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ENGINE TOP END 5-23
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 t o 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 Removal).
•
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 i f
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]