If the chain is too slack it is apt to " whip, " which intensifies the wear and tends to
break the rollers. If on the other hand it is too tight, a crushing effect is produced on the
rollers, and the whole chain is strained unduly.
The chain should he adjusted and kept adjusted, so that it can be pressed down in
the centre with the finger about ¾ in.
CARBURETTOR
The Carburettor fitted as standard to the Camshaft Models is an Amal. There are
four ways in which the quality of the mixture can be varied, these are as follows :
1.
2.
3.
4.
Alteration of Main Jet size (P) to adjust setting from ¾ to full throttle.
Needle position (C) in Throttle Valve ¼ to ¾ Throttle.
Throttle Valve cut-away on the air intake side (H) ¼ in. to ¾ in. Throttle (num-
bered on top of slide showing variation).
Pilot air adjustment (L) closed to
8
Throttle.
—14—
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