PWK Carburetor Jetting

Here is what others have used to jet their PWK carburetors from us. (You can add your own info here.)

Notes:

Cylinder sizes: 90cc+, 125cc+, 135cc+, 150cc+, 165cc+, 175cc+, 185cc+, 200cc+, 210cc+, 225cc+, 250cc+.

Air filters:

Stock: includes opening the Lambretta underseat air scoop (because otherwise won't run).
Stock+: means modifying the airbox for better flow (opening/drilling/etc.), but still uses the stock filter.
Modern: includes all sponge, Ram, Uni, K&N, etc., types.
Gauze: bellmouth filters often have a gauze mesh only.
None: open carb, but includes gauze if the gauze is so big it does not restrict air flow at all. (Ours pictured above does restrict flow a bit.)

Weather/altitude:

Are you at a higher altitude, temperature, or humidity than average, or lower? (Higher makes you run richer so your jetting will be leaner than others need. Lower means you would jet richer than others need.)

This does NOT mean you are running lean or rich. Anything like that can be added to the notes below.

Click on the headers to sort the table.

Make	Cyl.	Type	Exhaust	Carb	Main	Idle	Needle	Clip	Slide	Filter	Weather/Altitude	Notes
Lambretta	200cc+	stock Indian	tuned ScootRS	28/30mm	108	42	JJH	3	3.5	stock+	high
Lambretta	200cc+	Mugello	tuned Taffspeed	28/30mm	130	36	JJH	2	3.5	modern	low
Lambretta	200cc+	stock	sport Clubman	28/30mm	116	56	JJH	2	3.5	modern	low	Read barrel is a taffspeed honda 205
Lambretta	200cc+	stock Indian	tuned NK	28/30mm	114	34	JJH	3	3.5	modern	-
Lambretta	200cc+	stock Indian	tuned ScootRS	28/30mm	114	32	JJH	3	3.5	modern	-
Lambretta	185cc+	SR	tuned ScootRS	24mm	108	34	other	1 top	3.5	modern	-
Lambretta	225cc+	TS1	tuned Scorpion	28/30mm	138	38	JJH	1 top	3.5	none	-
Lambretta	225cc+	TS1	tuned JL	28/30mm	148	38	JJK	3	3.5	gauze	-
Lambretta	185cc+	Mugello	tuned ScootRS	28/30mm	116	32	JJH	4	3.5	modern	-
Lambretta	200cc+	stock Indian	tuned other	28/30mm	120	32	JJH	2	3.5	none	-	Read Exhaust is an original DJ.
Lambretta	185cc+	Mugello	sport Clubman	28/30mm	122	42	JJH	2	3.5	modern	-
Lambretta	225cc+	Rapido	sport Clubman	28/30mm	120	40	JJH	3	3.5	modern	-
Vespa	125cc+	Polini	sport Polini	24mm	100	42	JJH	2	3.5	gauze	-	Read powerjet carb.
Lambretta	225cc+	Rapido	tuned Scorpion	28/30mm	144	46	JJH	3	3.5	none	-	Read the cylinder is race tuned with casing transfers opened to match barrel, running slightly rich as running motor in
Lambretta	185cc+	SR	tuned PM	28/30mm	140	40	JJH	4	3.5	none	-	Read SR barrel MB suzuki stage 5, AF crank ported bottom end
Lambretta	200cc+	stock Indian	tuned ScootRS	28/30mm	122	32	JJH	2	3.5	stock+	-
Lambretta	200cc+	stock Indian	tuned PM	28/30mm	120	40	JJH	1 top	3.5	modern	low	Read high comp head
Vespa	200cc+	stock	tuned JL	28/30mm	130	48	JJH	3	3.5	modern	-
Lambretta	200cc+	stock Indian	stock	28/30mm	108	36	JJH	2	3.5	modern	low
Vespa	185cc+	stock	tuned ScootRS	28/30mm	130	34	JJH	3	3.5	modern	-
Vespa	165cc+	Malossi	tuned Taffspeed	24mm	126	50	JJH	3	3.5	stock	-
