Westfalia FM BK 55/50 Operating Instructions Manual page 88

Chain oil Check oil level
does not
flow
Blocked oil flow
openings
Poor quality /
wrong grade oil
Oil leaks Incorrect fuel
out of mixture, too
exhaust much oil
muffler
Troubleshooting
Top up oil.
Clean the oil flow ports and
passages.
Drain and use correct fuel mix
(Oil/Fuel mix ratio 1:40).
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