TECHNICAL DATA - ENGINE 85
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 248.60 cm³ (15.1706 cu in)
Stroke 54.80 mm (2.1575 in)
Bore 76 mm (2.99 in)
Compression ratio (SX‑F EU/USA, XC‑F) 13.2:1
Compression ratio (SX‑F ROCZEN REPLICA) 13.7:1
Idle speed 2,150… 2,250 rpm
Control DOHC, four valves controlled via cam lever, drive via tooth-wheel
chain
Valve diameter, intake 30.0 mm (1.181 in)
Valve diameter, exhaust 26.0 mm (1.024 in)
Valve clearance
Exhaust at: 20 °C (68 °F) 0.12… 0.17 mm (0.0047… 0.0067 in)
Intake at: 20 °C (68 °F) 0.10… 0.15 mm (0.0039… 0.0059 in)
Crankshaft bearing 2 cylinder bearings
Conrod bearing (All SX‑F models) Needle bearing
Conrod bearing (XC‑F) Sleeve bearing
Piston pin bearing (All SX‑F models) Bronze bush
Piston pin bearing (XC‑F) Not a bearing bush - DLC-plated piston pins
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with two rotary pumps
Primary transmission 22:68
Clutch Multidisc clutch in oil bath/hydraulically activated
Transmission 6-speed dog engagement
Transmission ratio (All SX‑F models)
1st gear 13:32
2nd gear 15:30
3rd gear 17:28
4th gear 19:26
5th gear 21:25
6th gear 22:24
Transmission ratio (XC‑F)
1st gear 13:33
2nd gear 17:33
3rd gear 19:29
4th gear 23:28
5th gear 23:23
6th gear 26:22
Alternator 12 V, 66 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK CR 9 EKB
Spark plug electrode gap 0.7 mm (0.028 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Starting aid (All SX‑F models) Electric starter
Starting aid (XC‑F) Kick starter and electric starter
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