Scooter troubles. Starts up and then dies. By firepipes (Read 528 times)

[firepipes]

I bought this scooter new online and changed the oils myself. I rode it a lot. Sometimes it would take a lot of effort to start up. It would take like a minute of trying to get it to start for it to run. One morning, it was especially hard to start. After I got it to start, I let it warm up for a couple of minutes. When I went to get on the bike, it cut off suddenly. After that, I couldn't get it to start whatsoever. However, when I let it sit for a while, it will start up, get up to 1500 Rpms for a couple of seconds, drop down to 500, and then turn off. Also, when I attempt to rev it while it's on, it immediately cuts off. It's a 150 cc tao tao scooter and has about 150 miles on the odometer.

[cyborg]

Sounds like fuel delivery problem,,,,check the fuel tap ,,, and I would remove the carb to see if there's debris in the bowl and or jets

[jct842]

While you have the plastic off in a pile do check the Valves, that will save you a tear down in the very near future. There are instructions here in the library and also some good videos of both.

[cyborg]

Another quick check,,,get it up and running till it dies then crack open the gas tank cap,,,if you hear air rush in you have a tank venting issue,,,drill a VERY SMALL HOLE in the cap and that problem will be put to bed

[firepipes]

Will do. I haven't gotten to mess with it yet due to weather, but I'll keep let you know what I find. Also, one thing I forgot to mention is that after it dies, if I attempt to kickstart it a couple of times and then electric start it, it will actually start up sort of as if I let it sit a little. It also seems like the longer I let it sit, the better it starts up and the longer it stays on before it dies.

[cyborg]

I'll bet $20 it's a tank venting issue

[jasonwilson]

This could eithre be a fuel tank venting issue, or an air leak somewhere on the intake. Check the intake hoses and intake manifold as well for any cracks or splits. Also, if it IS a fuel tank vent issue as I had with mine, check this little valve here to see if it is stuck closed. If you can blow through it (it has an arrow to determine air direction to the tank) then it is fine, if not then replace.