This jetting chart is for reference only. Because each engine is different and jetting requirements
vary with altitude and other climate factors, the precise jetting for your particular engine may vary.
For more detailed instructions on carburetor jetting, consult a proper tuning manual.
To see the manuals that we offer click here

Scooter Capacity Cylinder Bore Stroke Carb Exhaust Ignition Timing Compression Ratio/P.S.I. Main Jet Pilot Jet Needle Clip Position from Top Atomizer Atomizer Modifications Slide Cutaway
Li S3 186.6 Li150 64 58 Mikuni TM28 JL1 17 10:1/120 175 30 5EJ11 TOP 169-08 3MM 5mm
Li150 S3 189.5 Li150 64.5 58 Mikuni TM32 WCLW 304.A 23   270 45 6F21 2ND 389-QO   STD
Li150 186.6 Li150 64 58 Mikuni TM28 WCLW 304.A 23   300 15 5DP39 4TH 175-P8   2.5mm
GP200 198.4 TS1 66 58 Mikuni TM24 GP200 21   160 17.5 5N13 3RD 454-QO   STD
GP200 198.4 GP200 66 58 Mikuni TM28 GIANELLI 21   170 25 5EJ11 TOP 169-08 3.6MM 4.2MM
GP200 198.4 GP200 66 58 Mikuni TM28 GP200 21   185 35 5EJ11 TOP 169-08 2MM 4.2MM
Jet 200 198.4 RAPIDO 200 66 58 Mikuni TM28 WCLW 304.A 19   190 40 5EJ11 TOP 169-08 2.5MM 4MM
Li150 186.6 IMOLA 64 58 Mikuni TM28   19   310 22.5 5DP39 2ND 175-P8   STD
Li150 Special 186.6 IMOLA 64 58 Mikuni TM28 JL2 17   370 20 5L1 2ND 175-P8   4.25MM
GP200 212.1 TS1 200 66 62 Mikuni TM28 TAFFSPEED 17 138 450 12.5 5L1 2ND 175-P8   4.66MM
Li150 Special 186.6 Li150 64 58 Mikuni TM24 STOCK SERVETA 19   160 30 5N13 2ND STD   STD
GP200 223.2 TS1 225 70 58 Mikuni TM32 GIANELLI 21   300 32.5 6FJ6 TOP 389-Q2   STD
Li175 S1 175.1 Li150 S1 62 58 JETEX 22MM GP200 23   120 48     5899-2 DRILLED:2MM STD
GP200 223.2 TS1 225 70 58 Mikuni TMX35 TAFFSPEED     300 25 6EN11-54 TOP      
DL125 186.6 IMOLA 64 58 Mikuni TM28 GIANELLI     370 25 5DP39 2ND 175-P8 DRILLED:2.78MM 4MM
GP225 223.2 TS1 225 70 58 Mikuni TMX35 TAFFSPEED 18 10.14:1 380 27.5 6EN11-57 3RD      
Jet 200 210.6 JET 200 68 58 Mikuni TM28 WCLW 304.A225 19   185 35 5F21   169-08   4.2MM
Li150 186.6 Li150 64 58 Mikuni TM28 WCLW 304.A 23   300            
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