This is a simple 2 cylinder wasted spark system and both plugs always fire at once. The fixed (stator) ignitor coil is a single winding if I recall so one cylinder cannot have different spark timing from the electrical end of things. Could look at the rotating magnet end of things in the flywheel, I suppose. Could have a bit of metal stuck in there extending one magnet's field forward.

The only other things that can make one side detonate and not the other is unique leaner mixture, different squish angle in head, more compression or more actual advance from the crank throws having shifted from each other. I have heard of the last one happening in a very few rare cases.




Chuck





From: Chris Reinhardt <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: [F500] Help I don't know what to do anymore
Date: Sun, 24 Sep 2006 14:45:14 -0700 (PDT)

John, I'm very familiar with 2 strokes and ignitions, not very much so with the F500 plants, but all applies, and I'm sure I will be corrected, but... How does that ignition layout, is there anything that's separate from one cylinder to the other? I'm thinking more like a bad CDI unit or stator coil...

  CR

John Vriesinga <[EMAIL PROTECTED]> wrote:
  > John, if you're melting electrodes, I would sugest ignition woes...

Are you thinking there is a spike in the current? What should I change?

JV
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