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Post by mraxl on Mar 17, 2023 13:15:34 GMT -5
Going back to when you tested red wires for AC volts..... you indicated that there was little or no voltage there when kicking it over. If the CDI boxes are good there should be about 100 vac or better. The only components involved are pickups, low spd coil and cdi. If CDI is good and pickups measure about 200 ohms and lo spd coil measures 200 ohms then the most likely cause of failure is bad grounds. Engine must be grounded, CDI box must be grounded.
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Post by kawonda750 on Mar 17, 2023 13:17:32 GMT -5
Tried it. Nothing. This is the third stator btw.
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Post by kawonda750 on Mar 17, 2023 13:41:39 GMT -5
Going back to when you tested red wires for AC volts..... you indicated that there was little or no voltage there when kicking it over. If the CDI boxes are good there should be about 100 vac or better. The only components involved are pickups, low spd coil and cdi. If CDI is good and pickups measure about 200 ohms and lo spd coil measures 200 ohms then the most likely cause of failure is bad grounds. Engine must be grounded, CDI box must be grounded.
CDI boxes came off Z's H2 that was literally running the evening before he brought it up here. There is a main ground to the rear engine mount with a 12 gauge wire going up to the frame where the CDI , battery ground and black/yellow main harness grounds share. All lights etc work and use this ground thru the harness. I agree that it must be a ground but I simply cannot see where the bad ground could be.
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Post by mraxl on Mar 17, 2023 14:53:47 GMT -5
CDI boxes came off Z's H2 that was literally running the evening before he brought it up here. There is a main ground to the rear engine mount with a 12 gauge wire going up to the frame where the CDI , battery ground and black/yellow main harness grounds share. All lights etc work and use this ground thru the harness. I agree that it must be a ground but I simply cannot see where the bad ground could be. If it were me... I would connect an ohmmeter to the battery neg. Then using the other probe check via connectors at cdi the resistance of lo spd coil, and each pickup. Also cdi case.... it should be zero ohms. Engine case should also be zero ohms.
By checking at connectors it verifies cable wiring and ground connections. If you had spark at one coil and then lost it it would indicate a poor connection or flakey ground. Maybe you have already done this but it might be worthwhile to check again.
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Post by Walms on Mar 17, 2023 16:37:41 GMT -5
Sorry if I missed it in the read but have you checked the the primary and secondary resistance on the coils yet?
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Post by kawonda750 on Mar 18, 2023 6:43:25 GMT -5
yes Andrew. Coils test fine.
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Post by zambia on Mar 18, 2023 8:30:26 GMT -5
If it were me... I would connect an ohmmeter to the battery neg. Then using the other probe check via connectors at cdi the resistance of lo spd coil, and each pickup. Also cdi case.... it should be zero ohms. Engine case should also be zero ohms.
By checking at connectors it verifies cable wiring and ground connections. If you had spark at one coil and then lost it it would indicate a poor connection or flakey ground. Maybe you have already done this but it might be worthwhile to check again.
This seems like a great and systematic way to find the issue.. for me, it seems likely to be a bad ground - and although the kill switch is brand new, I didn't trust that either LOL. All the low speed coil tests, signal coil and CDI readings were perfect. I couldn't see any reason the grounds were not OK as Dave had run clean new connectors to ground .. but?? My other concern was the LED signals. I know nothing about that setup but diodes can do weird things with low current.
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Post by kawonda750 on Mar 18, 2023 9:00:57 GMT -5
CDI boxes came off Z's H2 that was literally running the evening before he brought it up here. There is a main ground to the rear engine mount with a 12 gauge wire going up to the frame where the CDI , battery ground and black/yellow main harness grounds share. All lights etc work and use this ground thru the harness. I agree that it must be a ground but I simply cannot see where the bad ground could be. If it were me... I would connect an ohmmeter to the battery neg. Then using the other probe check via connectors at cdi the resistance of lo spd coil, and each pickup. Also cdi case.... it should be zero ohms. Engine case should also be zero ohms.
