I have a Sachs Prima G3 from 1979 (It was sold to me as a ‘79, but the manufacture date on the bike is December of ‘79, so prob a year model ‘80, perhaps?)
I tinkered with it. The wiring needed to be fixed. I re-wired it but couldn’t get a spark. I took it to a friend of mine who wires up airplanes for a living, printed up the schematics, and he wired it up real pretty. Got spark. Got compression.
Put it back together and crank, crank, crank, crank, vroom! Short vroom, like about a second or so. Poof of exhaust. Then sputter down.
Started leaking gas from the Bing carb. Had to replace a sinking float. Put it back together. The new float floats. Gas is getting to the chamber. All seems well.
Crank, crank, crank, crank, crank, crank, crank, vroom— But an even shorter vroom. Like 1/2 second. Some exhaust.
More cranking. Lots and lots more cranking. One final vroom for about 1/4th a second. Then, buttloads more cranking yet, no more vrooms. I pull the plug and grounded it out, crank the pedals in search of a spark (same test I initially did where I did see a spark). No spark.
I figure next to bypass the kill switch and see what happens. Maybe put a volt meter on the coil where the spark plug wire connects, crank it and see what’s cooking there, if anything. Not sure what the measurements should be... Re-test the spark plug cable.
What do y’all recommend I do to troubleshoot and fix the prob?
So close to riding this sweet bike! Thanks in advance,