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rotax 503
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  1. Vintage Ski Doo's
    I have a few questions on taking a 1980s blizzard motor and putting it into a 1995 formula SL 500 I would appreciate your input as well as the additional challenges I might face 1. It appears that both blocks are the same with the exception of the fan shroud casting my plan is to put the fan...
  2. Sledding - General Discussion
    Hello. My Rotax 503 ultralight engine locked up on me. Upon close examination (total tear down) I found that circlip worked itself in to the combustion chamber then wedged itself btween cylinder and the piston and damaged both. So with piston it's no problem - easy enough to replace. The jug...
  3. Sledding - General Discussion
    Hello folks. My ultralight's Rotax 503 seized yesterday and so now I am facing the rebuild. Not sure what exactly seized yet because I havent taken the engine off yet but I want to go through the engine and since I have to go in to the PITA of taking it off and taking it apart I want to replace...
  4. MXZ / Legend / Summit / Grand Touring / Formula
    I recently purchased a 97 touring sle with the 500 fan cooled 503 rotax engine. The sled runs strong, however, I noticed some oil staining where the top end of the engine bolts to the bottom end. I torqued the head bolts to the proper specification and I am monitoring. Is there anything I...
  5. Vintage Classifieds
    What's a reasonable asking price for one of these units? Twin carb 503 out of a 1993 Skandic II. 4400 km and runs decent. Haven't checked the compression yet, but assuming it is up to par - just curious how many pesos I should look for. Cheers
  6. Vintage Ski Doo's
    Hi there guys, need some help. I need a carburetor boot (after carburetor, connects to carburetor and intake manifold). I have a single mikuni vm-36 carb, and the boot has cracked and dried up, causing a split. I want to get a new boot. I ordered one, part numbe 7-100-13, and it is listed under...
  7. Vintage Ski Doo's
    Hi there dooers. Ive got a 1980 Bombardier Ski-Doo Everest 500, 695 original imperial miles, the torque reaction slide suspension is almost ll stock. All I've done is repack the bearings with new grease and replace a busted slider and shock. One of the bearings went to crap, and I need a new...
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