21 TECHNICAL DATA 112
21.1 Engine
21.1.1 TC 125
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 124.8 cm³ (7.616 cu in)
Stroke 54.5 mm (2.146 in)
Bore 54 mm (2.13 in)
Crankshaft bearing 1 grooved ball bearing/1 roller bearing
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Pistons Cast aluminum
Piston rings 2 half keystone rings
X (upper edge of piston to upper edge of cylinder) 0… 0.10 mm (0… 0.0039 in)
Z (height of control flap) 36.5 mm (1.437 in)
Primary transmission 23:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear, claw shifted
Transmission ratio
First gear 14:32
Second gear 15:30
Third gear 17:28
Fourth gear 20:28
Fifth gear 19:23
Sixth gear 22:24
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK BR9 ECMVX
Spark plug electrode gap 0.60 mm (0.0236 in)
Starting aid Kick starter
21.1.2 TC 250
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 249 cm³ (15.19 cu in)
Stroke 72 mm (2.83 in)
Hole 66.4 mm (2.614 in)
Exhaust valve, beginning of adjustment 5,125 rpm
Crankshaft bearing 1 grooved ball bearing/1 roller bearing
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Piston Cast aluminum
Piston rings 2 half keystone rings
X distance (upper edge of piston to upper edge of cylinder) 0… 0.10 mm (0… 0.0039 in)
Z distance (height of control flap) 49 mm (1.93 in)
Primary transmission 26:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Transmission 5-gear, claw shifted
Transmission ratio
First gear 14:28
Second gear 16:26
Third gear 18:24
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