By checking at connectors it verifies cable wiring and ground connections. If you had spark at one coil and then lost it it would indicate a poor connection or flakey ground. Maybe you have already done this but it might be worthwhile to check again.
All readings are 0.00
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Post by kawonda750 on Mar 18, 2023 9:02:44 GMT -5
If it were me... I would connect an ohmmeter to the battery neg. Then using the other probe check via connectors at cdi the resistance of lo spd coil, and each pickup. Also cdi case.... it should be zero ohms. Engine case should also be zero ohms.
By checking at connectors it verifies cable wiring and ground connections. If you had spark at one coil and then lost it it would indicate a poor connection or flakey ground. Maybe you have already done this but it might be worthwhile to check again.
This seems like a great and systematic way to find the issue.. for me, it seems likely to be a bad ground - and although the kill switch is brand new, I didn't trust that either LOL. All the low speed coil tests, signal coil and CDI readings were perfect. I couldn't see any reason the grounds were not OK as Dave had run clean new connectors to ground .. but?? My other concern was the LED signals. I know nothing about that setup but diodes can do weird things with low current. I disconnected the signals and then, for fun, disconnected all lights and horn with no results.
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Post by autofobe on Mar 18, 2023 11:05:43 GMT -5
The 72 h2 had no kill switch but the B did along with a single ignition box.If you have the kill switch harness with the 3 ignition boxes it may not be compatible. Maybe the problem is with the harness.As I said in the beginning,I think I would make a simple ignition only harness . To try If all the ignition parts are good. Brad
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Post by zambia on Mar 18, 2023 12:20:20 GMT -5
The 72 h2 had no kill switch but the B did along with a single ignition box.If you have the kill switch harness with the 3 ignition boxes it may not be compatible. Maybe the problem is with the harness.As I said in the beginning,I think I would make a simple ignition only harness . To try If all the ignition parts are good. Brad All H2 years/models had the same CDI boxes. Dave has a '74 H2B engine in this bike along with the usual 3 CDI + rectifier for ignition boxes. The "dash" is H2B and the kill switch is new. We had spark and then lost spark, so my guess is something funky in the wiring harness and/or a poor ground.
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Post by kawonda750 on Mar 18, 2023 13:07:05 GMT -5
Ok, ashamed to say, but I have spark on 2 cylinders now. I went back to each ground on the frame and the engine and sanded the heck out of each one. I got spark on the 2 I just mentioned. I still have nothing on the centre one. I switched the red from the left cylinder to the centre and got a spark there too. I am guessing that that box is no good.
I had cleaned all those grounds before and they looked good and worked with the test light when used.
Getting there anyway.
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Post by autofobe on Mar 19, 2023 9:38:53 GMT -5
Z,I looked at the h2b wiring diagram from the triples resources which shows a single box so assumed that it was different from the earlier models. That diagram is obviously wrong. My mistake on that one.
Dave. Glad to see you got to the bottom of the problem.It’s good to have friends that all try to chip in and solve the problem. With out that, we would all be tearing our hair out.These old bikes keep us thinking. Brad
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Post by pipe welder on Mar 19, 2023 18:38:43 GMT -5
Almost a year since you started this thread Dave. Time to edit the title. It’s not coming soon anymore. Lol
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Post by mraxl on Mar 20, 2023 6:10:07 GMT -5
Ok, ashamed to say, but I have spark on 2 cylinders now. I went back to each ground on the frame and the engine and sanded the heck out of each one. I got spark on the 2 I just mentioned. I still have nothing on the centre one. I switched the red from the left cylinder to the centre and got a spark there too. I am guessing that that box is no good. I had cleaned all those grounds before and they looked good and worked with the test light when used. Getting there anyway. A test light is a very crude way to test for solid grounds. Glad to hear there is progress!
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