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English – 109
Clean all parts, scrape off any gasket
residue remove carbon deposits from the
following areas:
1. The piston crown.
2. The top of the cylinder bore.
3. The cylinder exhaust port.
4. The decompression valve channel.
Cleaning and Inspection
PISTON AND CYLINDER
Check the following:
1. That the cylinder’s surface coating is not
worn, especially the upper part of the
cylinder.
2. That the cylinder is free of score marks.
3. That the piston is free of score marks.
See ”Faults and causes” on the next page.
Small scratches can be polished off using
fine emery paper.
4. That the piston ring is not stuck into its
groove.
5. Measure the piston ring wear by placing it
in the bottom of the cylinder bore and
measuring the gap and which should not
exceed 1 mm.
6. That the needle bearing is undamaged.
7. That the intake manifold is undamaged.
Max 1 mm
Pressure test the decompression valve as
follows:
1. Connect the tool 502 50 38-01 to the
decompression valve
2. Pump up the pressure to 80 kPa (0.8 bar).
3. Wait 30 seconds.
4. The pressure should not drop below 60 kPa
(0.6 bar).
Eng, p 83-124 96-09-13, 11.16109