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  1. Vintage Ski Doo's
    Hello, I have a tundra 300 1998, but I just bought a safari cheyenne 503r lt 1990, and I was wondering what was the top speed of this machine, and if it goes well in powder. Also, I was wondering if there are some cheap modifications I could do on it to make it even better in powder.
  2. 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...
  3. Vintage Ski Doo's
    Hello, I love the forum, old Doos and looking for some advice. I have three Cheyenne 503s and I have to choose one to be my main sled, and I'll be selling one. They're all basically the same, but the main difference is the '91 has an updated gearbox and some weird extra brake lever thing that...
  4. 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
  5. Skandic / Expedition
    I'm looking for using a 1994´s 503 SLT track on my 1993 503r . I would use the 1994 driveshaft, and the complete suspension too..! Is it possible? Is it the same frame from 503r to 503 slt ? Thanks and sorry for my english ;)
  6. Vintage Ski Doo's
    Hi I'm new to this forum. So please forgive me if I am in the wrong spot. I just picked up an 1987 Stratos 503 and I would really like to put reverse in it. I know that the Stratos did not come with reverse, but could someone please tell me what models might work to do this conversion. I would...
  7. 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
  8. 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...
  9. Vintage Ski Doo's
    what is the stock jetting for a dual carbed 503 running 2 vm34s? is there any jetting that would make more power than others? also what height does the float need to be set at? thanks in advance.
  10. 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...
  11. Vintage Ski Doo's
    looking at doing a cdi conversion on my 503 rotax. it is from a 1980 ski doo everest 500. i have the ignitions setup from a 377 from a 1990 safari L. what is involved in doing the conversion? i have access to a full machine shop, so I doesnt matter if i need to modify stuff. i also have the...
  12. Vintage Ski Doo's
    Hey everyone, brand new to this site and hoping to get some great advice. I have some questions regarding a motor swap that I'm planning to do on a 1991 Skidoo Safari. I'm swapping the 377 out for a 503 that came out of a 1980 Everest. The 503 is a single carburetor model and I'm wondering if I...
  13. MXZ / Legend / Summit / Grand Touring / Formula
    Hello I just picked up a 1995 formula sl 500 fan cooled. I tried to research the best I could but could not find any reliability info on these sleds. I bought it mainly cuz it was a good deal and it started first pull, cold, after sitting the summer (not sure how that was possible but it...
  14. Sledding - General Discussion
    Some info I have found from the web, some from Skidoo Race manuls: Rotax 582UL(Skidoo 580/582/583) Maximum power 65HP / 48KW @6500 RPM Maximum torque 55.3ft-lb / 75NM @6000 RPM Maximum RPM 6800 RPM Bore 2.99" / 76.0mm Stroke 2.25" / 64.0mm Displacement 35.44cu.in. / 580.7cm³ Compression ratio...
  15. 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
  16. Skandic / Expedition
    Help? I am new to the form but have been reading a few posts and you guys really know your stuff so I was wondering if you could maybe help me out? Can I drop a engine out of my 2000 skandic sport 503 and take a 88 stratos 503f and drop it right in with out any modification? Top end of mine is...
  17. Sledding - General Discussion
    A Single Carb 503F use's a 36mm Munki carb. Intake ID 29mm, OD 34mm. Does anyone know if there was ever a larger Stock or Racing Single Intake that was a Bigger ID? Thanks Rich
  18. Vintage Ski Doo's
    Hi I'm new to this and I am looking for some help. I have an 88 safari 503 and blew my secondary clutch. I was told by someone that a 89 377 secondary will fit it. I bought one and it is different. Just wondering if anyone knows if it will fit before I tear it all apart. If not does anyone know...
  19. Vintage Ski Doo's
    I was wondering if anyone has ever taken a safari 503 and converted it into a 503R?? Is it as easy as taking a gearbox from a 503R and replacing the chain case in the 503? Or is there a lot more needed in order to do this?? I know a guy who has a complete 503R parts sled and was wondering if its...
  20. Sledding - General Discussion
    Any one have any Skidoo/Rotax Tuned Pipe CAD, etc., files that work good for any Skidoo/Rotaxs, 380, 503, 583, 617, 670??? Rich
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