My '71 features a 400cc CCW engine, while my Ski-Doo has a 399cc Rotax-Bombardier engine. Both have single Tillotson carbs. My friend Russell ran a '72 Chaparral Firebird 400, a '73 Boa-Ski Mark II 292 (Kohler Axial Fan.) and a '98 Ski-Doo MXZ 670 in the 601-700 class.
We were placed in the 0-500 class with our old stuff. I took the first two wins with my two sleds, then in the second round, I had to run both of my sleds against each other! Russell ran my Ski-Doo, while I rode my Scorpion. He beat me because the 'ol Stinger fouled a plug at the line and had to limp down the track on one cylinder. I finally got my Ski-Doo beaten by a '98 Ski-Doo Formula 500.
Not too shabby at all though since I was running against sleds 27-years
newer than mine! I highly reccomend grass-racing, especially with an older
sled, you'll have a blast I guarantee, I did!
Comments, questions, email Marc