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Transmissioned Snowmobile 1010rc,(le Drag Racer
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Although this picture doesn't show the size of these carburetors very well, the venturi size is just
50mm. What the rig really is, is a carb~injection system. (Not really but close enough,) As you can
see, the butterfly valves are connected in the middle by a bar with a screw arrangement. This
makes for a very accurate method of synching the carbs. The strange flat protrusions at the
bottom aren't the usual floats. In fact these things don't have any float. h is actually a very
simple fuel pump. In the middle of the venturi, there is a smaller venturi. This causes the fuel to
be sucked out into the air stream. All jetting is eliminated by the use of a screw-in jetting system.
These have proved to be the hot set up.
As can be seen in this picture, the front brake is operated in the usual manner. The brake and the
whole front end are from a Yamaha 80. The front rubber is a 2.00 Dunlop road racing tire. The
rim comes from the Akront company. The left front lever activates the rear brake. This is one of
the only left hand hydraulic brake units in the world, The rim around the tire is to cheat the
timing lights. The quicker the lights are opened the quicker the timer starts, While this may mean
only ,03 seconds, th is can mean a race or even a national record. The fuel tank holds about two
quarts.
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The reason the carbs work so well is the pump system. Nothing a'Hects it but temperatures that
freeze gas. The black rubber pad with the holes in it controls the fuel flow. It regulates the
amount of gas or fuel that can reach the pump. The pump itself is the other black rubber disc.
The pump is activated by the crankcase compression. This is a verysimpJeand highly efficient
method of fuel metering.
The results of all the parts put together is this. Roger Davis rides the beast. Just think, this is
Bowers' first attempt at a racing motorcycle. The next one, in the building stages now, will be for
the twilight zone.
Motor
Classification
Horsepower
Top Time
Top Speed
Wheel Base
Overa II Length
Total Weight
Transmission
Clutch
Drive line
Carburetion
Fuel Capacity
Brakes
Front
Rear
Yamaha 643cc two-stroke Alternate firing twin
_
Legal NHRA D-gas
_
Gas-1oo
_
_
10.009 seconds/quarter mile
135.00 mph
:
68"
_•.............96"
1861bs.
none
none
Snowmobile Torque Converter-than chain from jackshaft.
'"
2-50mm-Keih in
2 quarts
:
Yamaha 80
Kelsey Hayes disc
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