OP
@grahamlml avatar
UTC

Addicted
Vespa GTS 250 , Baotian 70cc rat scooter, Yamaha V50M 1979
Joined: UTC
Posts: 570
Location: Wales
 
Addicted
@grahamlml avatar
Vespa GTS 250 , Baotian 70cc rat scooter, Yamaha V50M 1979
Joined: UTC
Posts: 570
Location: Wales
UTC quote
I am new to these carbs no not sure if my main, air corrector, mixer tube and idle jet combo ok
Lml 125 with 150 top end on and just fitted at SIP road 2 in place of the bean tin looking affair

I have done a full throttle run and checked plug pics below.
I understand you have to do a run in the lower rev range to make sure the right idle jet is fitted but confused as to how.
Running
Bpr6es plug
Air corrector 140
Mixer tube b3
Main jet 100
Idle jet I think is 55/160
Air filter is not drilled
New barrel and piston done about 150 miles
Many thanks in advance
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UTC

Member
09 stella
Joined: UTC
Posts: 17
Location: bay city,michigan
 
Member
09 stella
Joined: UTC
Posts: 17
Location: bay city,michigan
UTC quote
with a new top end you should probably bump up to a 105 main and run in the top end first and then revisit plug chops. and maybe a 7 plug unless your riding short trips only.
@orange_s150 avatar
UTC

Molto Verboso
S 150, VNB 150, 101 Allstate, 01 ET2
Joined: UTC
Posts: 1488
Location: CT
 
Molto Verboso
@orange_s150 avatar
S 150, VNB 150, 101 Allstate, 01 ET2
Joined: UTC
Posts: 1488
Location: CT
UTC quote
Oops worng post.
UTC

Jet Eye Master
PX221 MHR, PX200 O tuned, PX181 M1XL, PX125 O tuned and some motorbikes
Joined: UTC
Posts: 4782
Location: London UK
 
Jet Eye Master
PX221 MHR, PX200 O tuned, PX181 M1XL, PX125 O tuned and some motorbikes
Joined: UTC
Posts: 4782
Location: London UK
UTC quote
105MJ is a good call
The B6 plug looks ok at this point
Air corrector 140
Mixer tube BE1
The idle jet at 55/160 will be too big but change this after a few hundred more miles.
OP
@grahamlml avatar
UTC

Addicted
Vespa GTS 250 , Baotian 70cc rat scooter, Yamaha V50M 1979
Joined: UTC
Posts: 570
Location: Wales
 
Addicted
@grahamlml avatar
Vespa GTS 250 , Baotian 70cc rat scooter, Yamaha V50M 1979
Joined: UTC
Posts: 570
Location: Wales
UTC quote
Just checked idle jet and it's a 40/130 and I increased the main to a 102 starting to look better. Could not find other my jets earlier with 105 in.
What do you think re the plug colour now?
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UTC

Jet Eye Master
PX221 MHR, PX200 O tuned, PX181 M1XL, PX125 O tuned and some motorbikes
Joined: UTC
Posts: 4782
Location: London UK
 
Jet Eye Master
PX221 MHR, PX200 O tuned, PX181 M1XL, PX125 O tuned and some motorbikes
Joined: UTC
Posts: 4782
Location: London UK
UTC quote
Pilot jet has gone from probably too big to certainly too small. Not sure what a stock LML pilot is but the Vespa one is usually 48/160.
Plug is looking one jet too lean but upping the pilot jet should fix that. While running in should really be over, so have another look for the 105 as well as a bigger pilot jet.
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