KTM 450 XCR-W USA User Manual

00
AA
30/ENGINE - WORK ON INDIVIDUAL PARTS 87
Checking the valves
Info
The valve stem is chrome-hardened, and wear normally takes place in the valve guide.
200193-10
ಥ Check for valve retainer run-out.
Valve
Run-out on valve plate 싨0.05mm (싨0.002in)
» If the measured value does not equal the specified value:
ಥ Change the valve.
400373-10
ಥ Check sealing seat on the valve.
Valve
Sealing seat width, intake 1.5mm (0.06in)
Valve
Sealing seat width, exhaust 2mm (0.08in)
» If the sealing area is not in the center of the valve seat or if it differs from the
specified value:
ಥ Machine the valve seat.
Checking the valve springs
200190-10
ಥ Check the valve springs for breakage and wear (visual check).
» If the valve spring is broken or worn:
ಥ Change the valve spring.
ಥ Measure the valve spring length.
Valve spring
Minimum length, intake (without
bottom valve spring retainer)
46.5mm (1.83in)
Valve spring
Minimum length, exhaust (without
bottom valve spring retainer)
43mm (1.69in)
» If the measured value does not equal the specified value:
ಥ Change the valve spring.
Checking the lower valve spring retainer
500173-01
ಥ Check the lower valve spring retainer for breakage and wear (visual check).
» If the lower valve spring retainer is broken or worn:
ಥ Change the valve spring retainer.
ಥ Measure the thickness of the lower valve spring retainers.
Valve spring
Bottom valve spring retainer 0.9… 1mm (0.04… 0.04in)
» If the measured value does not equal the specified value:
ಥ Change the valve spring retainer.

KTM 450 XCR-W USA Specifications

General

Transmission	6-speed
Fuel Tank Capacity	8.5 L
Ignition	Keihin EMS
Compression Ratio	12.75:1
Starter	Electric starter
Lubrication	Pressure lubrication with 2 oil pumps
Subframe	Aluminum
Suspension Travel Front	300 mm
Suspension Travel Rear	310 mm
Engine Type	Single-cylinder, 4-stroke
Bore x Stroke	95 mm x 63.4 mm
Fuel System	Keihin EMS
Front Suspension	WP Xplor 48
Rear Suspension	WP Xplor PDS shock absorber
Front Brake	Disc brake
Rear Brake	220 mm disc
Cooling	Liquid cooled
Clutch	Wet multi-disc clutch, hydraulically operated
Frame	Central tube frame made of chrome molybdenum steel