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  1. General Discussion
    Hi fellas !! I’m posting this here since my question doesn’t relates entirely within any models specific forum sections. My question is : except for the turbocharger and cams "my guess is it’s the same head/ports but turbo specs cams in the turbo version" what’s the differences internally ...
  2. Vintage Ski Doo's
    Hey I am in the process of rebuilding my Rotax 294 twin and I have a question about the distance ring on the crankshaft. This ring slides over the crankshaft and has the seal slid overtop it. Am I supposed to use any retaining compound to secure the distance ring to the crank? I don't want any...
  3. Vintage Ski Doo's
    Hey all, hope you are all enjoying any snow you have for some riding! I had a question about the motors in the MX and Formula plus and I'm hoping you can help. When I was a kid, I had an 88' Formula Plus with a 521 rotax motor. The seat and the hood had black and white striping. Not sure what...
  4. Vintage Ski Doo's
    Wondering how you all would go about cleaning and refinishing this engine? Has good compression, and was running until parked (long time ago) - Is it worth pulling the whole casing off to clean and service the fan? And what sort of products do you all like to use? I'd like to refinish the...
  5. Vintage Ski Doo's
    Hey guys. I have a 87 Skidoo Safari it was my uncles and he passed and now I am restoring it and have been for 2 years now. I've finally almost got it done and I have extra connectors and no clue where they go. Anyone have any ideas. I have pictures of the connectors but I don't believe I can...
  6. MXZ / Legend / Summit / Grand Touring / Formula
    Having trouble finding the year this 670 Rotax is. Has a bar code ID on it and the recoil is on the outside, so it's 95+. I'm thinking this is out of a 96 MXZ 670, can anyone confirm? Just the engine, this rotax was swapped into another chassis. There is a D stamped on the head. The bar...
  7. Vintage Ski Doo's
    I have an '81 Everest 503 with a single Mikuni carb that won't stay idling, it dies after about 10 seconds if I don't give it a partial primer pump or put my fingers over the carb throat. Dies from being too lean. Holding palm over carb throat or giving it a pump of the primer it starts right...
  8. MXZ / Legend / Summit / Grand Touring / Formula
    As far as I know my sled is a 99 I've had people who specialize in skidoo tell me it's a 99 but seems there's alot of people who get bent out of shape over me saying it's a 99. Help please did the 99s exist or didn't they I'm annoyed at this argument haha from what I've been told they were made...
  9. Wanted To Buy
    Currently trying to find a primary exhaust for my sled but have been having a hard time. All the parts people I've reached out to have nothing and the ones I've seen on ebay or kijiji just seem to be asking an arm and a leg. Is there somewhere that makes these for a decent price? Or better yet...
  10. Wanted To Buy
    Looking for a main exhaust pipe for a 1999 MXZ 700. Unfortunately the original pipe rotted out
  11. MXZ / Legend / Summit / Grand Touring / Formula
    Hello riders, I just bought a '98 Summit X 670 and I'm in the process of bring it back to climb mountains. I came from a Nordic 50 from which I asked and obtained even too much :), ever tried climb a mountain on fresh snow with a similar sled? lots of fun.... and blasphemy :lol: It looked...
  12. Vintage Classifieds
    I will be at the A-1 swap meet in Chesaning Mi Friday Nov 2 with Two Rotax 503 engines/parts. I interested call me @ 810-423-2826 Regards, Mike
  13. Vintage Ski Doo's
    I have a 1993 Alpine II with an engine that needs some work. The 503 Rotax engine number is 3897749 and it might not be original to my machine - I need to find out what year the engine is so I can get the right stator for it. There are quite a few for the early 90's. SkiDoo was of no help to...
  14. MXZ / Legend / Summit / Grand Touring / Formula
    I'm new and interested in what people have to say and am wilLing to listen. I have had a 1999 MXZ 500 with the 494 L/C Rotax engine and am having a problem with getting if to fire off. I have cleaned the carbs which were not bad and took apart the exhaust valves and cleaned the carbon off of...
  15. MXZ / Legend / Summit / Grand Touring / Formula
    hey guys. i just bought a 95 skidoo formula with a 99 rotax 670 h.o. right now its only running on one cylinder. i took the fuel line of from the pump to my "dead carb" because i can visibly see the fuel stuck not getting through. The fuel kept leaking out of the pump leading me to believe its...
  16. Vintage Ski Doo's
    What I am wondering is has anyone done a R.A.V.E. Valve mod on a 503 Rotax? Has it been done? I know that anything can potentially be done if you have the time, money, and resources, but that's not what I'm wondering. I'm already going to do a reed valve induction modification, and considering a...
  17. Vintage Ski Doo's
    can you bore 371 rotax jugs (62mm) to accept 399 rotax pistons (64.5mm)? the 371 twin is NOT an opposed motor.
  18. Vintage Ski Doo's
    ive got an old 640 alpine motor i wanna get running. tons of compression and its got spark. i dont have a tillitson or mikuni, but u have a walbro wf style carb. anyone know what i should set the adjustment screws at? thanks.
  19. Vintage Ski Doo's
    Hey just want to get some opinions on this. I have an older 8x8 Argo ATV that I have rebuilt with all HD parts and chain. I love the classics and the classics had 2 strokers in em' so that's what I'm going for this time around too, just none of the "kohler" nonsense!! :laugh_old: (Argos used...
  20. Vintage Ski Doo's
    Hi, Just put a seal kit in my 74 Elan 247, and swapped cases with another 247 which is the E model. So I swapped my fan and magnet out for the fan and magnet from the 247E. The E model had the exact same magnet but the fan was bigger to accommodate the huge ring gear for the electric start...
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