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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corrado
Dealer
Posts: 3209
Joined: Thu Jan 08, 2009 1:12 am
Main scooter: Lambretta GP
Location: Top of Blackpool Tower
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Tue Oct 01, 2013 12:08 am

Li 125 or RB250 ? ................ or something in between. :?

Andy W
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Posts: 165
Joined: Mon Jun 25, 2012 1:39 pm
Main scooter: GP 186 Imola
Location: Emsworth, Hampshire
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Tue Nov 12, 2013 4:27 pm

Here's my set up-

Imola 186 fast Road tuned by Dan
RB20 crank with 8mm packing plate
Li 150 box 16x47 sprockets
JL4
30PHBH run open mouthed behind panel
Main jet 132
Pilot 55
Needle X13 3rd clip
Float valve 300
Slide 40
Atomiser AV266
Surflex 4 plate with MBD springs
AF Rayspeed lightweight flywheel
17 degrees static
Set up by Dan @ 21.3BHP at the rear wheel

Will try a Fran Race to see I can get a bit more out of it, but well pleased so far

dave wheeler
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Posts: 260
Joined: Fri Feb 19, 2010 5:33 pm
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Fri Mar 07, 2014 8:40 pm

muggelo 186, jb tuned, 28mm del orto, breathsweet filter jl3 curly
40 slide
pilot 50
start 70
AQ 266
X7 2nd notch
main 108
17.8 bhp @ 6800

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Marty ULC
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Posts: 76
Joined: Thu Jan 02, 2014 9:41 am
Main scooter: curry burner GP225 mugello
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Tue Mar 11, 2014 10:38 pm

Mugello 186
19degrees
Indian big bore
PHBH26
Remote filter
108 main
50 pilot
AV264
X2 (top)
40 slide

Dynoed and carb set up by Dan, only makes 11.1 hp but is really smooth and easily pulls standard Indian GP200 gearing with a wife and all her luggage on the back 8-)

ericthered
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Posts: 29
Joined: Sun Apr 20, 2014 3:36 pm
Main scooter: GP 200 SIL
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Tue Apr 22, 2014 7:16 pm

Standard SIL GP200
AF Clubman exhaust.
Standard Indian stage 4 barrel. (Internal casting faults removed but not polished).
Inlet manifold smoothed and matched to barrel.
Exhaust U pipe/flange matched to barrel.
Standard Airbox/filter set up with airscoop but 5 x 10mm holes drilled in a row at the back of airbox about 20mm above the top of the actual filter (holes in this position seem to make a big differance as oposed to in the middle of the airbox or below where the filter sits).
Standard 22mm Jetax with 130 main and 48 pilot (I can run a 128 main for nipping about town with a bit better responce but gets a bit too hot at WOT)
NGK B7ES, gap set at 30th (Champion N4 works just as well).

Andy W
registered user
Posts: 165
Joined: Mon Jun 25, 2012 1:39 pm
Main scooter: GP 186 Imola
Location: Emsworth, Hampshire
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Thu Jun 12, 2014 4:31 pm

Here's my latest engine spec - Ongoing test engine

Std SIL St 4 200 barrel (not cleaned anything up or matched anything), Mahle thin ring piston, AF 9.5:1 head
Gp 150 gears with 18/47 sprockets and actually pulls this really well
BGM clutch with MB springs, deep crown wheel
28mm PHBH open mouthed
MJ - 116, Pilot - 56, slide - 40, Atomiser AV264, Needle X13 Top Clip, float valve - 300.
Taffy Copy exhaust
Set up after 140 miles running in to get closer set up rather than throwing fuel down to road everytime i rode it.(was just a tad rich!!)
Very happy with 14.5 bhp @ 6753 rpm and 11 lb/ft @ 6550 rpm.

This engine will be taking me to Euro Lambretta and once back will get some work done to barrel (match ports to gastes and transfers and may open them up a little!!) it's just got to survive the 1200 mile round trip.

Cereal GY
registered user
Posts: 43
Joined: Wed Sep 11, 2013 5:09 pm
Main scooter: GP200
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Sat Jul 19, 2014 7:09 pm

Mild tune TS1 225
30mm PHBH
19/46 gearing
Dev Tour exhaust
Timing 23.5 BTDC with Agusto 7000
24.2 BHP


Pilot 60
Choke 70
Slide 40
Atomiser AV 264
Needle X7 1.5 clip
Main 142

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drunkmunkey6969
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Posts: 4245
Joined: Sun Jan 04, 2009 1:42 pm
ebay user ID: sc00terotica
Main scooter: '69 Lambretta GP
Location: North Yorkshire
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Sat Jul 19, 2014 7:16 pm

That's a lean needle/clip/atomiser combo......

Cereal GY
registered user
Posts: 43
Joined: Wed Sep 11, 2013 5:09 pm
Main scooter: GP200
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Sat Jul 19, 2014 7:18 pm

Set up by Darrell Taylor, so pretty confident it's bang on the money.

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drunkmunkey6969
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Posts: 4245
Joined: Sun Jan 04, 2009 1:42 pm
ebay user ID: sc00terotica
Main scooter: '69 Lambretta GP
Location: North Yorkshire
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Sat Jul 19, 2014 7:19 pm

If you're happy, that's all that matters.

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