Features:
Torque
Induction engine The ail-new TY175C utilizes a single 2-stroke aluminium engine with Torque Induction to
increase the intake efficiency and yield more available torque over the lower
and middle speed ranges. This outstanding performance is attained through the
use of the transfer ports in the cylinder well. the addition of a seventh port which
compresses a small quantity of fresh fuel on the intake stroke to be used for
completely purging the combustion chamber of burned gases and a 4 petal
reed-value assembly which supplies fuel to the engine on demand.
Autolube
YAMAHA developed
the Autolube system which automatically supplies oil from a separate tankto be mixed
with the gasoline. This is accomplished by precisely and continuously
monitoring the engine speed and throttle opening so that only the exact amount
of oil for optimum engine performance will be added. This system was developed
in order to end the messy need for manually mixing the gasoline and oil, and as
an extra benefit engine life is greatly Lengthened because the engine is always
operating at optimum efficiency.
Transmission
Utilizing a
6-speed transmission the TY175C is ready to encounter the most varied trials
section. The lower gears are designed for really slow going with smooth pulling
power and a comfortable overlap between gears so that the power flow will be
continuous. The higher range of gears allows the machine to be easily ridden on
the roads In between the sections without straining the engine. Also, all gears
have been precision constructed using specially-hardened tool steel for maximum
durability and minimum back-lash when the machine is suddenly accelerated.
Flywheel and
magneto mass
For the most
part on trials sections, the Operating speed of a trials machine is very slow, and
slow walking speeds are not uncommon. Generally, sow—speed operation is
hampered by the pulsing forces of
the piston which is operating just above its stall speed. but with the TY‘l75C.
this problem has been eliminated with the use of a heavier mass flywheel and
magneto. The inertial force of the rotating mass compensates for engine pulsing
and yields a smooth performance without appreciably
decreasing throttle response.
Carburettor
quick change lever
For optimum
low-speed high-torque operation through a trials section. the engine should be
operated with a leaner fuel mixture. however, to obtain the best performance at
higher speeds, such as on
the roads in between the Sections, a normal-rich mixture is recommended. To
eliminate time consuming, troublesome adjustments, the TY175C is equipped with
a quick-change lever on the carburettor so that. with a simple flick of the
finger the fuel mixture can be quickly changed for either section or road
riding.
Frame
In order to
assure that the TY175C will be able to withstand the severe treatment
encountered on the roughest section. the frame design is a double-cradle type.
This frame. with its high tensile-strength, tubular-steel construction, is
based on the frames of the famous YAMAHA Motocross and Road Racer machines
which have been consistent championship winners on leading tracks throughout
the world. The double-cradle frame has become well-known among experienced motorcycle
riders as e frame which can withstand the stresses, strains and shocks of competition
riding and come out on top.
Front forks
The new TYi75C
is equipped with hydraulically-damped, inner-spring front forks. These from
forks have been selected after studying the data accumulated from some of the most
formidable race tracks around the world in order to assure that the TY175C has
forks with lasting performance and durability.
Among the criteria searched for are those which offer machine stability without
impairing manoeuvrability and as a result, the TY175C is able to cushion larger
road shocks and maintain e more uniform performance attitude.
Chain tensioner
When riding
through a trials section, precise control of the throttle and brakes are
essential to prevent footing and the machine should be able to respond quickly
and smoothly. In order to prevent the chain from back-lashing when suddenly
accelerating, a spring-loaded chain tensioner is attached to the rear swing-arm.
This tensioner maintains a constant pressure on the chain at all times to
remove any slack which may occur, and in this way eliminates the cause of
back-lashing.
Brakes
The TY175C has
been designed from the ground up to be a top contender at trials events. In obtaining
this ideal design, all types of terrain must be considered, therefore, the
brakes have a special labyrinth seal that prevents water and dust from entering
the drum and affecting the brake performance. Also the brakes have a large heat
dissipating capability to assure that the brakes will not fade
even under repeated hard use.
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