Lambretta	200cc+	stock Indian	tuned PM	28/30mm	108	34	N80F	3	3	stock	-
Vespa	175cc+	Pinasco	tuned JL	28/30mm	126	48	other	3	3.5	modern	-
Lambretta	185cc+	Mugello	sport Clubman	28/30mm	112	40	JJH	3	3.5	none	-	Read have been running this up for 2yrs "motorway use for rallies" weather conditions sometimes need to weaken neadle by a notch
Lambretta	185cc+	Mugello	tuned JL	28/30mm	120	40	JJH	3	3.5	none	-
Lambretta	185cc+	stock	tuned JL	28/30mm	130	42	JJK	2	3.5	modern	-
Lambretta	200cc+	stock Indian	tuned ScootRS	28/30mm	110	32	JJH	3	3.5	none	-
Lambretta	200cc+	Mugello	tuned ScootRS	28/30mm	126	38	JJH	3	3.5	modern	-
Lambretta	200cc+	Mugello	tuned ScootRS	28/30mm	126	38	JJH	3	3.5	modern	low
Lambretta	200cc+	stock Indian	tuned Fresco	28/30mm	120	40	JJH	3	3.5	modern	-
Lambretta	175cc+	stock	sport Clubman	24mm	118	44	JJH	3	3.5	stock	-
Vespa	210cc+	Malossi	tuned JL	28/30mm	130	48	JJH	3	3.5	gauze	-
Lambretta	175cc+	SR	sport Clubman	28/30mm	116	36	JJH	3	3.5	modern	-	Read Inlet and exhaust ports opened out. Runs on RamAir filter behind panels
Lambretta	185cc+	SR	sport Clubman	24mm	108	44	JJH	3	3.5	stock+	-
Lambretta	200cc+	stock Indian	tuned ScootRS	28/30mm	130	38	JJH	2	3.5	modern	-	Read tried smaller mains,but plug looked weak finally settled for 130.Ignore previous settings on list 168 was typing error!
Vespa	125cc+	Malossi	sport Polini	24mm	108	46	JJH	2	3.5	modern	-	Read I put this carb on straight out of the box with a Polini 24mm Manifold (had to make a ring to match rubber boot) and ran bike strong with stock main and idle jets. I had to adjust the needle setting and air fuel mixture. Other than that the bike is running great!
Vespa	175cc+	T5	tuned JL	24mm	118	42	JJF	2	3.5	none	-
Vespa	175cc+	Polini	tuned JL	28/30mm	128	40	JJH	3	3.5	gauze	-	Read Modified 177er Polini, with JL RZ Mark One, opened the fuel Tab to 2,8mm, The clear float bowl was leaking so it was fix with the Red Würth Silicone.
Lambretta	185cc+	Mugello	tuned ScootRS	28/30mm	112	36	JJH	3	3.5	gauze	-	Read It still running in at 70 mph its amazing fast
Vespa	150cc+	Indian 5-port	sport Sito	24mm	108	32	JJH	3	3.5	modern	-
Lambretta	90cc+	Malossi	tuned other	24mm	118	42	JJH	3	3.5	gauze	-	Read cilinder 50 cc minarellie
Vespa	175cc+	Polini	tuned JL	24mm	118	38	JJH	3	3.5	gauze	-	Read I have an LML Reed Valve Motor With PKW 24 Carb. I like to Know the best put up for turing
Vespa	175cc+	Polini	tuned JL	24mm	120	38	JJH	3	3.5	none	-	Read i have a lml with a polini 177 a pkw 24 and a JL exhaust help me put up the proper jettin for this motor at low atitud and tropical weather
Lambretta	200cc+	Mugello	tuned JL	28/30mm	124	36	JJH	3	3.5	modern	-
Vespa	150cc+	T5	tuned ScootRS	24mm	130	40	JJH	3	3.5	modern	high
Lambretta	125cc+	stock	tuned JL	28/30mm	100	30	JJH	3	3.5	stock	-
Lambretta	185cc+	SR	tuned NK	28/30mm	128	40	JJH	3	3.5	none	high
Lambretta	175cc+	stock	sport Clubman	24mm	108	34	JJF	1	3.5	modern	-
Lambretta	175cc+	SR	tuned ScootRS	28/30mm	118	34	JJH	3	3.5	stock+	-
Vespa	210cc+	Polini	stock	28/30mm	128	48	JJH	3	3.5	modern	-	Read Is this configuration OK
