How can I get my scooter to start consistently?

by Jeff
(Durham NC)

I have a 2005 Avanti 150cc scooter. Sometimes it starts, sometimes it doesn't. It's very unpredictable. When it starts, it starts right up and runs perfectly. But when it won't start, it's as if the kill switch is on; it cranks and cranks, but never even sputters.


Twice now I have started it in the morning and ridden it to work without any problem, and then when I go to start it to ride it home at the end of the day, it cranks but won't start (so I've had to get a ride home).

One of those times I went back to get the scooter with a trailer, and it started right up. The other time it wouldn't start, but the next day (after it was in my garage), it did start.

Because it's so hard to predict, I've just been leaving it in my garage and trying to start it once a day to see what happens. Some days it starts, some days it won't (and I'm doing the exact same procedure to start it).

It has an alarm system, and I wonder if maybe the alarm is overriding the start mechanism and keeping it from starting. I've been leaving the alarm off, but even then, it still starts sometimes and not other times. When it won't start, the starter cranks the engine just fine, but the engine won't kick in or even sputter.

Again, it's like the kill switch is on (but it's not). One more detail, in case it helps. The scooter has a remote start (a button on the key fob). Just like when you use the key, sometimes it remotely starts right up, and other times it just cranks but doesn't start. It seems like an electrical issue since it runs great when it does start. Like maybe a loose connection somewhere.

But I've used the remote to start it (without ever even touching/moving the scooter) and sometimes it starts and other times it won't, making me think a loose wire might not be the culprit since the scooter wasn't moved at all between start attempts.

Any suggestions?

Comments for How can I get my scooter to start consistently?

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May 28, 2014
same here NEW
by: Anonymous

I have exactly the very same problem. I done everything what i could. Cleaned the carb set it up according to the manual. Valve clearance changed the airfilter, changed the spark plug, checked the ignition, checked the cdi. Nothing helped. it has spark and the when I check the spark plug it has fuel on it. Plenty. I think the problem either with the carb or with some wire. But if you know something please help us. I am loosing my hope

Jul 18, 2012
Same problem NEW
by: Litterbaux

I'm having the exact same problem. The carb is clean, the plug is new, the coil is new and the battery is new. The starter is working fine, it just won't fire up.

It's completely random if it starts or not. Like the original poster said, I highly doubt its an electrical connection due to the fact the bike is sitting in my garage untouched. One day it starts, next day it doesn't. It makes no sense.

Any other idea's would be great! If I had hair to pull out I'd be pulling my hair out at this point!

Thanks!

Feb 13, 2012
Carb and Connections
by: Jim Zeiser

The first thing I would do is put a few ounces of Seafoam in the gas tank in case of crud in the fuel system. Then I would disconnect and reconnect all the wires in the ignition circuit. Another thing to try is using the kickstarter. Sometimes a battery has enough amps to spin the starter but not fire the ignition. I had a scooter do that. It fired on the kick starter every time but would spin and spin without starting with the electric starter. I knew the battery was bad so it didn't surprise me.

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