KTM 250 EXC TPI User Manual

TECHNICAL DATA 22
157
22.1 Engine
22.1.1 All 250 models
Design 1-cylinder 2-stroke engine, water-cooled, with reed
intake, exhaust control and transfer duct injection
Displacement 249 cm³ (15.19 cu in)
Stroke 72 mm (2.83 in)
Hole 66.4 mm (2.614 in)
Idle speed 1,400 … 1,500 rpm
Exhaust control - setting measurement 2.7
+ 0.2
− 0
mm (0.106
+ 0.008
− 0
in)
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
Engine lubrication Separate lubrication
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) 49.0 mm (1.929 in)
Primary transmission 26:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Transmission 6 gear transmission, claw shifted
Transmission ratio
First gear 14:32
Second gear 16:26
Third gear 20:25
Fourth gear 22:23
Fifth gear 25:22
Sixth gear 26:20
Alternator 12 V, 196 W
Ignition system Contactless controlled fully electronic ignition with
digital ignition adjustment
Spark plug NGK BR 7 ES
Spark plug electrode gap 0.6 mm (0.024 in)
Cooling Water cooling, permanent circulation of coolant by
water pump
Starting aid Electric starter system
22.1.2 All 300 models
Design 1-cylinder 2-stroke engine, water-cooled, with reed
intake, exhaust control and transfer duct injection
Displacement 293.15 cm³ (17.8892 cu in)
Stroke 72 mm (2.83 in)
Hole 72 mm (2.83 in)
Idle speed 1,400 … 1,500 rpm
Exhaust control - setting measurement 2.3
+ 0.2
− 0
mm (0.091
+ 0.008
− 0
in)

KTM 250 EXC TPI Specifications

General

Brand	KTM
Model	250 EXC TPI
Category	Motorcycle
Language	English