Thread: Fuji weak spark... Flywheel???
04-12-2009, 09:03 AM #1
Fuji weak spark... Flywheel???
I am working on a '95 SL 650. It has extremely weak spark, it will jump about .010 with the caps removed. Stator tests good on ohm meter, one coil tests bad, all caps test good. I eliminated the bad coil and tested again, same result extremely weak spark. I switched out the cdi with a known good one, same result. I suspect the flywheel to be weak or damaged in some other way. Have any of you run in to this problem before? I ask because I have not, but I haven't seen everything, yet...
04-12-2009, 10:03 AM #2
- Join Date
- Jul 2007
- near Toronto, Canada
Click here for the Polaris Service Manuals, and other useful info.
Did this machine used to work fine?
No parts have been changed co-incident with the weak spark problem occurring?
04-12-2009, 11:25 AM #3
thanks, I don't have any previous information on the machine. I have a SELOC manual for the unit, and it appears to be a verbatim copy of the polaris manual in the listed link.
On a side note, there is debris damage on the top of the front piston, looks like maybe a broken ring, reed cage screw, or rod bearing coming apart. When activated, the starter, bendix, flywheel, or crankshaft make a funny sound. It sounds like whatever made the damage in cylinder is still in there.
Initially, I thought that whatever has happened in this cylinder would not cause a weak spark condition. Consequently, I continued to troubleshoot the ignition, to where the only thing left is a fly wheel.
Maybe the Mag bearing heated up and shot the ball retainer through the crank seal and caused some havoc in the Mag housing. I think that is a very outside possibility for that kind of damage to happen. Therefore, I did not think it was worth mentioning in the first post.
Last edited by XSKIER; 04-12-2009 at 11:29 AM. Reason: added
04-12-2009, 11:28 AM #4
I think its time for a teardown and inspection.
Welcome to the hulk...
04-12-2009, 12:07 PM #5
- Join Date
- Oct 2006
- Cleveland OH
Welcome to the Hulk X.
Have you tried removing the plug caps and cutting the wires back about 1/4" or so to expose clean wire?
This sometimes helps with a better spark.
You can also consider higher PRO 785 coils to boost voltage. If interested, I have a new set for $60.
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