23
TECHNICAL DATA
171
23.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
249 cm³ (15.19 cu in)
Stroke
61.1 mm (2.406 in)
Bore
72 mm (2.83 in)
Compression ratio
12.5:1
Control
DOHC, 4 valves controlled via cam lever, chain drive
Valve diameter, intake
29 mm (1.14 in)
Valve diameter, exhaust
24 mm (0.94 in)
Valve clearance, intake, cold
0.08… 0.12 mm (0.0031… 0.0047 in)
Valve clearance, exhaust, cold
0.13… 0.17 mm (0.0051… 0.0067 in)
Crankshaft bearing
2 slide bearings
Conrod bearing
Sleeve bearing
Pistons
Cast light alloy
Piston rings
1 compression ring, 1 tapered compression piston ring, 1 oil
scraper ring
Engine lubrication
Pressure circulation lubrication with two rotary pumps
Primary transmission
30:80
Clutch
Clutch in oil bath/mechanically activated
Transmission
6-gear, claw shifted
Transmission ratio
1st gear
12:32
2nd gear
14:26
3rd gear
19:27
Summary of Contents for RC 390
Page 1: ...OWNER S MANUAL 2016 RC 250 Art no 3213408en...
Page 2: ......
Page 18: ...4 VIEW OF VEHICLE 16 4 1 View of vehicle front left example S00777 10...
Page 20: ...4 VIEW OF VEHICLE 18 4 2 View of vehicle rear right example S00778 10...
Page 149: ...16 COOLING SYSTEM 147 Install the right side cover p 101...