Lambretta	225cc+	Rapido	tuned ScootRS	28/30mm	128	50	JJH	3	3.5	modern	-
Vespa	165cc+	Malossi	tuned Scorpion	24mm	134	50	JJH	3	3.5	modern	-
Lambretta	175cc+	SR	sport Clubman	24mm	110	38	JJF	1	3.5	stock+	-
Lambretta	175cc+	SR	sport Clubman	24mm	110	38	JJF	1	3.5	stock+	-
Vespa	150cc+	stock	sport Leo Vinci	24mm	120	48	JJH	3	3.5	stock+	-
Lambretta	200cc+	stock Indian	tuned ScootRS	28/30mm	122	46	JJH	2	3.5	gauze	-	Read Have tried many idle jets but to it right at 2 turns out it was 45. Also needle probably a touch rich so will get a JJK.
Lambretta	225cc+	TS1	tuned ScootRS	28/30mm	136	38	JJH	2	3.5	none	-
Lambretta	200cc+	Mugello	sport Clubman	24mm	104	32	JJH	3	3.5	modern	-
Lambretta	200cc+	Mugello	sport Clubman	24mm	104	32	JJH	3	3.5	modern	-
Vespa	150cc+	stock	stock	24mm	150	54	JJH	3	3.5	modern	-
Vespa	150cc+	stock	stock	28/30mm	100	42	N80F	2	3.5	none	-	Read no pick up but had marvelleous top speed
Vespa	175cc+	Pinasco	tuned JL	28/30mm	130	42	JJH	3	3.5	modern	-
Vespa	165cc+	Malossi	tuned ScootRS	28/30mm	120	44	JJH	3	3.5	modern	-
Vespa	150cc+	T5	tuned ScootRS	28/30mm	140	46	JJH	3	3.5	stock	-
Lambretta	185cc+	Deanspeed	tuned ScootRS	28/30mm	110	48	JJH	3	3.5	stock	-	Read Cylinder intake and exhaust opened up for big bore but Standard porting for kit
Lambretta	200cc+	stock	tuned other	28/30mm	126	50	other	2	4	modern	-
Vespa	210cc+	Malossi	tuned ScootRS	28/30mm	130	46	JJH	3	3.5	modern	-	Read Good with 128 main also. Watch for fuel line air pockets= starvation.
Vespa	150cc+	stock	stock	24mm	120	36	JJH	5	3.5	modern	-
Lambretta	175cc+	stock Indian	tuned Fresco	28/30mm	108	38	JJH	3	3.5	none	low
Vespa	200cc+	stock	tuned ScootRS	24mm	112	42	JJH	3	3.5	gauze	-	Read runs sweet as a nut
Lambretta	200cc+	Rapido	sport Clubman	28/30mm	118	40	JJH	4	3.5	none	-	Read running slightly rich
Lambretta	90cc+	stock	stock	24mm	110	30	JJH	3	3.5	stock	-
Lambretta	200cc+	Rapido	tuned Scorpion	28/30mm	132	42	JJH	3	3.5	modern	-
Lambretta	175cc+	stock	stock	24mm	120	40	JJH	3	3.5	stock	-
Lambretta	175cc+	stock Indian	stock	24mm	110	32	JJF	1	3.5	modern	-
Lambretta	175cc+	stock Indian	stock	24mm	110	32	JJF	1	3.5	modern	-
Lambretta	175cc+	Indian 5-port	stock	28/30mm	140	30	JJH	5	3.5	modern	-
Lambretta	175cc+	SR	sport Clubman	24mm	112	38	JJH	3	3.5	stock	high
Vespa	175cc+	Polini	stock	28/30mm	118	36	JJH	2	5	stock	-
Lambretta	175cc+	stock Indian	tuned PM	28/30mm	116	38	JJK	1	3.5	stock+	-	Read Indian ported S4 steel Barrel. Did have 112 main jet in but was running lean. Upped main jet to 116. Runs a dream.
Lambretta	185cc+	Imola	tuned NK	28/30mm	146	56	JJH	2	3.5	gauze	-
Lambretta	175cc+	SR	sport Clubman	24mm	110	32	JJH	2	3.5	stock	high
Vespa	225cc+	Pinasco	tuned ScootRS	28/30mm	136	42	GJH	4	3.5	modern	-
Vespa	210cc+	Malossi	tuned other	28/30mm	150	40	JJH	3	3.5	modern	-
Vespa	210cc+	Malossi	tuned Scorpion	28/30mm	150	38	JJK	1	3.5	none	-
Lambretta	225cc+	other	tuned other	28/30mm	126	34	JJH	3	3.5	none	-	Read takes about 20 kicks to get going any ideas
