The light weight 2 stroke engine, a 3
cylinder "Triple" model pictured here. This image is of the
front of the engine where this models exhaust exits. The
water pump is visible on the lower left behind the "right
front" motor mount. On the right of the photo is the
crankshaft PTO output where the "primary" or "drive" clutch
is normally installed. On the opposite end is the "recoil"
or "pull start" housing.
crankshaft that goes around and around and similarly to a
bicycle pedal crank, in which also the pedals are pumped up
So instead of
pedals being pumped up and down like on a bicycle,
combustion "pumps" the pistons up and down which in turn
spins the crankshaft.
This is the variable
speed clutches, the smaller diameter "primary" or "drive"
mounted on the engine crankshaft. And the larger diameter
"secondary" or "driven" clutch. The fit, deflection and
width of the drive belt is absolutely critical to proper
is the die cast balanced and
matched primary assembly.
is the protruding 3 arm spider with roller against
calibrated weight, restrained at idle by the drive spring.
Photo 3 shows the drive
clutch exposing the drive sheaves on which the belt is
is the driven clutch helix and driven spring. You can see
where the bushings move on the shaft, when the clutches
shift in unison and the sheaves open for higher speed.
It is the variable speed
snowmobile clutches working in tandem that provide the
smooth and proper range of RPM that enables the 2-stroke
engine to perform its best at the engines power peak.
Where the "rubber meets the road"
as the old saying goes. This is a "121 inch long"
that is 15 inches
wide with 1 inch treads adequate for a 90HP sled that can
run on a groomed trail with out worry of over heating
suspension and drive components.
Also visible is the
extruded aluminum heat exchangers mounted under the running
boards. Not only are the heat exchangers part of what makes
these chassis so tough, but these heat exchangers permit the
liquid cooled snowmobile engines to run at a low stable
temperature contusive to making twice the staying power of
comparably sized air cooled models.
skis and aggressive
(pictured) round out a good handing package. Like riding on
rails this tough NASCAR like snowmobiles go where you point
them. A skid plate adds integrity to the plastic belly pan
and protects the chassis from some of the obstacles hidden
in the snow.
The plastic "sliders"
or "hyfax" is red and visible thru the open windows created
in the track for lubrication and cooling.