Model 2000 engine 250 - 380 usa – KTM 250 SX User Manual

Page 93

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Repair manual KTM 250 / 300 / 380

Art No 3206004 -E

9-10C

Engine

250 SX

250 EXC, MXC

300 EXC, MXC

380 SX

380 EXC, MXC

Design

Liquid-cooled single-cylinder two-str

oke engine with

KTM T

win

V

alve

C

ontr

ol exhaust system and

K

TM

T

or

que

C

hamber

Piston displacement

249 ccm

297 ccm

368 ccm

Bor

e / str

oke

66.4 / 72 mm (2.62 / 2.84 in)

72 / 73 mm (2.84 / 2.88 in)

78 / 77 mm (3 / 2.98 in)

Fuel

unleaded SUPER fuel, r

esear

ch octane no 95, mixed with high-grade two str

oke oil (Shell Advance Racing X)

Oil / gasolin ratio

1:40 – 1:60 when using high grade two str

oke oil. When in doupt, please contact your importer or use 1:40 mi

x ratio to be on the safe side

Crankshaft bearing

1 deep-gr

oove ball bearing / 1 cylinder r

oller bearing

Connecting r

od bearing

needle bearing

Piston pin bearing

needle bearing

Piston

cast piston

for

ged piston

cast piston

Piston ring

one plain compr

ession rings

two plain compr

ession rings

Dimension "X"

0 +0.1 mm (0 + 0.004 in)

Ignition timing

2.0 mm (0.07 in) (17 °) BTDC

2.2 mm (0.09 in) (17 °) BTDC

Spark plug

NGK

BR

8 ECM

Electr

ode gap

0.6 mm (0.024 in)

Dimension "Z"

50,5 mm (1.99 in)

46 mm (1.7 in)

50.5 mm (1.99 in)

TVC start open

5000/min

5300/min

5200/min

TVC fully open

7500/min

7750/min

7200/min

Primary drive

straight cut spur gears, primary ratio 25:72

straight cut spur gears, primary ratio 26:72

Clutch

multiple disc clutch in oil bath, hydraulic operated (Shell HF-E15)

Transmission

5 speed, claw actuated

Gear ratio

EXC

MXC

EXC

MXC

EXC

MXC

1

st

Gear

15:29

15:29

15:29

15:29

15:29

15:29

15:29

15:29

2

nd

Gear

17:27

18:26

17:27

18:26

18:26

18:26

18:26

18:26

3

rd

Gear

19:25

19:22

19:25

19:22

19:24

19:24

19:22

19:24

4

th

Gear

21:23

21:20

21:23

21:20

21:23

21:23

21:20

21:23

5

th

Gear

23:21

23:18

23:21

23:18

23:21

23:21

23:18

23:21

Gear lubrication

0.8 l engine oil 20W

-40 (Shell Advance VSX4)

A

vailable chain spr

ockets

13t / 14t / 15t for chain

5

/

8

x

1

/

4

"

Coolant

1.3 litr

es, 40% anti fr

eeze, 60% water

, at least -25 °C (-13 °F)

Ignition system

KOKUSAN 2K-4

KOKUSAN 2K-2

KOKUSAN 2K-1

KOKUSAN 2K-3

Generator output

no generator

12V 40W

no generator

12V 110W

Carbur

etor

flat-slide carbur

etor

, carbur

etor setting see table

Air

-filter

wet foam type air filter insert

(upper edge piston - upper edge cylinder)

(height of the contr

ol flap)

TECHNICAL DA

TA

- ENGINE 250/300/380 SX / MXC / EXC 2000 (only USA)

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