Hi, I have an older (99 reg) water cooled 2 stroke Aprillia Area 51 50cc scooter that I am working on.
I got it two years ago for pocket money, as the main bearings were going.
I had the engine rebuilt just before last winter, including a complete new bottom & top end & a carb clean out /rebuild.
I didn't run it at all after the rebuild (apart from once up the road to check it worked fine), I just stored the scooter under cover until about a month ago.
It would not start at all, so suspecting stale fuel, etc, I:
- Drained & flushed the tank & fuel lines
- Replaced the air filter
- Replaced the fuel filter
- Replaced the battery
- Replaced the spark plug
- Pulled the carb & cleaned it out
- Replaced some split / leaking fuel lines that came to light refitting the carb.
It then started & ran fine, but now it is colder & needs the manual choke to start, I have a problem where the scooter starts first time on button or kick & ticks over fine... however, while the manual choke is on, even slightly, the engine dies if you attempt to ride it away. This is a right pain, as it means running the scooter on full choke for 20 minutes before riding away (if left to idle) or 10 minutes of loud revving every time I want to use it, making me popular with the neighbors!
As soon as you can put the choke fully off, it pulls away & rides just fine.
The other symptom is that when you stop the engine, petrol runs out of the drain tube at the bottom of the carb for a short while .... about the amount you would imagine is in the carb when fuel pump has stopped running.
I suspect a carb fault, but would welcome any ideas from the more experienced as to what to look for.
Thanks in advance,