OP
UTC

Hooked
Vespa T5 - GTS250 - HEAT
Joined: UTC
Posts: 495
Location: Britain
 
Hooked
Vespa T5 - GTS250 - HEAT
Joined: UTC
Posts: 495
Location: Britain
UTC quote
Toying with the idea of upgrading the carb on my T5. It is a Malossi 172, 21 tooth clutch breathing through a Taffspeed exhaust.

Its running standard auto-lube carb at the moment. I dont want to go to a really large Dellorto 28mm car etc. Hear good things about Hotrod Scooters Vortex carb. Anyone any thoughts and a link to the guy who makes them?
@jackson85 avatar
UTC

Ossessionato
T5 Pole Position, T for thoroughbred
Joined: UTC
Posts: 4631
Location: Dublin
 
Ossessionato
@jackson85 avatar
T5 Pole Position, T for thoroughbred
Joined: UTC
Posts: 4631
Location: Dublin
UTC quote
guys on here swear by the al fella. as far as I know though, the vortex card does 3% mix at all revs. open to correction of course
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
Posts: 2098
Location: Racing Capital of the World
 
Ossessionato
@gickspeed avatar
Joined: UTC
Posts: 2098
Location: Racing Capital of the World
UTC quote
jackson85 wrote:
guys on here swear by the al fella. as far as I know though, the vortex card does 3% mix at all revs. open to correction of course
Vortex carb has nothing to do with mixture.

Mixture is decided on the oil injection system mounted in the carb box or the the amount of oil added to the gas if premixing.

For Vespa rotary valve engines, premix at 2% and jet your engine correctly.

Running anything more is not sound and you may be leaning your jetting by adding extra oil.

Off topic, but I see it often on this board.
UTC

Hooked
cosa, rally, T5, italjet F125, Lambretta, plus junk
Joined: UTC
Posts: 306
Location: oxford
 
Hooked
cosa, rally, T5, italjet F125, Lambretta, plus junk
Joined: UTC
Posts: 306
Location: oxford
UTC quote
what does " not sound" mean??

and if you jet your bike using 3% theres no problem, is there ?
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
Posts: 2098
Location: Racing Capital of the World
 
Ossessionato
@gickspeed avatar
Joined: UTC
Posts: 2098
Location: Racing Capital of the World
UTC quote
gnasher wrote:
what does " not sound" mean??

and if you jet your bike using 3% theres no problem, is there ?
You can use 10%, I don't really care. Beyond 2%, it's money down the drain.

Just know this, think of jetting independent of your mixture rate.

I know I don't carry much weight on this fair forum, but I professionally port racing topends. They are often radical and at times, beyond what most people run. I use 2% mixture. My customers use 2% mixture. Adjust your rich/lean jetting by changing your main jet. Even when things can get radical, jetting is always the same process via changing the main jet.
UTC

Hooked
cosa, rally, T5, italjet F125, Lambretta, plus junk
Joined: UTC
Posts: 306
Location: oxford
 
Hooked
cosa, rally, T5, italjet F125, Lambretta, plus junk
Joined: UTC
Posts: 306
Location: oxford
UTC quote
why would kit manufacturers recommend 3%?
@gickspeed avatar
UTC

Ossessionato
Joined: UTC
Posts: 2098
Location: Racing Capital of the World
 
Ossessionato
@gickspeed avatar
Joined: UTC
Posts: 2098
Location: Racing Capital of the World
UTC quote
gnasher wrote:
why would kit manufacturers recommend 3%?
Why would manufactures sell topends with 3.5mm of squish? Malossi not even being close.

While it doesn't hurt you per se, it doesn't help. If I was a betting man, some of that may be suggesting covering the magnitude is sin that some tuners/riders will create.

Like I said before, think of jetting independent of mixture rate.
@hojo1690 avatar
UTC

Addicted
1980 P200e, 1956 ACMA, 1979 P200e, 1974 Ciao
Joined: UTC
Posts: 766
Location: Ithaca, NY
 
Addicted
@hojo1690 avatar
1980 P200e, 1956 ACMA, 1979 P200e, 1974 Ciao
Joined: UTC
Posts: 766
Location: Ithaca, NY
UTC quote
I got a Vortex carb just recently from Al at HotRod. (http://http://hotrodscooters.com/). It definitely draws a ton more air than my stock 24/24si. The stock carb could not pull enough air to feed my 226 Vintage Hot Wing. When I got about about 6000 RPM, it would bog out. With the Vortex, I'm having no such problems. The powerband is between 6,000-8,000 RPM, and I've run it to 10,000 without sensing airflow issues.

As pointed out above, the oil injection is part of the lower airbox, which the Vortex does not replace. Al provides a carburetor and airbox lid, while using the airbox you already have.

Hojo
UTC

nothing at all
Joined: UTC
Posts: 9656
Location: westla
 
nothing at all
Joined: UTC
Posts: 9656
Location: westla
UTC quote
Just to add to Gick and Hojo...........Your t5 should have come with a 24g which has a larger air filter than the 24e.

I don't know, check and see what 24 you have, you never mentioned it in your op.
OP
UTC

Hooked
Vespa T5 - GTS250 - HEAT
Joined: UTC
Posts: 495
Location: Britain
 
Hooked
Vespa T5 - GTS250 - HEAT
Joined: UTC
Posts: 495
Location: Britain
UTC quote
T5 carb
Its a standard T5 Dellorto 24G using a 25 main jet. Oh and by the way, the http://http://hotrodscooters.com link wont work
@rgconner avatar
UTC

Ossessionato
GTS250
Joined: UTC
Posts: 2959
 
Ossessionato
@rgconner avatar
GTS250
Joined: UTC
Posts: 2959
UTC quote
Re: T5 carb
sawyer280769 wrote:
Its a standard T5 Dellorto 24G using a 25 main jet. Oh and by the way, the http://http://hotrodscooters.com link wont work
http://hotrodscooters.com

I should have my P200 engine back and it will have a vortex with the expanded airbox.

Starting jet size is going to be 179ish. That means it is drawing double the air and double the fuel over the 118 stock.

(Hole size is 50% bigger diameter, so about double the flow)
DoubleGood Design banner

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com


All Content Copyright 2005-2024 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0144s ][ Queries: 3 (0.0054s) ][ live ][ 313 ][ ThingOne ]