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Hey again,
Like Scott/3Phase said, the ignition system is finicky, and IF the battery is a bit weak, as well as the circuit corroded, you can drop voltage easily so that the IGN doesn't get enough when cranking....and so you don't get any spark. I had a battery that I didn't realize had gotten too weak, would crank but would not start. I used a jumper battery, but instead of putting it on the main battery, I used it to just POWER the IGN circuit separately from the starter circuit. Then when I tried to start the bike, it actually started and ran. That confirmed that my battery was too weak and need of a good charging to get it up to full power. After that, it DID start the bike without the booster battery.
I didn't reread this thread. We know that the 81 series are less prone to the pickup coil wire breakage problem, but you can't rule it out. There are also tests to ensure that the PU coils are within spec.
Another thing that can happen is that the solder connections WITHIN the TCI can go bad. I think there's a tech tip about how to freshen up the solder connections ON the PCB where the external connectors/pins join to it....resweating them can sometimes solve a problem.
T.C.
Like Scott/3Phase said, the ignition system is finicky, and IF the battery is a bit weak, as well as the circuit corroded, you can drop voltage easily so that the IGN doesn't get enough when cranking....and so you don't get any spark. I had a battery that I didn't realize had gotten too weak, would crank but would not start. I used a jumper battery, but instead of putting it on the main battery, I used it to just POWER the IGN circuit separately from the starter circuit. Then when I tried to start the bike, it actually started and ran. That confirmed that my battery was too weak and need of a good charging to get it up to full power. After that, it DID start the bike without the booster battery.
I didn't reread this thread. We know that the 81 series are less prone to the pickup coil wire breakage problem, but you can't rule it out. There are also tests to ensure that the PU coils are within spec.
Another thing that can happen is that the solder connections WITHIN the TCI can go bad. I think there's a tech tip about how to freshen up the solder connections ON the PCB where the external connectors/pins join to it....resweating them can sometimes solve a problem.
T.C.
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