Indeed, with a brake and extremely rare.
Mark
Mark
My understanding of the BP snowmobile engines was that they were being developed for snowmobile ice racing and they were on par for performance of anything in the same cc range at the time. Problem lies with the rules since it used a balanced piston they had to include that in the engine size. So a 399 cc engine was competing against 500cc engines. The project was eventually pulled and these engines were known as ghost motors till around 2005. There is one in the racing snowmobile museum in a sled that was being used in the day.Emissions weren't a big concern then. Problem was in early '70s the sled industry peaked at well over 100 manufacturers. You had to make a sled that performed, was reliable and innovative to succeed. Bob Mcculloch was no doubt a genius, but think he was too late. If you put that sled I posted up against a Yamaha, Arctic Cat, Scorpion, Rupp, Skiroule, etc of the same year you see how far behind he was already starting. Snowmobilers are some of the most brand loyal people there are, it takes quite a machine to make them leave their preferred brand.
By the mid '70s most manufacturers were gone and you were down to a dozen or so that included the 4 that exist today.
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