Lambretta	200cc+	stock Indian	sport Clubman	28/30mm	118	38	JJH	1	3.5	stock+	-
Lambretta	175cc+	stock	stock	24mm	118	50	JJH	3	3.5	stock	-
Vespa	175cc+	Pinasco	tuned Scorpion	28/30mm	130	32	JJH	3	3.5	none	-
Vespa	210cc+	Malossi	tuned JL	28/30mm	130	48	JJH	3	3.5	modern	-
Lambretta	225cc+	stock	tuned Fresco	28/30mm	122	32	JJH	2	3.5	none	-	Read very low comp. head squish 4.5mm No9 plug 2 Sthil oil semi syn. SX200 gearing ran for 3+ years over 7000 miles motorway 32000 + miles tot.used daily.
Vespa	175cc+	Pinasco	stock	24mm	116	36	JJH	3	3.5	stock	-
Lambretta	150cc+	stock	stock	28/30mm	118	34	JJH	2	3.5	stock	-
Vespa	225cc+	Pinasco	tuned JL	28/30mm	128	36	JJH	3	3.5	modern	-
Vespa	225cc+	Pinasco	tuned JL	28/30mm	128	46	JJH	3	3.5	modern	-
Lambretta	225cc+	Rapido	tuned JL	28/30mm	146	38	JJH	3	3.5	none	-
Vespa	175cc+	other	stock	28/30mm	136	38	JJH	3	3.5	stock	-
Vespa	175cc+	Quatrini	tuned other	28/30mm	120	50	JJH	2	3.5	none	low
Vespa	210cc+	Polini	sport Polini	24mm	120	58	JJH	3	3.5	stock+	-
Vespa	210cc+	Polini	tuned JL	24mm	120	54	JJH	3	3.5	stock	-
Vespa	175cc+	Quatrini	tuned other	28/30mm	126	46	JJH	3	3.5	modern	-
Vespa	165cc+	Malossi	sport other	24mm	126	50	JJH	3	3.5	modern	-
Lambretta	200cc+	stock	stock	28/30mm	102	50	JJH	3	3.5	stock	-
Vespa	175cc+	Pinasco	tuned JL	28/30mm	136	40	JJH	3	3.5	modern	-
Vespa	200cc+	stock	stock	24mm	118	48	JJH	3	3.5	stock	-
Lambretta	200cc+	Mugello	tuned PM	28/30mm	124	32	JJH	3	3.5	stock+	-	Read good low rpm and hi, ratio 5,3
Lambretta	200cc+	stock Indian	tuned Fresco	24mm	118	34	JJH	2	3.5	stock	-
Lambretta	225cc+	stock Indian	tuned Devtour	28/30mm	130	56	LJH	2	4	modern	low
Lambretta	225cc+	stock Indian	tuned Devtour	28/30mm	128	56	JJH	3	3.5	modern	-
Vespa	200cc+	stock	stock	28/30mm	100	30	JJH	1	3.5	none	-
Lambretta	90cc+	stock	sport Polini	28/30mm	146	40	JJH	2	3.5	stock+	-
Lambretta	185cc+	SR	tuned PM	28/30mm	122	34	JJK	3	3.5	none	-	Read Barel Ported to match inlet and Exuast, mEC Road/Race crank. Dyno setup by ReadSpeed
Vespa	125cc+	Parmakit	tuned other	28/30mm	130	50	other	3	4	none	-
Vespa	150cc+	T5	tuned ScootRS	24mm	108	30	JJH	3	3.5	stock+	-
Vespa	165cc+	Malossi	tuned JL	28/30mm	124	52	JJH	2	3.5	stock	-
Vespa	125cc+	T5	sport Simonini	24mm	122	56	JJH	3	3.5	stock	-
Lambretta	225cc+	Rapido	tuned NK	28/30mm	144	52	JJH	1	3.5	none	-
Vespa	210cc+	Malossi	tuned JL	28/30mm	130	38	JJH	3	3.5	stock+	high
Vespa	210cc+	Malossi	tuned JL	28/30mm	136	38	other	3	3.5	stock+	high
Vespa	175cc+	Polini	tuned ScootRS	24mm	120	56	JJH	3	3.5	stock+	-
Vespa	175cc+	DR	tuned other	24mm	104	36	GJH	1	3.5	gauze	-	Read Superb torque and acceleration, pulls 53 mph in 3rd, 70+ possible.
Lambretta	225cc+	stock	sport Clubman	28/30mm	110	50	JJH	3	3.5	none	-	Read 48mm clubbie,sweet as a nut
Lambretta	135cc+	stock	sport other	28/30mm	130	40	JJH	4	3.5	none	-
Vespa	210cc+	Malossi	tuned JL	28/30mm	134	36	JJH	3	3.5	modern	-
Vespa	175cc+	DR	tuned ScootRS	24mm	116	46	other	3	3.5	stock	-
Vespa	200cc+	stock	sport Sito	28/30mm	138	40	JJH	3	3.5	none	-
