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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Has Anyone Ever Bench Tested a B-TH Electronic Mag With Coils
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<blockquote data-quote="CarlHungness" data-source="post: 173166" data-attributes="member: 2517"><p>My first thought when my bike wouldn't start last year was one of the B-TH coils went bad. I replaced the coils this year and failed to start the machine. I switched to my old Lucas. Still couldn't start it. Bench tested the Lucas and it sparked. I re-installed it, still won't start. After all of this I've had the timing chest off twice, exhaust pipes too, etc. Finally today I dug out the B-TH bench tested it with a hose on its nose, turned the drill ever-so-slowly and got great sparks from the B-TH!! Then I tore into the carbs, took the jet block out of #2, all looked OK. Then moved to #1 and found the very tiny hole (.0021) to be clogged. The reason I state this figure is because I had a piece of copper wire with that diameter and it seemed to fit the hole perfectly. My drill chart says .0021" is a #75 drill, not one you'll find in a normal drill index. Thus I think I found my problem and will try and start the machine on Monday as the carbs are leaking and need new gaskets. I tested the B-TH with the new coils and the spark is fabulous. I could count the revolutions the drill was turning, so it was extremely slow. Maybe the original coils offered less visible spark, but I am over the moon that I found the jet block hole clogged.</p></blockquote><p></p>
[QUOTE="CarlHungness, post: 173166, member: 2517"] My first thought when my bike wouldn't start last year was one of the B-TH coils went bad. I replaced the coils this year and failed to start the machine. I switched to my old Lucas. Still couldn't start it. Bench tested the Lucas and it sparked. I re-installed it, still won't start. After all of this I've had the timing chest off twice, exhaust pipes too, etc. Finally today I dug out the B-TH bench tested it with a hose on its nose, turned the drill ever-so-slowly and got great sparks from the B-TH!! Then I tore into the carbs, took the jet block out of #2, all looked OK. Then moved to #1 and found the very tiny hole (.0021) to be clogged. The reason I state this figure is because I had a piece of copper wire with that diameter and it seemed to fit the hole perfectly. My drill chart says .0021" is a #75 drill, not one you'll find in a normal drill index. Thus I think I found my problem and will try and start the machine on Monday as the carbs are leaking and need new gaskets. I tested the B-TH with the new coils and the spark is fabulous. I could count the revolutions the drill was turning, so it was extremely slow. Maybe the original coils offered less visible spark, but I am over the moon that I found the jet block hole clogged. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Has Anyone Ever Bench Tested a B-TH Electronic Mag With Coils
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