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:

  1. Stock: includes opening the Lambretta underseat air scoop (because otherwise won't run).
  2. Stock+: means modifying the airbox for better flow (opening/drilling/etc.), but still uses the stock filter.
  3. Modern: includes all sponge, Ram, Uni, K&N, etc., types.
  4. Gauze: bellmouth filters often have a gauze mesh only.
  5. 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
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
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
Lambretta 225cc+ Rapido tuned Scorpion 28/30mm 144 46 JJH 3 3.5 none - Read
Lambretta 185cc+ SR tuned PM 28/30mm 140 40 JJH 4 3.5 none - Read
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
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
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
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
Vespa 125cc+ Malossi sport Polini 24mm 108 46 JJH 2 3.5 modern - Read
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
Lambretta 185cc+ Mugello tuned ScootRS 28/30mm 112 36 JJH 3 3.5 gauze - Read
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
Vespa 175cc+ Polini tuned JL 24mm 118 38 JJH 3 3.5 gauze - Read
Vespa 175cc+ Polini tuned JL 24mm 120 38 JJH 3 3.5 none - Read
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
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
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
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
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
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
Lambretta 200cc+ Rapido sport Clubman 28/30mm 118 40 JJH 4 3.5 none - Read
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
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
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
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
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
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
Lambretta 225cc+ stock sport Clubman 28/30mm 110 50 JJH 3 3.5 none - Read
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
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
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
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
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
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
Lambretta 90cc+ stock stock 24mm 100 30 GJH 2 2 stock high Read
Lambretta 90cc+ stock stock 28/30mm 100 30 GJH 1 2 stock high Read
Lambretta 125cc+ stock stock 24mm 100 30 GJH 1 2 stock high Read
Lambretta 90cc+ stock stock 24mm 100 30 GJH 3 2 stock high Read
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 -
Vespa 125cc+ other tuned Scorpion 28/30mm 100 30 JJH 3 3.5 none -
Lambretta 200cc+ stock Indian tuned ScootRS 28/30mm 124 40 JJK 3 3.5 modern - Read
Lambretta 200cc+ stock sport Clubman 28/30mm 116 40 JJH 2 3.5 modern low
Lambretta 150cc+ stock sport Leo Vinci 28/30mm 116 38 JJH 3 3.5 none -
Lambretta 185cc+ stock Indian sport Clubman 28/30mm 128 36 JJK 3 3.5 none -
Lambretta 175cc+ stock Indian sport Clubman 24mm 116 42 JJK 1 3.5 stock+ - Read
Vespa 175cc+ stock tuned Devtour 28/30mm 142 42 JJH 3 3.5 modern high
Lambretta 90cc+ stock stock 24mm 100 30 GJH 1 2 stock high Read
Lambretta 90cc+ stock stock 28/30mm 100 30 GJH 1 2 stock high Read
Lambretta 90cc+ stock stock 24mm 100 30 GJH 2 2 stock high Read
Lambretta 90cc+ stock stock 28/30mm 100 30 GJH 2 2 stock high Read
Lambretta 90cc+ stock stock 24mm 100 30 GJH 3 2 stock high Read
Lambretta 90cc+ stock stock 28/30mm 100 30 GJH 3 2 stock high Read
Lambretta 125cc+ stock stock 24mm 100 30 GJH 1 2 stock high Read
Lambretta 200cc+ stock Indian tuned other 28/30mm 138 42 JJK 2 3.5 gauze - Read
Vespa 200cc+ stock sport Simonini 28/30mm 128 30 other 1 3.5 gauze low
Lambretta 185cc+ SR sport Clubman 28/30mm 116 36 JJH 3 3.5 stock+ - Read
Vespa 200cc+ stock sport Sito 24mm 124 54 JJH 3 3.5 stock+ -
Lambretta 175cc+ stock sport Clubman 28/30mm 132 48 JJK 3 3.5 none - Read
Vespa 150cc+ Polini tuned Scorpion 28/30mm 118 50 JJH 3 3.5 stock+ -