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I have this scooter given to me that doesn't start after it sat for a while. An early discovery was the starter clutch slipping and not engaging. I can get it to engage sometimes. Here are the symptoms and what has been done to troubleshoot:

Does not start, kicks back and will pop out through exhaust. This seems like preignition.

The ignition system works and has spark

Tried a new module and coil

Checked cam/crank timing

Checked to ensure the piston was indeed at TDC when at TDC (T) mark on the flywheel

Checked stator and trigger using ohm meter

With meter in AC mode and with engine cranking (when I can get starter clutch to not slip) I have .5V at pickup and 70V at power supply from stator (that 70V seemed high)

With the spark plug out engine kicks fine. With spark plug in engine kicks fine. With plug in and spark plug wire connected engine kicks back.

With plug out I checked ignition timing with a light and it is pretty advanced. There is a T mark and F mark and two marks up from that. The ignition is firing at around those two higher marks. I might have suspected a sheared key but I checked that by ensuring the piston was at top and TDC lined up on the flywheel.

I did disconnect an aftermarket looking alarm system that I thought might have some odd effect on the ignition system.

I do have a starter clutch coming but I know it is not going to fix the no start.

Anyone have any thoughts on this? I am kind of scratching my head at this point.

So it wasn't the 835, so I found one that is 818 x 19 x 28. It seems not loose but I haven't checked the travel up the variator yet.

I did open up the 818 still too short. The 835 is back in. Now that I understand there carb tuning I think that was making everything off.

So air fuel mixture mostly does all generally, idle screw, idle only, the needle is for after take off to mid range and jet is mid range to WOT. That wasn't obvious to me. It is now. I'm set for the cold weather. When it warms up I'll slowly move the needle clip back down to lean it out as the temperature warms and the air gets thinner. I'll re-jet as it gets warmer too because of the same reasoning, air thinning as at Warner temperatures. I'll also need to adjust air fuel mixture too.

I wonder if someone has figured out at what temperatures the adjustments are needed?

So, for 100° and above, 90 to 80 and do on down to negative 30° Fahrenheit.



Do one change and check results.

This is what should be done,, one change st a time,,, sounds like you got it covered pretty good now

Ok cool it was the Choke I knew It was something in the Choke or Float level.
Keep plugging away.