Kawasaki WORKHORSE 250 (2003) [81/322] Cam height

ENGINE TOP END 4-17

Camshaft

Camshaft Removal

•

Remove:

Camshaft Sprocket (see Camshaft Sprocket Removal)

Rocker Shaft Retainer (see Rocker Arm and Shaft Re-

moval)

•

Pull the camshaft [A] straight out of the head.

Camshaft Installation

•

Blow the oil passage with compressed air [A].

•

Apply molybdenum disulfide oil to the cam lobes [A].

•

Carefully push the camshaft into the cylinder head with

the cam lobes “down”.

Cam Wear Inspection

•

Measure the height [A] of each cam lobe with a microm-

eter.

If the cam height is less than the service limit for either

lobe, replace the camshaft.

Cam Height

Standard Service Limit

Exhaust 39.720 ∼ 39.828 mm 39.62 mm

(1.5638 ∼ 1.5680 in.) (1.560 in.)

Inlet 40.395 ∼ 40.503 mm 40.30 mm

(1.5904 ∼ 1.5946 in.) (1.587 in.)

Camshaft Bearing Inspection

•

Check the ball bearing which is press-fitted on the

camshaft.

○

Since the ball bearing is made to extremely close toler-

ances, the wear must be judged by feel rather than mea-

surement. Clean the bearing in a high flash-point solvent,

dry it (do not spin the bearing while it is dry), and oil it with

engine oil.

○

Spin the bearing by hand to check its condition.

If the bearing is noisy, does not spin smoothly, or has any

rough stops, replace it.