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Well, I finally got some time to work with the scoot, I've been busy with lots of other chores.

Finally tracked it down - bad connection in the side stand safety switch connector, I had previously checked the switch and it was fine, so plugged it back in not giving any thought to the connector since it was clean and the pins on the switch portion of the connector were clean, but I pulled it back apart and inspected the pins on the harness connector - they were slightly corroded. Exercising the connector w/ some contact cleaner in it appears to have cleared the issue, so I applied a small bit of CRC Silicone Contact grease to ensure the weather doesn't regenerate the problem.

So, this was an interesting problem, because the switch although it interrupts the supply to the ignition, there is apparently sufficient back feed through the other sensor circuits to energize the ignition enough that it would fire a few pulses and then quit, which was quite misleading in troubleshooting.

Thanks to all for the suggestions, as it ultimately was one of the suggestions that was the culprit.

Truth be told I don't own a torque wrench. I trust my experience much more than I trust a hunk of steel.

If you are not as experienced as zombie, or don't trust your wrist then Harbor Freight sells a decent 1/4" torque wrench (I wouldn't use it if I were a professional wrencher, but for the scooterist it's quite adequate and cost effective). Just never torque to spec the first time, sneak up on it - I do 50%, 75%, THEN a line width below spec (I like a little safety factor).

You'd be surprised how many spark plugs I've changed that were over torqued, I've watched mechanics install them w/ a 1/2" drive ratchet with a good grunt, I know they were over by quite a bit. One of the reasons I've chosen to do most of my own wrenching, if it gets screwed up it's gonna be my fault doing the work, not my fault choosing a lousy 'mechanic' or shop.

Keep us posted.

Update - I didn't have a lot of time tonight, but I put a dwell meter on the coil primary, and when it would fire dwell was in range for a single lunger, but when it didn't fire (most of the time) there was no dwell, meaning there was no signal or pulse coming from the CDI.

Next test: I will put a meter on the output of the pulser coil and see if it is exciting the ignition, that should narrow it down.

What is puzzling is it ran great when I last rode it 18 months ago, CDI units and trigger coils usually don't just quit when not in use, there has to be a better root cause than just a bad part??

And, for the query on the side stand switch, they usually are good or bad, they usually don't come and go when sitting still - but I wont rule it out until confirmed, as it is in the circuit. Thanks.

'07 People S250 - won't start, will sputter a short burst after repeatedly twisting the throttle (accelerator pump) but won't stay running. Fuel Pump is delivering fuel and if try to start repeatedly, exhaust is warm meaning it is firing but not staying running.

I'm not quite sure what to check, carb has been replaced (suspected of jets plugged), fresh fuel in tank, battery new & charged.

Any suggestions appreciated, did not find similar problem when doing a search, if there is post a link for my review. Thanks