Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/84166
Transmissioned Snowmobile 1010rc,(le Drag Racer > ~ !r III N l " .... '" N co > :; ..., (J) 3: w z W ...J U ~ U 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. C"I'1PL.r£ C'«FPtlItI 6£~tJW.AN/) 8AIN~ rtf) r~ CYC~E H"(,I.!1E .. 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 OveraII 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 .., ce',