Modern Vespa : 20/20 or 24/24 2t

20/20 or 24/24 2t

OP grahamlml UTC details Addicted Vespa GTS 250 , Baotian 70cc rat scooter, Yamaha V50M 1979 Joined: UTC Posts: 570 Location: Wales
OP grahamlml Addicted Vespa GTS 250 , Baotian 70cc rat scooter, Yamaha V50M 1979 Joined: UTC Posts: 570 Location: Wales	UTC quote I hear there is now a school of thought that the 20/20 carb is better on a 177 kit instead of the 24/24 carb. I not found any comments about the whys and wherefore's of this yet. Can anyone enlighten me please.

roland87 UTC details Molto Verboso '13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S Joined: UTC Posts: 1393 Location: Ukraine. Kyiv.
roland87 Molto Verboso '13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S Joined: UTC Posts: 1393 Location: Ukraine. Kyiv.	UTC quote SIP recommends to use 24 or higher carburetor with any of 177cc.

Bluecati UTC details Addicted Old douglas ..smallie with polini 115..super with nasco 177 Joined: UTC Posts: 685 Location: New Zealand
Bluecati Addicted Old douglas ..smallie with polini 115..super with nasco 177 Joined: UTC Posts: 685 Location: New Zealand	UTC quote 24 Did both...def 24/24 and I have done this lots of diff engines and many times. those that say the 20 is hard to "dial in" had seal or electrical issues and blamed the carb. 24 was game changer for top end and acceleration.....even on a stock 1 fiddy..and esp on a 177 tune No replacement for displacement (or a bigger hole ....errr....in the carb ) \good luck

SoCalGuy UTC details bodgemaster 63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150 Joined: UTC Posts: 7201 Location: So Cal
SoCalGuy bodgemaster 63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150 Joined: UTC Posts: 7201 Location: So Cal	UTC quote It depends on the build. I've run both on my moderately kitted 177 scoots, and honestly, there isn't much difference. The 24/24 adds maybe 1 mph top speed, while the 20/20 is more responsive and accelerates faster. If you have a more demanding engine... big ports, big inlet, cut crank, expansion pipe, etc.. a 24/24 might be the better choice, but otherwise 20/20 is fine.

rustyandtrusty

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Member

VLB1T

Joined: UTC
Posts: 21
Location: SF Bay Area

rustyandtrusty

Member

VLB1T

Joined: UTC
Posts: 21
Location: SF Bay Area

UTC quote

Re: 20/20 or 24/24 2t

grahamlml wrote:

I hear there is now a school of thought that the 20/20 carb is better on a 177 kit instead of the 24/24 carb. I not found any comments about the whys and wherefore's of this yet. Can anyone enlighten me please.

I have a Pinasco 177 (2-port) with a 20/20, and it's pretty good. I haven't tried the 24/24. Full disclosure: Running a SIP fast flow tap 2.0 with SIP road 2.0 exhaust.

Here's the carb set up:
Idle 55-160
Air Corrector: 160
Mixer: BE3
Main Jet:125

Polini venturi, and Pinasco carb cover (read: larger, more air, less restrictive)

Plug: NGK B8HS

Seems to work for me.

Good luck!

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