TECHNICAL DATA - ENGINE 74
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 64.85 cm³ (3.9574 cu in)
Stroke 40.8 mm (1.606 in)
Bore 45 mm (1.77 in)
Idle speed 1,400… 1,500 rpm
Control Exhaust control PCEV (Pneumatic Controlled Exhaust Valve)
Crankshaft bearing 2 grooved ball bearings
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Pistons Aluminum cast
Piston rings 1 rectangular ring
Engine lubrication Mixture oil lubrication
Primary transmission 23:75 straight cut spur gear
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear, claw shifted
Transmission ratio
1st gear 13:37
2nd gear 16:34
3rd gear 18:31
4th gear 21:30
5th gear 23:28
6th gear 24:26
Ignition Non-contact controlled fully electronic ignition system with digi-
tal ignition adjustment
Spark plug NGK LR 8 B
Spark plug electrode gap 0.60 mm (0.0236 in)
Cooling Water-cooled
Starting aid Kickstarter
Gear oil 0.50 l (0.53 qt.) Engine oil (15W/50) ( p. 82)
Coolant 0.55 l (0.58 qt.) Coolant ( p. 82)
Coolant (mixed ready to use) ( p. 82)
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