06-05-25, 01:42 PM
Update on this thread.
I think I’ve ended up with more than one fault contributing to this misfire.
High resistance plug cap was rectified but still misfiring.
Further investigation through the wiring and checking of some of the well known problem areas showed up an issue with the ignition switch. When in the ON position the resistance was fine but merely touching the key gave much higher resistance so clearly a problem. I decided to strip it down which wasn’t so hard, I’d had it off before so the anti-theft bolts were already replaced. To get into the switch there are 2 other anti-theft screws, I managed to remove with a small drill and easy out. They were not very tight. Replaced with cap screws.
Inside there was some tarnishing of the copper contacts, cleaned up and put back together showing perfect continuity now even with pressure on key.
Coils, pick up coil, tip over switch and other interlocks all checked out good / within spec.
Now need to test again but I believe vibrations when riding would replicate the pressure on the key which could lead to an intermittent issue.
Appreciate the assistance from unfazed on various emails.
I’ll update further once I’ve tested.
I think I’ve ended up with more than one fault contributing to this misfire.
High resistance plug cap was rectified but still misfiring.
Further investigation through the wiring and checking of some of the well known problem areas showed up an issue with the ignition switch. When in the ON position the resistance was fine but merely touching the key gave much higher resistance so clearly a problem. I decided to strip it down which wasn’t so hard, I’d had it off before so the anti-theft bolts were already replaced. To get into the switch there are 2 other anti-theft screws, I managed to remove with a small drill and easy out. They were not very tight. Replaced with cap screws.
Inside there was some tarnishing of the copper contacts, cleaned up and put back together showing perfect continuity now even with pressure on key.
Coils, pick up coil, tip over switch and other interlocks all checked out good / within spec.
Now need to test again but I believe vibrations when riding would replicate the pressure on the key which could lead to an intermittent issue.
Appreciate the assistance from unfazed on various emails.
I’ll update further once I’ve tested.