Insert the shaft [B] as shown.
Camshaft Sprocket Bolts
Camshaft Sprocket Cover
The Kawasaki Automatic Compression Release (KACR)
momentarily opens the valve on the compression stroke at
very low speed. This allows some of the compression pres-
sure to escape, making it easy to turn over the engine during
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
(1) If compression is not released during starting, the weight
is not returning to their rest position.
Remove the KACR unit.
Visually inspect the spring [A].
If damaged, deformed, or missing, replace the weight.
Check that the weight arm [B] move back and forth.
If the weight do not move smoothly, replace the KACR
unit. Also inspect the inlet rocker arm for any damage,
and replace the rocker arm if necessary.
[C] Rest Position (compression is released)
(2) If compression is released while the engine is running,
the weights are not swinging out.
Check that the weight arm [A] move back and forth.
If the weight do not move easily from the retracted posi-
tion, replace the KACR unit. Also inspect the inlet rocker
arm for any damage, and replace the rocker arm if nec-
[B] Running Position (compression is not released)
Camshaft Bearing Inspection
Visually inspect each camshaft bearing [A].
If there is any damage replace the camshaft.
Turn the bearing back and forth while checking for rough-
ness or binding.
If roughness or binding is found, replace the camshaft.
If it is noisy, does not spin smoothly, or has any rough
spots, replace the camshaft.
ENGINE TOP END 4-13