OP
UTC

Hooked
2007 Vespa 250 GTS
Joined: UTC
Posts: 420
Location: Nashville, Tn
 
Hooked
2007 Vespa 250 GTS
Joined: UTC
Posts: 420
Location: Nashville, Tn
UTC quote
07 GTS 250 with 44k miles, runs great but sometimes I get 4 bars opposed to 3 bars normally on the RPM screen. The scoot is trying to move forward. This only happens after 10 miles or more, when cold, the idle is normal.
@phaskins avatar
UTC

Addicted
2006 250ie
Joined: UTC
Posts: 580
Location: Bellingham, WA
 
Addicted
@phaskins avatar
2006 250ie
Joined: UTC
Posts: 580
Location: Bellingham, WA
UTC quote
FWIW, I have the same issue sometimes when the engine is cold and the weather cooler. I've found that giving the engine a little rev will sometimes make it return to normal rpm's. More often just killing and restarting the engine will do the trick. And the golden cure-all has been to ride it to temp, shut down, restart and then it's been good to go.
@juan_orhea avatar
UTC

Molto Verboso
S150 '09, Beo 500ie '08
Joined: UTC
Posts: 1177
Location: Bermuda
 
Molto Verboso
@juan_orhea avatar
S150 '09, Beo 500ie '08
Joined: UTC
Posts: 1177
Location: Bermuda
UTC quote
You MIGHT have a failing, fouled, or disconnected air temperature sensor on the throttle body, which isn't detecting the cooler air, so it's letting too much dense air in, creating a slightly lean mixture, which can cause idle speed to be too high. If you're looking for a little project, get to the throttle body and spray some throttle body cleaner around and see if that helps. Can't hurt.
@olde_rider avatar
UTC

Hooked
Primavera 150
Joined: UTC
Posts: 145
Location: North Central Connecticut
 
Hooked
@olde_rider avatar
Primavera 150
Joined: UTC
Posts: 145
Location: North Central Connecticut
UTC quote
It does sound like a sticky throttle plate to me. I had a carbed tractor that did the same thing.
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