Using the 1977 SRX engine base andĬrankshaft with different cylinders that featured less aggressive port timing, Than what was needed for oval sprint racing. The new 440 engine was engineered to run longer An advertisement for the 1980 Yamaha SRX. Full instrumentation was provided and a 7-gallon gas tank was fitted, as was a short windshield. The seat looked the same, but was actually a new design. Steel cleats were deleted from the molded rubber track. Engine cooling was accomplished with the same system of a small radiator and heat exchangers, but the tunnel-mounted exchangers were lengthened for increased cooling capacity. Numerous components were strengthened – including the jackshaft, the driveshaft and the skid frame (which was beefed up with more travel). Positioned as a lake runner, the first liquid-cooled Yamaha trail sled retained the basic appearance of the earlier stock racers, but in many details it was a different machine. In 1978, the SRX became a trail model available to anyone who wanted to purchase one. In addition, factory driver/ engineer Morio Ito and his mechanic Tom Marks used an SRX as their test mule for coil-over-shock suspension development for the forthcoming SSR oval racer.
Onge and numerous others went on to compile an enviable competition record with the ’76 and ’77 SRX racers. “Fast Eddie,” Bobby Donahue, Dick Trickle, Bob Hulsebus, Oscar St. Built to go fast and turn left until there was no more hundred-plus octane aviation gas remaining in the tiny 2.6-gallon fuel tank, the sleds had aluminum skis, a tachometer (a speedometer was optional), no windshield and only a pretense of trail-ability.Įd Schubitzke electrified the snowmobile world by winning the 1976 Eagle River World Championship on a slightly modified SRX – a truly incredible performance for a stock snowmobile that would run with the best of the modified race sleds from the other brands. It returned in 1976 and ’77 for Yamaha’s race-ready oval sprint sleds that were offered in limited numbers to qualified independents for the “Stock” class competition of the time. The SRX designation was not used in 1975. They weren’t big winners or the most publicized Sno Pro sleds and most snowmobilers never even saw one. The first Yamaha to carry the SRX model designation was the company’s 1974 Sno Pro racer, with very few units handcrafted for the fledgling professional racing circuit.
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