Modern Vespa : 2020 Vespa GTS 300HPE Supertech hard to start.

2020 Vespa GTS 300HPE Supertech hard to start.

desliderman

UTC

details

Member

2020 GTS Supertech 300

Joined: UTC
Posts: 38

desliderman

Member

2020 GTS Supertech 300

Joined: UTC
Posts: 38

UTC quote

Afternoon all!

YR: 2020.
Model: 300 GTS HPE Supertech.
Mileage: 5400miles.

Problem: Hard to start. Once started, kept dying. Once running, smelt flooded. Giving it some throttle (about 2500 rpm) and it would bog down.

Added gas treatment.

After it finally warmed up I took it for a spin. It never missed a lick.

Brought it home, put a tender on it.

The only mod I have done is to install one of those tone / speedrings. However, that was 2000 miles ago.

No CEL but late last year I kept topping off the tank. I was at a rally and I did it enough times to trip the light. It did clear a week later.

Don in KC

hewl35 UTC details Enthusiast 2018 Gts 300 Joined: UTC Posts: 72 Location: Arkansas
hewl35 Enthusiast 2018 Gts 300 Joined: UTC Posts: 72 Location: Arkansas	UTC quote My guess is the emissions vacuum tank needs to be removed.

Dooglas UTC details Veni, Vidi, Posti GTS 300ABS, Buddy 125, Buddy Kick 125 Joined: UTC Posts: 13439 Location: Oregon City, OR
Dooglas Veni, Vidi, Posti GTS 300ABS, Buddy 125, Buddy Kick 125 Joined: UTC Posts: 13439 Location: Oregon City, OR	UTC quote If the problem actually is liquid gasoline in the evap system charcoal cannister, a more straight forward answer might be to stop overfilling the gas tank by repeated topping up.

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