Chassis Improvementsįor 1976, the Nitro’s entire front end was overhauled. “The Nitro at 80.8 decibels was the second loudest sled tested,” editors wrote. This required a ir to pass through the hood and out the cowl below the handlebars, bringing noise level with it.
Instead of taking advantage of a separat e heat exchanger and the relatively sealed engine room that becomes possible, the Nitro used a radiator core in the console. Unlike the liquid –cooling systems found on the ’76 Massey Cyclone and John Deere Liquifire, Rupp used an automotive-type radiator for lowering coolant temperatures without depending on snow conditions. “This design allows for improved weight distribution, lower center of gravity and better transfer to the clutch,” editors wrote.
SLIDE RUNNER JOHN DEERE CYCLONE 440 PLUS
Rupp signed an agreement with Arctic Cat to use Cat’s roller ramp drive clutch, plus its driven clutch and the same cross -sled jack shaft, complete with aluminum chaincase equipped with self-adjusting chain tensioners. In Snow Goer speed tests, the sled accomplished a standout 80 mph in the 1/4-mile speed trial, best of all the 26 test sleds in any category – new models, high performance or most popular, according to editors. “īut Rupp buyers were sledders with perfo rmance foremost in mind, and the ’76 Nitro delivered just that. 3 MPG, a step above most 76 sleds delivering comparable performance. “In Snow Goer economy runs ,” they wrote , “the Nitro managed 13. ĭesp ite the 38mm carbs, the Nitro got good gas mileage for its time, according to Snow Goer editors. All it required was a screwdriver to change the carbs to the proper setting.
This allowed riders to tune for variances in either altitude or temperature without disassembling the carbs to change the main jet. The new Xenoah engine carried dual38mm Mukuni carbs with adjustable main jets, calibrated at 1 ,000 to 2,000 feet. The roots of the Nitro engine stemmed from that design, but with two additional years of R&D. In its last season of production, Chaparral introduced a 1974 liquid-cooled, high-performance sled called the SSX in 340 and 440 versions. Xenoah was then the parent company of Fuji Heavy Industries, which had formerly supplied Chaparral engines before it pulled out of the snowmobile business. The 1976 Nitro engines for the first time were built to Rupp’s specs by the Japanese firm, Xenoah. As a result, the same engineering that showed up in seven Rupp sleds for ’76 were available under the Alouette banner north of the border. In ’76 Rupp purchased Alouette, a Canadian snowmobile manufacturer. “Available only with liquid-cooling in 440 and 340 engine sizes, the new Nitro boasts even more hot throttle response, even lower noise level and even greater turnability,” editors wrote.
SLIDE RUNNER JOHN DEERE CYCLONE 440 FREE
The new hybrid, carrying the Nitro name, reserved for Rupp’s top –of-the-line trail sled, more than sufficiently replaced the free –air ’75 Nitro, according to Snow Goer editors. The sled was a successful result of mating Rupp’s proven suspension and chassis to a liquid-cooled engine package from Xenoah, powering the trusty Arctic Cat El Tigre torque convertor clutch system. Rupp Industries jumped into the liquid-cooled fray in 1976 w ith its speedy Nitro 440. Like today, high performance buffs wanted the latest, quickest, most modern sled, and many turned to machines with liquid-cooled mills for that fi x. The added cost and weight, among other factors, previously kept liquid-cooled engines absent from economy or family-based sled.īut liquid-cooling offered a su itable alternative to fan-cooled and free-air engines in high-horsepower snowmobiles where price was not usually a big factor in the buying decision. Theres also the obvious things like check to make sure your belt is in good shape, bopies are well lubed and working properly, and that there arent any mouse nests in there.The high-performance trail class of snowmobiles saw an increase of liquid-cooled sled for the 1976 model year. Really easy to put on, and it made a world of difference on my old Ski Doo TNT 640. There pieces of steel or some other metal that extend your ski stance by about 4 inches. If you are planning on doing a lot of riding on this sled and want to help the handling a bit, you might want to try adding some ski spreaders. I guess its possible, but I want say it will be something more along the lines of 45. Not impossible, I just got one for my 1972 Elan I also dont know about 55mph top speed. I agree with trikes4life though in that its hard to find tracks for those machines. While you get more riding out of a quad than a sled, you say your quad is beat and that sled is really nice.
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