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Yes, after I posted I did a Google search and found the solenoid is the likely suspect. I took off the inner cowling to get to the solenoid and I might have tapped it enough to get it working again. I thought I'd attempt to disassemble it to see if anything is binding, and of course I broke one of the wires on the coil. Cheap enough to just put a new solenoid in. To hold me over while I wait for the delivery I made a temporary solenoid, using a relay I had on hand for an electric bike.

It works fine.  Now I just have to get Delfran to honor their lithium battery warranty.

Funny story, way back in the late 60's I bought a 1964 Honda Dream (305cc 2-cylinder).  Because it ran so poorly the seller let it go super cheap.  I took one look at the exhaust and had a feeling the owner never had it running on two cylinders.  One pipe was heat tarnished and the other looked like new.  I put new plugs and the thing ran like new.  I wound up selling it and bought a 4 cylinder 750 (first year out) and the person who bought the Dream took it to the Woodstock festival and got good service out of it.

As far as the gas tank vent clogging, it looks like that was the cause of all my problems.  I did get the new lithium battery and was shocked at it's small size.  It must weigh 1/4 of the gel cell weight, and half the size.  IMO well worth the extra money.

I thought I had it figured out, when I remembered I had the same situation on my last scooter, a Jonway 250.  It turned out to be a bad spark plug on that bike.  I had taken the stock plug out when I bought it, and replaced it with an expensive Bosch Platinum+ plug.  The Bosch went bad in no time.  Put an NGK in and all was well.  This bike had an NGK already, but I replaced it today with a new plug.  I took it for a long ride and thought it was fine.  When I was almost home, it did the same thing.  This time I loosened the gas cap, and it started right up.  I'll take it for a long ride again tomorrow with the loosened cap and see if it craps out again.

What is the recommended fix if it is the cap?  Drill a vent hole, or replace with a new cap?

It happened for the first time last week.  I was on a local highway.  Hopped on one exit and got off at the next, traveling about 50 - 55mph, trying to keep up with traffic.  As I exited the engine died.  Pulled over to the side of the road and after some coaxing it restarted.  I attributed it to pushing the scooter a little too hard on the highway, and thought hopefully it wouldn't happen again.

Tonight, while traveling on a local road, at about 40 mph, it happened again.  This time it wouldn't restart, and I seemed to quickly drain the battery down to where it wouldn't even turn over.  Luckily, I have one of those little lithium booster packs stored under the seat.  After hooking it up, it quickly started and ran ok.  

I was half way home when it did the same thing, while traveling about a constant 45 mph.  Once again, I killed the battery very quickly while trying to start it, and used the booster pack again.  It started and I took it easy going home, and it was again ok.

Question:  could this be a battery going bad?  This is not the original battery and is supposed to be a better battery than what it came with.  I have a digital voltmeter on my bike, so I always know what the voltage is, and it appears to fluctuate between 12 and 14 volts, depending on the speed.  Could the rectifier, after heating up, give intermittent voltage and sometimes not enough to run the engine?  It's been warm around here, but I've ridden in weather this warm in the past with no problems.  Any ideas?

I would start by just putting in a new spark plug. I had a similar problem on my last scooter, a YY250T. Drove me crazy, since it was intermittent, and it was a top of the line plug. Wound up replacing a rectifier and some other goodies, before realizing it was the plug.

Thanks for all the help guys. Call me lazy, but I'll probably just disconnect the two front parking lights the next time I have the front shell off, and call it a day.

Jerry, yes the scoot does get some compliments. When down in Key West this past winter I had a few people asking about it. They are used to seeing the 10" wheel scoots, especially since there are tons of 50cc scooters on the streets down there. With the saddlebags, it looks like a hybrid scooter/motorcycle.

Good question.  I never thought to check the voltage at the battery.  I installed a digital voltmeter on a flat spot above the storage glovebox, and took that feed from any wire I could find that had 12v when the key was turned on.  I don't know how much this will vary from voltage at the battery, but I'll check on that tomorrow.

When both headlights are on the voltage goes down to around 11 - 11.5 volts, when idling.  When cruising, I believe it goes up to maybe a little over 12v.  Normally, with one light on it's up near 13v, or maybe  higher.