Modern Vespa

Hello,
My Vespa (gtv 250) started having an idle problem today.

When slowing down and when stopped at the light, the idle speed is irregular.
Basically goes up few revs/down few revs. Enough to move the scooter a little bit if I am stopped downhill.
It does not stall, just goes up and down a little bit.

Does anybody know what it is?
Also would the warranty cover the eventual labour?

Thanks!

This occurs for me, usually after a few weeks of not riding. I switch back between scooters, and several times this summer, I would go for sometimes three weeks or more not riding my GTS.

For me, the ECU eventually catches up with the current, air temp, humidity, whatever the O2 sensor is picking up and adjusting the mix accordingly. Usually after a few starts, it smooths out for me.

Possible causes:
*Battery is low
*ECU needs re-setting. Disconnect the battery for about 10-15 minutes and then see if that cures the problem.
*If you still have the EVAP canister system and you have over-filled the tank, this can cause erratic running problems.

How many miles on your scoot? Most likely just time for a tuneup/valve adjust.

Other thought: fuel blends change in some states in the Summer months...if NY is one that does...ethanol blends, might make it wacky, but it's a real stretch.

Sometimes applying the rear brake gives that impression; (locking the rear wheel causes more engine vibration transmitted to the rider). See if alternating the front/ rear brakes gives you the effect.


Regards
Harvey

It happened to me once on the way to work. I decided I'd figure out what happened when I got home.

That afternoon the problem was gone. Hasn't reoccurred in over 3,000 miles, so I've chalked it up to "Just one of those things".

There have been other reports of the phenomenon--once, then never again.

I wouldn't worry if it doesn't happen again.

P.

It happens to me from time to time. Don't know what causes it, but turning the key off and restarting clears it up.