Vespa GTS carb removal
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Joined: 02 Sep 2019
Posts: 3

Mon Sep 02, 2019 12:38 pm quote
Does anyone know how to remove a carburretor on the vespa GTS 300 and thinks they can walk me through it on here?
BV350, Primavera 150, Yamaha Zuma 125
Joined: 06 Jun 2013
Posts: 3114
Location: The Twin Cities of Minneapolis/Saint Paul, Minnesota
Mon Sep 02, 2019 1:11 pm quote
There's no carburetor to remove. It's fuel injected.
Joined: 02 Sep 2019
Posts: 3

Mon Sep 02, 2019 1:23 pm quote
Thats embarrassing, the reason I wanted to know is because my vespa has been running at sub-optimal power, and over heats often as a result, I took it to the mechanic and he ran the diagnostic on the fuel injector, and said it was ok, and was running at optimal condition again, now it has gone back to sub-optimal, and wont pass the 40km mark on a straight road, I was planning to take the carb and injectors out, how would I remove the injector, and would you reccommend doing so? p.s: I have a fuel injector cleaner kit, thanks for the help
MV Santa
GTS250, 1960 VBA, 1975 VBC, 1980 P200E cutdown
Joined: 04 May 2010
Posts: 4335
Location: Sedgwick, Kansas
Mon Sep 02, 2019 3:06 pm quote
I don't think taking out the injector will give you any information.

When you say it won't go past the 40km mark do you mean that it won't go faster than 40kph? That is a problem.

You say it is overheating. Does the gauge read hot or do you have some other indication of overheating? Have you checked your coolant level?

Does the transmission seem to work OK? Do the brakes feel like they are draging?
2006 GT200L "Lone Star"-Sold, 2006 Yamaha Majesty YP400
Joined: 15 Jan 2019
Posts: 636
Location: Texas
Mon Sep 02, 2019 6:53 pm quote
Be methodical. Air cleaner dirty? Old fuel? Belt slipping? Bad spark plug? Bad plug wire? Exhaust leak? Brakes dragging? Bad head gasket?

Is it revving like crazy and still speed limited? How does it idle?

Overheating and lack of power could be a lean fuel mixture, could be an ignition problem.

Don't assume it's a bad injector until you eliminate the simple things.
GTS 300 Super
Joined: 13 Sep 2017
Posts: 998
Location: West Sacramento, CA
Tue Sep 03, 2019 8:19 am quote
Suprised there's not something up on WIKI???
Joined: 02 Sep 2019
Posts: 3

Tue Sep 03, 2019 11:55 am quote
It was left standing for 8 months before being passed down to me, so it did have old fuel, oil and coolant, I know it overheats because the fans start to sound like crazy, Ill send a video of it idling and what it does/sounds like when I hold the throttle open at a constant point.
2010 ThunderFly 190, 2008 250 GTS
Joined: 29 Apr 2011
Posts: 2718
Location: Springboro, OH
Tue Sep 03, 2019 12:39 pm quote
Get rid of the old fuel and add fresh gas. The crappy fuel may not be burning nicely, messing with the O2 sensor and causing issues.

Check your Spark plug isn't fouled and clean the air filter as well.
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38635
Location: Pleasant Hill, CA
Tue Sep 03, 2019 6:02 pm quote
My bet is that gummy deposits from the old gas in the system keeps clogging the injector. This leads to the lean condition - lack of power and overheating.

Clean the whole fuel system well, including the throttle body and injector.
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