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To decarbonise the port it is necmsary to detach
the exhaust pipe and silencer.
The former is held
on its flange, with a special jointing washer A, by
the two nuts B, Fig. 10. and the silencer body is
supported by a slotted strap, attached by nut C.
The complete exhaust system can be lifted clear
when the nub B are unscrewed, and nut C is
Slackened'
To remove the carbon from the exhaust port,
turn the engine until the piston is at the bottom of
its stroke.
This can be seen by looking thmugh
the port and noting that in this position the piston
has just completely uncovered it.
Now take an
Fig. 11.
Head 011 piston at t.d.c.
old penkniie or similar tool and carefully scrape
away the carbon in the port.
Then wipe it round
with a piece of rag and turn your attention to the
exhaust pipe.
Any appreciable amount of carbon.
which has accumulated in the pipe will be at its
entry, and it can easily be scraped out.
Silencer.
"'hilc the exhaust system is detached from the
cylinder it is advisable also to dismantle the silencer
by removing nut D. together with. its washer. and
?.G
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