OP
@whereshaldo avatar
UTC

Hooked
Stella 2T 150, Honda C70
Joined: UTC
Posts: 416
Location: Seattle
 
Hooked
@whereshaldo avatar
Stella 2T 150, Honda C70
Joined: UTC
Posts: 416
Location: Seattle
UTC quote
I know the easiest way to answer my question is just to try some things but I'm still slightly unhappy with the spluttering I get coming from closed throttle through the first 25% of the grip rotation. Once I get past that then the main really kicks in and it takes off but the idle circuit is still very spluttery both when starting off and when low speed rolling in city traffic.

Currently I've got a 55/160 installed (Stella with a BGM 177 and a main stack of a AC120-E3-118MJ)

I have the original Stella 40-130 jet which would give me a 3.25 ratio vs the richer 55-160 that is a 2.91. It seems like jumping from 2.91 to 3.25 is pretty significant and that I'd be better with a small change to a 40-120 or a 45-140.

I still don't see huge changes playing with the air mix screw so I'm assuming my pilot jet is still pretty rich but I'm also concerned about ending up too lean coming off throttle and causing some issues.

Any sage advice? I need to order some other little bits so its a good time to throw in a couple of jets as I already have to pay shipping.

Hal
@swiss1939 avatar
UTC

Ossessionato
P208, Stella VMC Stelvio 187, Stella 150, VNX1T, V9A1T, V9B1T, 02 Sportster XLH1208
Joined: UTC
Posts: 4110
Location: Staten Island, NY
 
Ossessionato
@swiss1939 avatar
P208, Stella VMC Stelvio 187, Stella 150, VNX1T, V9A1T, V9B1T, 02 Sportster XLH1208
Joined: UTC
Posts: 4110
Location: Staten Island, NY
UTC quote
Try 45/140 then 40/120. You'll probably land on one of those. I think I'm on 40/120
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4538
Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4538
Location: London UK
UTC quote
This is the difficult part. Whats on top of the carb, drilled filter?
OP
@whereshaldo avatar
UTC

Hooked
Stella 2T 150, Honda C70
Joined: UTC
Posts: 416
Location: Seattle
 
Hooked
@whereshaldo avatar
Stella 2T 150, Honda C70
Joined: UTC
Posts: 416
Location: Seattle
UTC quote
Yeah the drilled P200 filter
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4538
Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4538
Location: London UK
UTC quote
And slide 04?
OP
@whereshaldo avatar
UTC

Hooked
Stella 2T 150, Honda C70
Joined: UTC
Posts: 416
Location: Seattle
 
Hooked
@whereshaldo avatar
Stella 2T 150, Honda C70
Joined: UTC
Posts: 416
Location: Seattle
UTC quote
Oh jesus, I haven't even gotten to slides yet. I know from my C70 world that they are really important but I'm trying to only change one element at a time.

H
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4538
Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX125 and some motorbikes
Joined: UTC
Posts: 4538
Location: London UK
UTC quote
The slide is important for the first half throttle. 04 is the usual original one. Just look down the carb and see the number.

While you're in the carb looking, change the E3 to BE4 and report back what happens.
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: 0.0078s ][ Queries: 3 (0.0015s) ][ live ][ 313 ][ ThingOne ]