DR ALL-TERRAIN Service Manual download pdf (Page 204)

100

101

5-22 ENGINE TOP END

Camshaft

KACR Inspection

The Kawasaki Automatic Compression Release (KACR)

momentarily opens the exhaust valves on the compression

stroke at very low speeds. This allows some of the com-

pression pressure to escape, making it easy to turn over

the engine during starting.

Due to the simplicity of the mechanism, no periodic main-

tenance is needed. There are only two symptoms of prob-

lems with the KACR mechanism [A]: compression is not re-

leased during starting, and compression is released during

running.

(1) If compression is not released during starting, the

weights are not returning to their rest position.

•

Remove the camshaft (see Camshaft R emoval).

•

Remove the KACR unit.

•

Visually inspect the spring.

If damaged, deformed, or missing, replace the spring.

•

Remove the spring and move the weights back and forth.

If the weights do not move smoothly, replace the KACR

unit. Also inspect the exhaust rocker arm for any damage,

and replace the rocker arm if necessary.

[A] Rest Position (compression is released)

[B] Weights

[C] Spring

(2) If compression is released while the engine is running,

the weights are not swinging out.

•

Remove the spring and move the weights back and forth.

If the weights do not move easily from the retracted po-

sition, replace the KACR unit. Also inspect the exhaust

rocker arm for any damage, and replace the rocker arm if

necessary.

[A] Running Position (compression is not released)

[B] Weights

[C] Spring

KACR Removal

•

Remove:

Camshaft (see Camshaft Removal)

Camshaft Sprocket Bolts [A]

KACR Unit [B]

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DR ALL-TERRAIN Service Manual Page 204

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