I'm getting no spark on my right cylinder.  Removed the spark plug and held it to engine case while cranking to look for a spark.

-It isn't the plug (new and clean and correctly gapped)
-it isn't the coil (switched wires from left coil and it then worked, also swapped with right coil off my other fully-functioning GS and still didn't spark),
-it isn't the Ignition Control Module (switched with ICM from my other fully-functioning GS and still didn't spark, and current one is a new-ish replacement off ebay for $80 after old one failed to spark - starting to think the original one wasn't the problem then either  wasted $80 n trashed the old one).

Is there something I might be overlooking that affects the spark?!  My only other guess is that the wiring harness has a break in it somewhere, or a bad ground.  Please help!??!!

On the other hand, it starts right up and revs Great on one cylinder! 

Check the connections in the wire harness. It is common for the GS's wire harness connectors to corrode. I had a similar problem and it fixed itself when I pulled all the connectors to apply electrical grease.

Crank trigger.
And that's gotta be a GS250 and its not the worlds first, I have had several.
BTW also check your auxillary ground they corrode and look like its making contact and its not ... I have twisted the tounge and made better contact on ocassion. Those 2 are the only ones left.
Cool.
Srinath.

Try checking the electrical plug that's hidden under the gas tank  :

http://gstwins.com/gsboard/index.php?topic=32547.msg361433#msg361433

This plug worked its way loose on me before.

You might also have a damaged wire, the wire colors for the coil are BY(black/yellow) and OW(orange/white) and should both eventually lead back to the igniter, but have to go through one molex connector

I believe that these coils are grounded via the tab they mount with( ) so check what they press against, but someone might no more about this

Quote from: Smokebombb on January 18, 2007, 09:45:59 PM
Try checking the electrical plug that's hidden under the gas tank  :

http://gstwins.com/gsboard/index.php?topic=32547.msg361433#msg361433

This plug worked its way loose on me before.

thanks for contributing, but nope - this isn't the sollution, that was the first thing I checked, I even stated that I swapped out the entire coil for one off my other GS - still didn't fire - I guess I'll just have to dig deeper - thanks anyway