128
Technical data
2036 2040 2041 2045 2050 2054 2055 625 630 670 2077 2083 2095
Capacity, cm
3
36.3 40.2 40.2 44.3 48.7 53.2 53.2 61.5 61.5 66.8 76.5 82.4 93.6
Cylinder diam., mm 38.0 40.0 40.0 42.0 44.0 46.0 46.0 48.0 48.0 50.0 52.0 54.0 56.0
Stroke length, mm 32.0 32.0 32.0 32.0 32.0 32.0 32.0 34.0 34.0 34.0 36.0 36.0 38.0
Compression ratio 8.0 8.0 10.5 10.5 10.5 10.5 10.5 10.1 10.5 10.5 10.1 10.1 10.0
Revs at max. power, rpm 8500 8500 9000 9000 9000 9300 9600 9000 8800 10000 9600 10000 8200
Max. rpm 13000 13000 12500 12500 12500 13000 14500 12500 13000 13500 13500 13500 13000
Idling speed, rpm 3000 3000 2500 2500 2500 2400 2400 2700 2700 2700 2800 2800 2400
Clutch engagement speed, rpm 4500 4500 3600 3600 3600 3500 3500 3700 3700 3700 3500 3500 3200
Ignition system, type CD CD CD CD CD CD CD CD CD CD CD CD CD
Ignition system, manufacture Phelon Phelon Phelon Phelon Phelon EM EM EM EM EM EM EM EM
Plug, Champion RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ7Y RCJ6Y RCJ6Y
Plug, NGK BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A BPMR7A
Electrode gap, mm 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.7 0.7 0.7
Distance flywheel/ignition module, mm 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Carburettor, manufacture Walbro Walbro Zama Zama Zama Walbro Walbro Tillotson Tillotson Tillotson Walbro Walbro Tillotson
Carburettor, type WT289 WT289 CIQ-EL1 CIQ-EL1 CIQ-EL1 HDA119A HDA119A HS237A HS256A 230D WJ28B WJ28B 265A
Carburettor setting, H/L 2.0/2.0 2.0/2.0 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1 1/4 1.0/1 1/4 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0
Fuel tank, litres 0.40 0.40 0.50 0.50 0.50 0.56 0.56 0.73 0.73 0.73 0.85 0.85 0.90
Oil tank, litres 0.20 0.20 0.25 0.25 0.25 0.38 0.38 0.40 0.40 0.40 0.40 0.40 0.70
Oil pump capacity at 6000 rpm, ml/min 7.0 7.0 6.0 6.0 6.0 3.0–7.0 3.0–7.0 3.5,7.0 3.5, 7.0 3.5, 7.0 4.0–20.0 4.0–20.0 9.0–22.0
9.0,13.0 9.0, 13.0 9.0, 13.0
Chain gear, number of cogs 7 7 7
Chain pitch, inches .325 .325 .325 .325 .325 .325 .325 3/8 3/8 3/8 3/8 3/8 3/8
3/8 3/8
Bar length, inches 13–16 13–16 13–18 13–18 13–18 13–18 13–18 15–24 15–24 15–24 15–24 15–28 15–28
Bar length, cm 33–41 33–41 33–46 33–46 33–46 33–46 33–46 38–61 38–61 38–61 38–61 38–71 38–71
Chain speed at max. power, m/s 15.5 16.3 17.3 17.3 17.3 18.0 18.5 22.9 24.4 24.4 24.4 21.3 21.5
Tightening torque, Nm
Plug 20–22 20–22 20–22 20–22 20–22 20–22 20–22 20–22 20–22 20–22 20–22 20–22 20–22
Clutch 30–35 30–35 30–35 30–35 30–35 30–35 30–35 30–40 30–40 30–40 20–22 20–22 30–40
Flywheel 25–30 25–30 25–30 25–30 25–30 25–30 25–30 30–40 30–40 30–40 30–35 30–35 30–40
Starter device 2–3 2–3 2–3 2–3 2–3 2–3 2–3 3–4 3–4 3–4 2–3 2–3 2.5–4
Carburettor 3–4 3–4 3–4 3–4 3–4 3–4 3–4 4–6 4–6 4–6 1.5 1.5 5–6
Cylinder 10–12 10–12 10–12 10–12 10–12 10–12 10–12 8–10 8–10 8–10 8–10 8–10 10–12
Silencer 7–8 7–8 7–8 7–8 7–8 7–8 7–8 7–8 7–8 7–8 13–15 13–15 10–12
Crankcase –––––––7–97–97–97–97–97–9
Decompression valve –––––––– –––12–14 12–14
10
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