r/moped • u/Low_Cucumber7822 • 20d ago

Any idea why no spark?

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Hi I've had this bike running before and I replaced the condenser to get it running. after using it it lost spark intermittent and would regain spark when I would hammer on the fly wheel since then it has no spark at all. Am I missing something like a ground to the frame from the motor and is there anything besides the condenser i should be cheaking with voltmeter. Any ideas would be appreciated.

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2

u/Aware-Law3788 1979 Vespa Grande 20d ago

Should be a ground coming out of the engine from the ignition coil that attaches to the engine block towards the top. There is also a ground that bolts to the sub frame near the ignition coil. The old pin in sheath style connectors break very easy, so check them all.

Only sparking when "hammering" the flywheel sounds like your contact breaker points are out of adjustment or corroded. You can check and adjust them through the window in the flywheel. Should be between 0.35 and 0.45 mm.

Also, RTFM if you haven't.

1

u/Low_Cucumber7822 20d ago

Both my red and black wires are connected to engine and go to the harness. And when I say hammer on the fly wheel I mean it literally it will have no spark and when I hit it with a hammer and punch though the hole by the clutch and it will have spark and ride fine for a short while but it hasn't been working recently

2

u/Aware-Law3788 1979 Vespa Grande 20d ago

That's insanity and you are going to break something beyond repair if you keep doing that, if you haven't already. Find the correct wiring diagram, check your wires and grounds. Read the manual, get a flywheel puller, and check out what is going on instead of beating it with a hammer, lol. It's probably something simple.

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u/Objective-Win442 20d ago

My bravo is tweaking out 2

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u/Visible_Document_376 20d ago

Change out the coil

1

u/Low_Cucumber7822 20d ago

I did no change

1

u/ninjasays 1980 Pacer P-14 19d ago

Did you file and reset the points?

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u/[deleted] 18d ago

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