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Post by crocman on Nov 3, 2023 13:50:33 GMT -5
So I recently built a MZ50 scooter (CPI 2001 minarelli horizontal clone). It ran great did like 60mph easily, I was thrilled. 2 days later I took it to grocery store. Turned it off. Came back and out and no spark.
To date I have:
Tested kill switch and key - both go to ground when they should
All testing below was done with kill wire to CDI unplugged to ensure switch and key was ruled out:
Tried 2 different brand new CDI
Tried 2 different brand coil pack
Replaced pick up coil - reads 0.6VAC at cranking
Stator reads 75VAC at cranking - not replaced but tests fine
Replaced spark plug
Jumped wires from cdi directly to coil pack to ensure no pinched wires in wire harness
Added ground wire from frame to engine
I have basically given up at this point. It has been like 5 weeks. This is really bugging the crap out of me. Any help at all would be greatly appreciated.
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Post by 190mech on Nov 3, 2023 17:24:30 GMT -5
Is the engine grounded to the frame?
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Post by crocman on Nov 3, 2023 19:12:40 GMT -5
Would adding an extra grounding strap between a frame bolt and engine bolt work? I had the plug grounded directly to the battery while I was testing for spark using a jumper wire with alligator clips.
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Post by crocman on Nov 5, 2023 10:22:20 GMT -5
I bolted on an extra ground wire from the engine to the frame instead of just using alligator clips. Still no luck.
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Post by crocman on Nov 12, 2024 9:55:28 GMT -5
Just wanted to follow up on this. The stator ALWAYS tested fine. When finally replaced because did not know what else to do, it fired over first kick. Never really fully understood what was wrong with the stator. Just happy it started.
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Post by snaker on Nov 12, 2024 10:44:17 GMT -5
Curious if you have a AC or DC ignition.
I don't see any mention of it or trouble shooting checks of any AC ignition power coil on the stator
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Post by crocman on Nov 12, 2024 11:06:30 GMT -5
Snaker,
It uses an AC stator and AC cdi as far as I understand. When I was measuring with my DMM set at AC volts, the bad stator would read 75VAC across the ignition signal wire coming off the stator to ground (when cranking).
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Post by snaker on Nov 12, 2024 23:40:37 GMT -5
An AC style stator has two different sets of coils
The lighting coil is a set of multiple posts with usually bare looking coil windings.
75 vac output from the lighting coil at higher rpm's would be expected when not being plugged into the wire harness.
The AC ignition power coil, usually one or two posts, and usually wrapped differently than the rest, would typically output 20vac with a lot of variation.
If that coil is dead or off, you have no AC ignition power
The lighting coil and the AC ignition power coil are two different coils that share the same plate mount and maybe some common wiring.
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Post by crocman on Nov 13, 2024 10:14:56 GMT -5
I must of done something wrong? I followed the 49cc scoot youtube on checking for spark video and pretty sure I followed it to a T. But maybe not? Anyway. I was aware of the two separate circuits. Shortly after getting it running I converted it a full sine wave stator and running the trailtech rectifier for about a year now.
Luckily the replacement has never given any issues, and arrived from ruckhouse with oem quality heat wrapping around the wires and such.
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