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  1. Vintage Classifieds
    Looking for the Free Air Housing/Rope Pull Parts for the Skidoo Singles. I have a 1972 335 from an Olympique. Rich
  2. Vintage Ski Doo's
    anyone done a stroker crank on a 503 rotax using sections from 277 cranks? i understand that they have longer strokes than the 503s. also i read somewhere that someone made a big bore 81mmX61mm twin. could that be done with a stroked 503 to make a 721 big bore stroker? thanks in advance
  3. Vintage Ski Doo's
    Here is all the info you need to make a Tuned Pipe. Please Post your Vintage Engine Spec's. Some better Tuned Pipe programs ask for the Exhaust Port Angle. Please use this Format for Example. Year: 1983 Model: 277UL Bore & Stroke: (72mm x 66mm) 268.7cc CR: Theoretical 11.8, effective 6.7...
  4. Vintage Ski Doo's
    Can someone confirm for me, does all Skidoo from 70s, 80s, Singles, with Bosch Points Ignitions, 247/250, 277, 292, 299/300, 318/320, 335/340, use the same Flywheel? I have a 1981 277 Crank that originally had a Bosch Ignition, and need the flywheel. Does anyone have the Part Number? Thanks Rich
  5. Sledding - General Discussion
    What is the proper way to Balance a Single/Twin Crank? Older 80s/90s Skidoo/Rotax's viberate a lot! Who can do this? Rich
  6. Vintage Ski Doo's
    Has anyone use a 670 PTO and MAG ends of the Crank to make a Custom 70mm Stroke Crank for a Single? If so, which Single Case did you use? Has anyone used either a 583(64mm), 617(68mm) PTO and MAG ends of the Cranks to make a Custom 64mm or 68mm Stroke Crank for a Single? Which Case did you...
  7. Vintage Ski Doo's
    Which Stock Skidoo Single made the most HP, and at what Rpms? 277 makes 25.4hp at 6000rpms with a 11.8cr -------------------------------------------------------------------------------------------------------- I have heard of a (84mm x 66mm) 365.9cc Single made for Racing by Skidoo. Does...
  8. Vintage Ski Doo's
    I have been thinking of putting a 277 in a bubble nose for years. I now have a pretty rough Citation with a running 277. I see a guy put one in a Elan. Are there major issues other than the exhaust that I would have to worry about? Anyone have a link to a build with a modern engine in a...
  9. Vintage Ski Doo's
    Are any of the Singles Case halfs inter changeable with a 277? Can you put 292(75mm), 299(76mm), 340(78mm), Cylinders on a 277 Case? Can a 277 Crank be put into a 292, 299, 320, 340, Case?
  10. Vintage Ski Doo's
    Looking for Drawings, or 3D CAD Model of a 277 Crank, Case, Cylinder, Head. Rich
  11. Vintage Ski Doo's
    Looking for Stock, and Aftermarket Race Parts, 3D Model CAD files of older 70, 80, 90s Skidoo/Rotax engines. Blocks, Cranks, Rods, Heads, RV Covers, etc. Thanks Rich
  12. Vintage Ski Doo's
    #1 Does anyone have a list of all of the Skidoo Single Engines, with Bore & Stroke & Year made, or know a web site with the info? #2 Does any one have the Part Numbers for the 1983+ Skidoo 277 Nippon CDI Setup? Flywheel Stator Plate Coil etc. #3 Does anyone have a 277 Nippon CDI Flywheel, for...
  13. Vintage Ski Doo's
    I have a 277(72mm x 66mm) Single that had a Bosch Points Ignition. I want CDI, so what is my Options? My 277 Crank Mag End Taper is 23.65mm (0.931") on the Big End, 20.96mm (0.825") on the Small End, 23.59mm (0.928") Long. The Bigger Mag End Taper on say a 377 - 617 is: 27.8mm (1.101") on the...
  14. Sledding - General Discussion
    Does anyone make any pre 2000 Billet Skidoo blocks, cranks, RV Covers, heads, today? Here is a Yamaha two Cylinder Block. Rich
  15. Sledding - General Discussion
    Who makes aftermarket flywheels? Jetnetics, used to make Seadoo flywheels, but I think there out of business. Anybody, make any flywheel adapters? Rich
  16. Sledding - General Discussion
    If you have an Old School Engine Build, or Big Bore, please post it. The more radical the better. If you have part numbers, and photo's, dyno sheets, that would be great. Pre 2000 motors only. Thanks Rich
  17. Vintage Ski Doo's
    I have a 1981 277 that I'm looking for a Nippon Desno CDI Flywheel. I found these part numbers below that may work. If you have any of these parts, or other part numbers, please post, or send some photo's of them. Thanks. Rich (277) 410-9148-00 Magneto Flywheel Flywheel Ski-Doo Formula Plus...
  18. Vintage Ski Doo's
    Does anyone still make a Stock, or a Billet Crank still, for the Skidoo 277(72mm x 66mm) single cylinder engine? Has anyone ever Adapted a Skidoo 335/340 70mm Stroke Crank for a 277 Case? Does anyone have a CAD/PDF/Paper drawing of the Skidoo 277 Crank, Engine Case, etc? My 277 seems to be a...
  19. Sledding - General Discussion
    Does anyone still make a Stock, or a Billet Crank still, for the Skidoo 277(72mm x 66mm) single cylinder engine? Has anyone ever Adapted a Skidoo 335/340 70mm Stroke Crank for a 277 Case? Does anyone have a CAD/PDF/Paper drawing of the Skidoo 277 Crank, Engine Case, etc? My 277 seems to be a...
  20. Sledding - General Discussion
    Anyone have any CAD files for any stock Heads, Cylinders, Blocks, Cranks, Billet Race Heads, Head Inserts/Domes, for the older 80/90s engines? Mainly interested in the 277, 292, 299, 377, 380, 470, 503, 521, 583, 617, 670, engines. Rich
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