Motor kit stopped running all of a sudden.

Hello,

So I'm new here, and am already posing problems...
I have been running the Daemonbikes "80cc" 2 stroke for a couple months,
and its been running perfectly.

I was riding today, immediately following a carb cleanout, only about 2 miles for a test run.
and as I pull up to the apartment, all of a sudden, the motor stops running.

Right now I have no explanation.

Here are the symptoms:

Upon attempt to start:
Engine turns over and goes putputputputput....
but you can feel its only being dragged along by my fat butt.

Upon evaluation:

Spark - Visible in the day time

Compression - Just under 150psi (149 abouts...)

Fuel delivery - All lines open, Carb sprays fuel/oil mist out the throat when the engine is turning over.
Carb- All seals tight, fuel ports open and clear.

Piston- also stays wet with fuel.

> removed head to inspect, piston clean, cylinder walls clean, no scoring.

Right now I'm running 16-1 fuel mix. It had been running great up until this point.

(Mods- Opened up intake ports a little, exhaust port a little. Got top speed up to 35.)

I'm thinking of replacing the stock slide carb with a "Racing" carb. Mostly in hopes that it isn't so...
crude....


Anyone know what the deal is? I'm stumped.

I've tried two, one just began returning no spark at all.... so I think its the CDI that quit on me.

First plug was stock, it lights up, but only at fairly high rpm.
Second was a bosch platinum 2pt plug that used to light up no problem.
doesn't light at all any more.
Does that sound like the CDI or the mags? (or, mag...)

All righty. I'll go on a gas run as soon as I have a moment to myself.
For now i'll be driving. Diesels are so much easier to care for.

Update: New CDI came in friday, and I also got new gas, at 32-1, as recommended. First I tried out just the new gas, and got a couple putts... then nothing. Then the new CDI went on and wham! first rotation startup. I also down/upgraded to a 34T cog, giving me a cruising speed of 28-30mph, top speed of 35.5 on the flats. I don't mind pumping the pedals a couple times to get going from a stop.
Good to be riding again.

on another note, I'm about to do a search, but who's done little carburetor scoops for these things?

We'll see i suppose, its less looking for ram air, than flipping the cleaner over to get it out of that hot oily eddy that builds up behind the engine when its moving, than adding a rain hut. Any extra pressure, however small, can't hurt too bad, right?

Dang chang, thats a pretty one. I love that classic frame too. Mine's an ugly duckling, on a spray painted schwinn skyliner. (but hey, she moves.) If I had a camera that was worth a dang I'd post pictures.
Here's a crappy photo:



Here's the first iteration, with a front wheel far too nice to leave one it. When I ride my regular road or mountain bikes i am surprised at how much effort it takes...