gm coils on an xs650

crazy...,

Most of those dual output coils are HEI coils with a very low primary resistance that would fry the TCI transistor. Measure the primary resistance of one to see. Must be 2.5 Ohms for the TCI.

mrriggs is the expert on using GM HEI coils, so perhaps he will arrive and provide more information.
 
I think some of the 80s 90s GM coils like off a cavalier are in the right range but the spark isn't all that hot. They are CHEAP though. Some of the KZ1300 guys used em. But the accel 140403 were much more popular and IIRC the primary is 2.4 Ohms.
 
Check eBay for replacement Harley coils, they're a dime a dozen on there. I got a nice Accel 4.2 ohm when I had points for about $15 and later, after I switched to a Pamco, a nice red 2.8 ohm Andrews for about $25. Both were brand new, never used and found on my 1st search attempt.

Coils.jpg
 
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