Triumph Spitfire MK3, Handbook

Page: 66 / 81

RUNNING ADJUSTMENTS
65
When the mixture is correct the exhaust note should be
regular and even. If it is irregular with a splashy type of misfire
and with a colourless exhaust, the mixture is too weak. If there is
a rhythmical type of misfire in the exhaust beat together with a
blackish exhaust the mixture is too rich.
Jet and Throttle interconnection adjustment
(Figs. 104 and 105)
With the choke control fully "IN", the engine warm and
idling on a closed throttle, adjust the screw (5) to give a clearance
of 0.0l5" (0.4 mm.) between the end of the screw and rocker
lever.
Always check this adjustment when the throttle stop screw
(1) is altered.
Cleaning Suction Chamber and Piston
At approximate intervals of twelve months, detach the piston
unit. Clean the piston and the inside bore of the suction
chamber. Re-assemble dry except for a few spots of thin oil on
the piston rod.
Replenish the damper reservoir.
Cleaning Float Chambers
Periodically remove the fuel feed pipe, float chamber lid, and
float assembly, from each carburettor. Remove all sediment
from the float chambers and re-assemble the carburettors.