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30/ENGINE - WORK ON INDIVIDUAL PARTS 84
200166-11
ಥ Mount a new lock ring.
ಥ Check for correct functioning.
» The autodecompression spring does not turn the autodecompression shaft fully
back to the stop:
ಥ Tighten the autodecompression spring or replace it.
Checking the camshaft
200206-10
ಥ Check the camshaft for damage and wear.
» If there is damage or wear:
ಥ Change the camshaft.
ಥ If the cam surface is damaged, check the oil supply to the camshaft and
rocker arm.
ಥ Measure the cams of the camshaft.
Camshaft - cam height
Intake 33… 33.2mm (1.3… 1.31in)
Camshaft - cam height (Every 450 models)
Exhaust 33.9… 34.1mm (1.33… 1.34in)
Camshaft - cam height (Every 530 models)
Exhaust 34.2… 34.4mm (1.35… 1.35in)
» If the measured value does not equal the specified value:
ಥ Change the camshaft.
Checking the timing assembly
200173-01
ಥ Clean all parts well.
ಥ Check the timing chain wheel/timing chain sprocket
 for damage and wear.
» If there is damage or wear:
ಥ Change the timing chain wheel/timing chain sprocket.
ಥ Check timing chain tensioning rail
 for damage and wear.
» If there is damage or wear:
ಥ Change the timing chain tensioning rail.
ಥ Check timing chain guide rail
 for damage and wear.
» If there is damage or wear:
ಥ Change the timing chain guide rail.
ಥ Check timing chain securing guide
 for damage and wear.
» If there is damage or wear:
ಥ Change the timing chain securing guide.
ಥ Check timing chain
 for damage and wear.
» If there is damage or wear:
ಥ Change the timing chain.
ಥ Check that the timing chain links move easily. Let the timing chain hang down
freely.
» If the chain links no longer straighten out:
ಥ Change the timing chain.
Preparing the timing chain tensioner for installation
200171-10
ಥ Fully compress the timing chain tensioner.
Info
This requires considerable force since the oil has to be pressed out.
Without pressure, the timing chain tensioner expands fully.
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