Checking The Camshaft; Checking The Timing Assembly; Preparing The Timing Chain Tensioner For Installation - KTM 450 EXC-R EU Repair Manual

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30/ENGINE - WORK ON INDIVIDUAL PARTS

Checking the camshaft

Checking the timing assembly

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0 0 1
5
0 0 5
3
0 0 3
4
0 0 4

Preparing the timing chain tensioner for installation

Mount a new lock ring
Check for correct functioning.
»
The autodecompression spring does not turn the autodecompression shaft fully
back to the stop:
Tighten the autodecompression spring or replace it.
200166-11
Check the camshaft for damage and wear.
»
If there is damage or wear:
Change the camshaft.
If the cam surface is damaged, check the oil supply to the camshaft and
rocker arm.
Measure the cams of the camshaft.
Camshaft - cam height
Intake
Camshaft - cam height (Every 450 models)
200206-10
Exhaust
Camshaft - cam height (Every 530 models)
Exhaust
»
If the measured value does not equal the specified value:
Change the camshaft.
Clean all parts well.
Check the timing chain wheel/timing chain sprocket
»
If there is damage or wear:
Change the timing chain wheel/timing chain sprocket.
2
0 0 2
Check timing chain tensioning rail
»
If there is damage or wear:
Change the timing chain tensioning rail.
Check timing chain guide rail
»
If there is damage or wear:
Change the timing chain guide rail.
Check timing chain securing guide
»
If there is damage or wear:
Change the timing chain securing guide.
1
0 0 1
Check timing chain
»
If there is damage or wear:
Change the timing chain.
Check that the timing chain links move easily. Let the timing chain hang down
freely.
»
If the chain links no longer straighten out:
Change the timing chain.
200173-01
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.
200171-10
.
33... 33.2 mm (1.3... 1.31 in)
33.9... 34.1 mm (1.33... 1.34 in)
34.2... 34.4 mm (1.35... 1.35 in)
for damage and wear.
for damage and wear.
for damage and wear.
for damage and wear.
84
for damage and wear.

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