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  1. Vintage Ski Doo's
    Hello to everyone, first time posting for me and just made an account to post. I just bought a 292 or 340 motor to hopefully build a little bush whacking elan or to make my 66 a bit more fun on the trails. I was told it was a 340 from a 1969 320ss but once getting it home and looking it...
  2. Vintage Ski Doo's
    Hey everyone, hoping I can get some tips and advice on replacing my throttle cables in my 1987 Ski Doo Tundra 250 Single. I am new to the snowmobile world. I have ordered a replacement throttle kit but having never done any of this before I am looking for any advice I can get. Is it hard to...
  3. Vintage Ski Doo's
    I have a 1973 250 single cylinder elan. It starts fine in the warm weather -like in September - but hard to get going once the weather turns cold. When I try to start it, it wants to go, but it seems to be sending too much gas to the cylinder and flooding the spark plug. Sometimes it gets...
  4. Vintage Ski Doo's
    Hi, I just bought a 1995 Tundra II LT to rebuild. It was seized and taken apart...engine in box...Piston has .50 on the crown....Is this first oversize ? What brand piston do you guys recommend ? Rotax are quite pricey. Also the needle bearing on the small engine came right...
  5. 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...
  6. Vintage Ski Doo's
    What Cranking Compression should I be seeing on these old 335 Singles? Is there a Spark Plug Adapter for these Big Old Style Plugs? Finally got the Clutch off. Is there parts to rebuild these Old Clutch's? Does anyone make a Tuned Pipe for the 335, and if so, about how much are they? Bad...
  7. 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
  8. 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...
  9. Vintage Classifieds
    Wanted complete Skidoo 335/340 Single to rebuild. Would prefer a CDI version. Thanks Rich
  10. Vintage Ski Doo's
    Looking for Drawings, or 3D CAD Model of a 277 Crank, Case, Cylinder, Head. Rich
  11. HP?

    Vintage Ski Doo's
    What was the highest HP Production Single ever made? What was the Bore & Stroke? 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. 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...
  15. 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...
  16. Vintage Ski Doo's
    Just taking a quick survey of how many single-cylinder racers would be interested in crossing back-and-forth over the border to race during the upcoming season. With several races held in Ontario and Quebec each year, would like to see how many from Northern NY would make the trip to this side...
  17. Sledding - General Discussion
    I Need some Skidoo/Rotax 250, 277, 292, 299, 300, 335, 340 Single Cylinder/Head/Rod Info. Head Bolt Patterns What Rods ARE used Any CAD Files, Head, Cylinder, Block Crank Swap Info Head Swap Info Block Swap Info A Rotax 277UL(72mm x 66mm) 120mm Rod, 11.8:1 Compression, 26hp at 6250rpms...
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