Puch 1980-1981 Maintenance Manual page 8

LUBRICATION AND MAINTENANCE
MAINTENANCE
Decarbonizing the engine
Carbon deposits on the cylinder head, piston crown and in the exhaust ports are normal with all
two-stroke engines and can eventually lead to trouble if not removed in time. Combustion deposits
from oil as well as from fuel must therefore be removed regularly.
Cylinder head and piston crown
Carbon deposits on the cylinder head a n d piston crown should be removed only with a soft, blunt edged
instrument to avoid damage to the light alloy casting. Scratching should be avoided since every new
scratch will collect more carbon in future use.
Only scaly deposits need be removed from the piston crown. There is no need to disturb the piston if it
is covered only by a uniform layer of oil carbon. Before refitting the cylinder head, thoroughly remove all
carbon deposits and scrapings from the cylinder wall with a non fraying soft cloth and smear the sur-
face lightly with motor oil. Turn over the engine a few times tomake sure it cranks easily. Clean the ma-
ting surfaces with a clean rag. Replace the cylinder head and tighten the four cylinder head nuts. Be
sure to tighten two cylinder head nuts diagonally across from each other before tightening the other two
nuts (7 ft/lb/10 Nm).
Exhaust port
In order to clean the exhaust port, remove the exhaust pipe.
Crank the engine over (with the spark plug removed to re-
duce compression) until the piston reaches its lowest point.
Remove the oil carbon from the exhaust port. Take care not
to damage the piston or cylinder surface. When cleaning
the exhaust port, it is also a good idea to clean the muffler.
Cleaning the muffler
Unscrew and pull off the exhaust endpiece. Remove oil-
carbon deposits from the inside of the muffler using a
scraper. Also carefully remove the oil deposits from the
exhaust baffle and the exhaust endpiece. Replace the gasket
if necessary.
NOTE: For further break-down of exhaust system refer to
diagram.
MAXI. MAXI LUXE
NEWPORT II. MAXI SPORT MK II
II
M A G N U M II
M A G N U M M K I I
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