Lambretta Carb Set-ups.....

Check here for a list of various carb set-ups to help with jetting and all aspects of carb trickery!
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registered user
Posts: 596
Joined: Fri Feb 13, 2009 7:18 pm
ebay user ID: scootrogcat
Main scooter: Indian GP200
Location: SWINDON (Wilts)

Sat Mar 21, 2009 12:31 am

Engine: SIL 200 factory stage 4
Exhaust: Indian KBA Clubman
Carb: Dellorto(Spaco) SH2/22
Main jet: 123
Pilot: 48/50
SX150 Gearbox
18/47 sprockets
82 link chain

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Posts: 1283
Joined: Thu Jan 08, 2009 12:08 am
Main scooter: '70 GP150 [TS1 225]
Location: Merseyside

Thu Apr 02, 2009 12:04 am

Engine: v2 Mugello 186, matched inlet and exhaust, 125 Special gearbox, 47/18 sprockets
Carb: bgm Keihin copy PWK 28 with CamLam long RamAir filter through the panel.
Pilot: 42
Needle; GJH- 2nd clip from top.
Main; 128.
Float set at 22mm.
Timing: 18deg. Electronic.
Exhaust: PM 25 expansion.
Having run all sorts of different configurations over the past couple of years, this is the best I've had. Carb came with a bgm needle marked "28" which proved a bit rich. I tried a JJK thinking this would be leaner over half throttle only to find the opposite. Fitted a GJH and it transformed the midrange but needed the main lifting from 115 to 128.
Last edited by storkfoot on Sun May 10, 2009 6:02 pm, edited 2 times in total.

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Posts: 3
Joined: Sun Jan 11, 2009 1:08 pm

Fri Apr 10, 2009 4:35 pm

Engine = TS1 230
Standard Cylinder/Matched cases
Squish = 1.2mm
Exhaust = JL3
Timing =18*
Carb = Dellorto 34mm open mouth with panels
Main Jet = 170
Needle =K21 (t2)

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Muttley McLadd
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Posts: 2554
Joined: Wed Jan 07, 2009 6:32 pm

Fri Apr 10, 2009 10:20 pm

Engine: Suzuki 185
Standard Mazuchelli crank
Old AF ignition
Li150 box with 16T primary
Four plate clutch.
TMX35: 250 main/58 needle on top clip/20 pilot. No filter, full panelwork.

18hp and 13ft-lbs torque. Both at just under 7500 revs.

Posts: 82
Joined: Wed Jan 07, 2009 4:37 pm
ebay user ID: big-bad-barry
Main scooter: 1970 GP 195cc A/F s'type
Location: Waterlooville Hampshire

Mon Jun 08, 2009 10:28 am

Barrel: TS1 MB touring tune ceramic 71mm bore + 2.0 packer
Crank: MB alpha 60mm with 110 rod
Indian flywheel and stator 17 degs BTDC
Li125 box with 18T X 47T primary,(4.8 top ratio)
Six plate clutch, spacer type with very light springs.
Devtour exhaust.
Jimmers inlet manifold.
Mikuni TMX 35: 315 main, 57 needle on third clip, 22.5 pilot, No filter just rubber elbow,
A/F heavy head spigoted and squish set at 1.5, 9.5 comp ratio. (most of the stroke increase is in the head)
Champion N3C plug
23.55hp and 18.35ft-lbs torque. Both at just under 7000 revs. on dyno at euro 2009.
Too much for me will now give the engine to my son for his GP project, so its back to the rappido for me.

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Posts: 16
Joined: Mon Jan 12, 2009 2:41 pm

Sat Jun 13, 2009 12:30 pm

Aluminium ported af 175 kit
Sterling pipe
22mm Jetex
130 main
50 pilot
Remote filter
16/46 sprocks with Li 150 box.
Running in at mo so running pretty rich, ran like a bag with a 123 in, may lower to a 128 when run in,I think personally that with Jetex carbs you never get two the same,I also used a shorter float needle out of another jetex carb to let more juice into the bowl....So far so good...everyhing crossed :?

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Posts: 1495
Joined: Sun May 03, 2009 2:01 pm
Main scooter: GP RS200 Iron barrel

Wed Jun 17, 2009 9:44 pm

RS200 road tuned iron barrel
PM pipe (now JL3)
Timing 19 degrees
PHBH28 no filter
Needle x13 on 2nd clip
AV264 Atomiser
115 main
55 pilot (i think).
No EGT gauge or any gadgets,never siezes.Ridden almost flatout from Southampton to Oxford last year up A34 with no grief.Its run with the PM for 3 years with this setup,only just changed to JL curly as it looked cool.

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registered user
Posts: 230
Joined: Wed Jan 07, 2009 1:13 pm
ebay user ID: lambrettaparts
Main scooter: Li150Special RT195
Location: Ashford, kent

Thu Jun 18, 2009 5:58 am

186 Mugello
28mm PHBH
Ram Air Filter
AF Rayspeed 42mm exhaust

118 Main
70 Choke
40 Slide
X7 needle (3rd clip, but may move to 2nd once i'm happy that plug colour is ok)
50 Pilot
AV266 Atomiser

starts first time, every time, pulls well at all throttle settings...

plug colour is spot on, been running for 500 miles so far
Li150 S2 1959. Li150 Special 1964. GP125 1970. Jet 200 Performer 1981. 1967 Sx150. 1959 Li150 S1. 1968 li125 Series 4

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registered user
Posts: 11
Joined: Wed Jan 07, 2009 10:20 pm

Sun Sep 13, 2009 9:00 pm

Ally barrel 175 kit (beedspeed) on S3 LiS150. Not tuned
AF Clubman 42mm
Standard air filter set up
Dellorto SH1/20
Starter - 50
Pilot - 50
Atomiser 5899-2
Main - 110

Still a tiny bit rich for running in

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registered user
Posts: 596
Joined: Fri Feb 13, 2009 7:18 pm
ebay user ID: scootrogcat
Main scooter: Indian GP200
Location: SWINDON (Wilts)

Sun Sep 13, 2009 9:58 pm

Indian GP200 SX150 Gears, 19x47 sprockets
KBA Clubman

Casa 210, ports lightly smoothed.
Jetex bored out to 26mm
130 main
55 pilot
fast flow air filter through airbox

A little rich on slow running but smooth as silk above 50MPH

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