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Setting the carburettor
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Setting the carburettor
The main reasons for unreliable engines and seizures are not mechanical failures but incorrect ignition timing and badly set-up carburettors. There is no such thing as a touring or in-town setting, only a correct one. Unfortunately this is not as easy to find as the ignition timing, also the results are not as easy to check. Still we want to help you finding the correct setting for your engine. This can only be done for each engine individually, even if our spreadsheet gives you a first rough starting point for setting your engine. You might feel that this is a very complex and even scary thing in the first place, but with a little general knowledge, the whole affair is only half as complicated as it looks. A typical indicator for the setting is the spark plug colour. The problem with this is that unleaded fuel and fully-synthetic two-stroke oils make this much harder to see than in the old days, especially with good spark plugs which burn the fuel very effectively. However as a rough guide it is still a worthwhile check. You will have to do this directly after a run on full throttle, ideally switch the ignition off while you are still on full throttle (and pull the clutch of course). A very light colour (grey or white) indicates that the engine runs got the mixture is lean. A black or even oil-covered spark plug shows that the mixture is too rich. The classic recommendation is that the spark plug colour should be a dark chocolate brown colour.
Setting recommendations Please be aware that this is a guide only so that you don't have to start from scratch when setting up your carb. The figures stated stem from a number of different but well working engines. We strongly recommend starting with a richer setting than the one given here and then working downwards gradually. Cylinder 175 (tuned) 175 (tuned) 175 (tuned) 185 Imola 200 Stage 4 200 Stage 4 200 Stage 4 200 Stage 4 200 Stage 4 200 Stage 4 200 Stage 4 200 Stage 4 200 Stage 4 Rapido Classic 200 cc Rapido Classic 200 cc Rapido Race 200 cc Rapido Race 200 cc Rapido Race 225 cc Rapido Race 225 cc Rapido Race 250 cc TS 1 200 cc TS 1 200 cc TS 1 200 cc TS 1 200 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 225 cc TS 1 240 cc TS 1 225 cc
Carb Dellorto SH20 Jetex Mikuni TM 24 Dellorto PHBH 30 Dellorto SH20 Dellorto PHBL 25 Dellorto PHBH 28 Dellorto PHBH 30 Jetex Mikuni TM 24 Mikuni TM 28 Mikuni TM 28 PWK 28 Dellorto PHBH 30 Jetex Dellorto PHBH 30 Mikuni TM 28 Dellorto PHBH 30 Dellorto PHBH 30 Dellorto PHBH 30 Amal 30 Amal 34 Dellorto PHBH 30 Dellorto VHSB 34 Amal 30 Amal 34 Dellorto PHBH 30 Dellorto PHBH 30 Dellorto PHBH 30 Dellorto VHSA 32 Dellorto VHSB 34 Dellorto VHSB 34 Mikuni TMX 32 Mikuni TMX 35 PWK 28 PWK 32 Mikuni TMX 35 Mikuni TMX 30
Main jet 112 108 123 - 112 155 130-120 106 83 125- 115 130- 120 126 - 118
Pilot jet 45 48 Std. 15 55 50 44 70- 50 70- 50 Std.
Atomiser 5899-2 / 4 Std. 169-P0 AV266 5899-2 264 AV268-262 AV268-262 Std.
Needle 5EJ11 X7 D 22 X7-13-2-26 X7-13-2-26 -
170 190 125 122 126 - 118 126 190 128 128 130 320-300 350-320 150-135 175-160 320-300 360-340 146-142 128 155-140 165-140 175-160 200-155 280 320 140 145 320
35 40 50 55 45 55 40 50 55 55 35 35 55 55-45 35 35 70 55 55 45- 40 55-45 45- 40 35 6020 55 58 60-20
169-08 169-08 Std. AV266 5899-2 AV266 169-08 AV266 AV266 AV266 107 107 AV266 DQ/DP 266 107 107 AV266 AV264 AV266 DQ266-262 DQ/DP 266 DQ266-264 Q2 Std. Std. -
5EJ11 5EJ11 Std. X7 X7 5EJ11 X13 X7 X7 2D1 2D1 X7 K 21 / K 24 2D1 2D1 X2 X32 X7 K21-22-28-23-27 K21 / K24 K21-22-28-23-27 6FJ6 6ENM-85 Std. Std. 6ENM-85