nothing. The plug is gapped correctly. From what I have been able to come up with searching this forum, I may have a bad CDI.
Does this sound like the problem? Can I use the 250 CDI to test? If I need a new CDI, what years are compatable?
Any help would be greatly appreciated.
Posted October 20, 2007 - 10:19 PM
BTW - your starwars avatar cracks me up!
Posted October 22, 2007 - 06:38 PM
Posted October 23, 2007 - 09:52 AM
Posted October 23, 2007 - 07:00 PM
Posted October 25, 2007 - 08:39 AM
Help me out here, the stator is some type of alternator so wouldn't this simply cause a problem in the charging circuit? I'm not positive that the charging system is working but regardless of that, the battery is fully charged and I still don't have the proper spark. Do the Baja kit problems have the ability to affect the spark and or CDI? Should I contact Baja and ask them? Should I try the stock rectifier and see what happens?
Posted October 25, 2007 - 12:20 PM
The stator has come lose from inside the stator cover and got seriously chewed by the assembly. It's toast and there are metal shavings everywhere.
Other than replacing the obvious parts, are the shavings a big concern?
Posted October 25, 2007 - 12:38 PM
I would clean the oil strainer and change the oil and filter after each ride for a while.
Posted October 25, 2007 - 04:34 PM
Posted October 25, 2007 - 09:57 PM
Posted November 02, 2007 - 07:11 AM
My worries about stator metal polluting the engine are very valid. I didn't find anything in the oil strainer, but there are lots of fine metalic shavings in the filter.
Other than changing the oil and filter until I quit seeing metal, should I do anything else?
Thumper Bloke, thanks for your offer to test the CDI.
Posted November 04, 2007 - 10:07 AM
I've seen the bolts for the starter gear (bolts that go through the flywheel and into the gear on the back side) back out and tear the stator apart as well.
There's a pulser coil that's part of the stator and tells the CDI when to fire. If that's tore up, good battery or not, she wont run.