Triumph SPEED TWIN 1945 Workshop Instruction Manual page 26

t o be pbised o n ;he open road by a lightweight, b u t the r ~ d e r o f a new model must
control his impulses, happy In the thought that the treatment he is giving his engine
w i l l mean considerably improved performance at t h e end o f the running-in period.
W h e n a machine is intelligently and carefully run-in, it w i l l be faster, mechanically
quieter, and
will
wear longer than t h e mount of a r i d e r who pays n o attention t o
t h e tiner points o f running-in.
With
a new machine, speed, w i t h i n reason, does
1
n o t greatly come i n t o the question; t h e main idea t o keep i n one's mind is that t h e
engine must never be stressed. By far t h e best ind~cation i s the amount of t h r o t t l e
opening, and during t h e initial stages m o r e than about a quarter t h r o t t l e should n o t
be used.
I
T h e engine must n o t be allowed t o slog i n the higher gear ratios; it i s far better t o
change down t o a lower gear when the engine w i l l be revving faster, b u t much more
easily.
It
is a g w d plan t o put a little spot of white paint o n the twistgrip rubber
and a spot of black paint o n the chromium plated twistgrip body, i n such a position
that these coincide when the throttle is closed.
It
i s then easy t o estimate the t h r o t t l e
opening during t h e running-in period and the "spots" can be easily removed. o r the
position of the w h i t e one altered.
A f t e r about
250
miles have been covered, t h e t h r o t t l e opening can be increased t o
say a third, and this means that the speed w i l l gradually increase. A further amount
o f t h r o t t l e can be used as the running-in progresses, until the full t h r o t t l e opening
has been worked u p t o at about
1,200
miles.
Following the principle throughout that the engine must never be unduly stressed,
speed bursts w i i l be carried out progressively. W i t h experience it may be found
that
a t
a certain t h r o t t l e opening the machine w i l l easily reach 50 miles per haur.
W h e n the speedometer needle touches that speed f o r the
f i r s t
time, the engine
should immediately be throttled down. After
a
period of slower running, the
50 m.p.h. mark can be worked up t o again, and this time held f o r a little longer.
By gradually w o r k i n g up i n this way, the time w i l l come when the first of a few miles
at 50 m.p.h. has been arrived
a t
progressively. The same care should be taken when
higher speeds are reached. W i t h the higher performance machines i n t h c Triumph
range, similar care should be taken t o see that the maximum speed
i s
worked u p t o
very carefully and
is
only held for a very short period initially. A t really high speeds
it
i s advantageous t o close the throttle momentarily
a t
regular intervals, as this
enables an increased amount of o i l t o pass up the cylinder bore.
W h e n the engine
i s thoroughly run-in this precaution is, of course, unnecessary.
During the running-in period great care must be taken t o follow the lubrication
instructions which w i i l be found on page
31.
Lastly, do not forget that you will have plenty of t i m e t o t r y the paces o f your new
mount during the many thousands of miles you w i l l cover after the running-in period
has been completed. Never be tempted t o "see what she w i l l do" i n the early
stages, and do not be persuaded by your friends t o test the speed of t h e machine
against theirs until you are quite satisfied that your engine
is
thoroughly run-in.