Sorry to make my first post a request for help.
I have a Derbi 50cc 2-stroke scooter that won't start anymore.
It ran fine all summer long and only has 1,500 miles on it. Literally looks new.
It has oil-injection (no pre-mixing) and is water cooled. I think it's pretty well the same motor they put in every modern derbi/piaggio/vespa nowadays.
It's carburated and kick-start only. There's no mods on it other than a tuned header/muffler. I don't know if the previous owner re-jetted it. She said she hadn't.
The last time it ran (about a month ago), it just suddenly stalled. I looked at the tank and it looked pretty well empty, so I just assumed it was out of gas.
So I pushed it home and parked it since I was really close to home.
I forgot I had parked it out of gas, so a week later, I go to start it, and runs for about 5 seconds...stalls again. Then I remembered I had parked it out of gas. I filled it with the jerry can with fresh supreme, and since then I haven't been able to start it.
Here's what happens:
-I turn on the ignition, then turn on the manual choke as per usual. I never give it throttle to start it.
-Kick it over about 10 times vigorously then I get tired and give up.
-Rest a bit and try kicking it over again a bunch of times. No go.
(Usually it would start after about 2-3 kicks.)
-Now it just starts to stink like gas, and sometimes the carb gets soaked with gas and it starts to drip down from it and makes puddle under the bike.
Here's what I've checked:
-Took out the plug and cleaned it/filed it/gapped it to the correct 0.6mm. (Not like it was really dirty or open or anything).
-Confirmed that there's plenty of nice blue spark.
-There's definitely enough gas getting to the cylinder, as the plug is usually soaked with gas after kicking it over so many times.
-In fact, when I was checking for spark with the plug out and I kicked it over, a geyser of gas sprayed out of the spark plug hole!
-The leaking gas around the carb is from the air filter boot on the air intake side of the carb. I guess the carb gets so full of gas that it has nowhere to go but to start heading towards the air filter...and starts seeping out of the bottom of the rubber boot.
-I've tested the fuel tank petcock (which is automatic - no on/off/reserve tap). When there's no vaccum applied to it there's no flow at all. When I apply a bit of vaccum, there's plenty of flow - which is all good.
-battery is great - but topped up the charge just in case.
It just seems to be constantly flooded with gas.
I'm out of ideas...any advice would be appreciated, or if anyone can recommend a good scooter mechanic that's familiar with these european motors?