Question about Yamaha XS 650 F Motorcycles
Since you did 99% of the troubleshooting already so I can only put in few items that someone may overlook on a motorcycle.
Check the CDI module contacts and cable connections.
Grounding between CDI box to frame.
While you at it,why not continue ground this wire to the stator and frame.
Have you check the condition of stator laminated magnetic wire?
Check for hot spot(s) near stator and CDI box.
Do a tap/wiggle test. Use a small screw drive and tap/wiggle all wire harness on the bike.
Take the air filter out for a short test ride.....this will rule out the air restriction.
I hope you are not using a stock air cleaner (not K&N oil type filter)
Got fresh gasoline?
If the engine is modified for higher compression then I will try fuel with one higher RON octane rating.
You did not post the year. If it's a 80's + model. You may have few electronic solenoids to look into.
The last thing.
Open it up and RIDE!
Posted on Jul 28, 2009
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Posted on Jan 02, 2017
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