Yep,GS500.I got four total but if I find the right deal,I'll have more.
Crazy idea but do you have a timing light (car type strobe light)? Clamp it around a plug lead and rev the bike up and down and see if the strobe misses beats or if it's steady when the motor coughs.
What I'm trying to come up with is a cheap way to prove that it's electrical.
If it does miss beats, then the next question is it a partial break in a wire or a short between a wire and the chassis somewhere - or maybe it's a broken plate in the battery. Try a different battery and see if it makes a difference.
I don't have a timing light any more.I did change the coils and it got better but not completely.It doesn't do it when free rev'ing.It only does it under load.Hot or cold engine temps doesn't seem to make much of a difference.I added my 5 degree ignition advancer and the miss went down in the rpm range.Now it misses between idle and 2000 rpm.I checked the plate that the ignition pick ups are on.There's no loose connection and the GS has no adjustment in there.However,I did notice that one pick up is almost touching the rotor and the other has about a 1.5mm gap.I don't know how this could be unless the case cover was cast or machined slightly off center.Could the air gap be wrong and causing my issue.It seems to be random and on both cylinders.
On the battery comment.I have a new (well three months old now) Scorpion AGM battery.I really don't thing it's the problem.The plates don't float in an acid bath.Excuse me,electrolyte solution.LOL! I was told recently that I need to be more PC. ROFLMAO!
Here's what I did do.
Changed the coils to a set that was known to be in good running condition.
Replaced the spark plugs with a new set gapped to .028.Service manual says .028-.031.
Checked and cleaned all connections.Not just the connections at the coils.
What should the minimum voltage at the coils be with the ignition on and engine off?I read 11.7v for a waste spark system.Is this correct?I feel more comfy if mine was above 12v.I haven't check this yet,because my manual doesn't give any specs.The coil and pick ups check fine with a multi meter.Maybe I should check them again since the weather has cooled off.My manual says that the readings for the pick ups should be taken at a temp around 68 degrees.I took the readings with an air temp of around 88 degrees.I'm sure the bike was cooler setting inside my building out of the sun,but still not close to 68 degrees.
Just had to (brag)
add this.I know it's not gonna cure my ignition problem.My bike does feel like it's geared a little to high so I ordered a JTS steel 15t output shaft sprocket.That's down from a stock 16t.Scooped that baby up for $14.95 shipped.Cheapest I have ever found it online.New seller to me,on Amazon, so I'll wait until my sprocket arrives before making any recommendations.