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To decarbonise the port it is necessa.ry to detach
the exhaust pipe and silencer.
The íomer is held
on its flange, with a special jointing washer J4, by
the two nuts B, Fig. lO, a,nd the silencer body is
supported by a slotted strap, attached by nut C.
The complete exhaust system can be lifted clea.r
when the nuts B are unscrewed, and nut C is
slackened.
To remove the carbon írom the exhaust port,
tum the engine until the piston is at the bottom of
its stroke.
This can be seen by looking through
the port and noting that in this position the piston
has just completely uncove.red it.
Now take an
Fig. l1.
Head off piston at t.d.c.
old penknife or simila.r tool a.nd ca,refully scra.pe
away the ca,rbon in the port.
Then wipe it round
with a piece of ra.g and tum your attention to the
exhaust pipe.
Any apprecia.ble amount. of carbon
which has accumulated in the pipe will be at its
entry, and it can easily be scra.ped out.
Silencer.
While the exha.ust system is detached from the
cylinder it is advisable also to dismar\tle the silencer
by removirig nut D, together with its wa,sher, a.nd
26
(
lifting the lid, noting ca,reíul]y that a special joint
washer E is interposed between the silencer and
the lid. Take care not to damage this, a,s it is liable
to affect the exhaust note a,dversely if repla.ced in aI]
ur]sourid condition.
The internal baffle F can now be taken out and
this, together with the inner walls of the silencer,
should be carefully cleaned of any carbon which
ha.s íormed, after which the sileI]cer can be re-
assembled.
An absorption type cylinder of improved design
is fitted to later models.
The sound absorption pack (C), Fig. llA, wiu
eventually become choked, and shou]d be replaced
by a new one at intervals of aDout 5,000 miles.
To
replace this pa.ck, remove silencer a.s described on
page 26, then take oÍÏ nut J4, Fig. llA; this allows
the rear end o£ the silencer body (D) to be separated
Írom the front end (Í?)., when the old absorption
material can be pulled out.
Fig. lIA.
Clean the perforated tube of any carbon or oil,
fit the new pack (obtainab]e from your Winged
Wheel dealer) and reassemble.
Remove any carbon
deposit which may have collected in the small
flanged inlet pipe before refitting silencer.
27
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