Vespa	210cc+	Pinasco	sport other	28/30mm	136	36	JJH	3	3.5	stock	-
Lambretta	150cc+	stock	tuned Scorpion	24mm	106	40	JJH	3	3.5	stock	-
Lambretta	185cc+	SR	sport Clubman	28/30mm	136	38	JJH	3	3.5	modern	-	Read Harry Barlow tuned Suzuki 193
Vespa	150cc+	Indian 5-port	tuned JL	24mm	122	48	JJH	3	3.5	modern	-
Lambretta	185cc+	Mugello	tuned JL	28/30mm	120	50	other	1	3.5	none	-	Read aprilia RS airbox,needle JJS
Vespa	125cc+	Polini	sport Simonini	28/30mm	120	52	JJH	3	3.5	stock	-
Lambretta	185cc+	Polini	tuned other	28/30mm	142	42	JJH	5	6	modern	-
Vespa	165cc+	other	tuned Taffspeed	28/30mm	130	50	other	3	3.5	none	-
Lambretta	175cc+	stock	tuned Scorpion	24mm	120	50	JJH	3	3.5	stock	-
Lambretta	225cc+	stock Indian	tuned JL	28/30mm	118	46	JJH	3	3.5	none	-	Read indiab ali 225 cyl,old jl swift pipe
Lambretta	200cc+	Rapido	tuned JL	24mm	136	46	JJH	3	3.5	modern	-
Lambretta	250cc+	Rapido	tuned JL	24mm	100	30	JJH	3	3.5	modern	-
Vespa	150cc+	stock	stock	24mm	100	32	JJH	3	3.5	stock+	low
Vespa	210cc+	Malossi	tuned other	28/30mm	134	42	JJH	3	3.5	modern	-
Lambretta	150cc+	stock	sport Clubman	24mm	108	30	JJH	3	3.5	stock	-
Lambretta	200cc+	stock	stock	24mm	100	30	JJH	3	3.5	stock	-
Lambretta	135cc+	Polini	stock	28/30mm	166	44	JJH	3	3.5	gauze	-	Read BION I'm ipmrseesd! Cool post!
Lambretta	175cc+	stock	sport Sito	28/30mm	118	48	other	3	3.5	modern	-
Lambretta	200cc+	Mugello	sport Clubman	24mm	100	34	JJH	3	3.5	modern	-
Vespa	200cc+	RaceTour	tuned Fresco	28/30mm	132	38	JJH	2	5	none	-
Lambretta	225cc+	GT	tuned Scorpion	28/30mm	130	40	JJH	3	3.5	none	high
Vespa	200cc+	stock	tuned other	24mm	128	54	JJH	3	3.5	stock	-
Lambretta	185cc+	SR	stock	24mm	118	48	JJH	3	3.5	stock	-
Vespa	200cc+	stock	sport Sito	24mm	124	54	JJH	3	3.5	stock+	-
Lambretta	175cc+	stock	tuned ScootRS	24mm	108	38	JJH	3	3.5	stock	-
Vespa	210cc+	Malossi	tuned JL	28/30mm	138	50	JJH	3	3.5	modern	-
Lambretta	175cc+	stock	tuned ScootRS	24mm	108	38	JJH	3	3.5	modern	-
Lambretta	175cc+	stock	tuned ScootRS	24mm	110	38	JJH	3	3.5	modern	-
Lambretta	165cc+	stock	sport Clubman	24mm	120	46	JJH	3	3.5	modern	-
Lambretta	225cc+	SR	tuned ScootRS	28/30mm	146	44	JJH	3	3.5	modern	-
Lambretta	185cc+	SR	sport Clubman	24mm	110	40	JJH	3	3.5	none	-
Vespa	200cc+	stock	stock	28/30mm	110	48	JJH	3	3.5	modern	-
Lambretta	200cc+	SR	sport Clubman	28/30mm	124	54	JJH	3	3.5	none	-	Read panels fitted, no hole!
Lambretta	175cc+	SR	sport Clubman	24mm	108	32	JJH	3	3.5	modern	-
Vespa	150cc+	stock	stock	24mm	116	46	JJF	4	5.5	stock	high
Lambretta	90cc+	stock	stock	24mm	100	30	GJH	1	2	stock	high	Read 1
Lambretta	90cc+	stock	stock	24mm	100	30	GJH	2	2	stock	high	Read 1
Lambretta	90cc+	stock	stock	28/30mm	100	30	GJH	1	2	stock	high	Read 1
Lambretta	125cc+	stock	stock	24mm	100	30	GJH	1	2	stock	high	Read 1
Lambretta	90cc+	stock	stock	24mm	100	30	GJH	3	2	stock	high	Read 1
Lambretta	200cc+	stock Indian	tuned ScootRS	24mm	126	50	JJH	3	3.5	stock	-
Lambretta	200cc+	Deanspeed	tuned Fresco	28/30mm	142	42	JJH	3	3.5	none	-

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