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  1. Skandic / Expedition
    So I'm working on a 1996 Rotax 377 in a Scandic. Ducati ignition system. So the engine abruptly died. No spark. Measured stator and trigger, all values were within spec. So ordered a new coil/CDI (SPI brand). Got a weak spark, now and then, so no success. Because the sled was outdoors when I...
  2. 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...
  3. Skandic / Expedition
    My 1993 Skandic II 377 has Mikuni carbs VM 34 428 on PTO side and VM 34 429 on mag side. What is the difference between these two carbs? Also, does anyone have info for the factory settings. Can’t find any info on these carbs.
  4. Vintage Ski Doo's
    From what I understand, the 447’s are prone to cylinder damage and its pretty rare to find replacement jugs for them. I also have heard that the 447 engines are identical to the 377 (which are a dime a dozen). Has anyone had success with puting jugs/pistons from a 337 into a 447? Is it that...
  5. Vintage Ski Doo's
    Hey guys, So I have a 1994 Safari 377 for my girlfriend, but she always has trouble keeping up with the larger sleds. I was just wondering if you guys have any ideas of what I could do to make it a bit quicker? I know I am not going to turn it into a 600, but I am just looking for anything that...
  6. Vintage Ski Doo's
    Hello all, got a 1980 Mirage II with a 377. Previous owner said sled didn't run. Took the motor apart and nothing looked terrible, except the crank seals looked like they were done. Rebuilt the motor with new seals, pistons, condensers, plug wires. Compression is over 100, both sides...
  7. Vintage Ski Doo's
    So this is happening now. I know citations are kinda going to "old news" now, but thought I'd see if anyone out there is still tinkering... A little fabrication never hurt anyone I guess eh? 1980 skidoo Citation and the short track was BEAT ! Cut it off and since I had a 4500 sitting with a...
  8. Vintage Ski Doo's
    I am currently sprucing up my 85 SkiDoo Safari 377E for my 8 yr old grandson. He looks at my sleds....[2] 04 500SS GSX's.....and always wants what is on them. I hooked up a shield heater plug and have put heated grips on as well. It is where to get power for the grips that I am looking for...
  9. Vintage Ski Doo's
    I've recently re-visited an old project. This is a school technology class project that has been in progress off & on for several years. However, I am determined to see it move under it's own power and groom some ski trails. The project started several years ago when a local community member...
  10. 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
  11. Vintage Ski Doo's
    how do you take the belt off a safari 377 1990 my buddy and i couldn't for the life off us soo we took out the whole motor we decided to give her a good cleaning at the same time we are doing an oil delete to the machine to what is the mixing ratio
  12. Vintage Ski Doo's
    im wondering what can i do to increase the horsepower of a 377 rotax. short of doing a tuned pipe and dual carbs, what can i do? i already plan to do that, but does anyone know anything about porting/polishing? what about milling the head/jug? how much metal can i take off? thanks in advance
  13. Vintage Ski Doo's
    Hey guys, i need some help. I have a 1987 Safari 377, it always starts first pull runs mint, replaced almost every part on the machine by now, except for the stator, cdi, and the lightning coil i believe what they call it. The machine will run for about 15 mins of driving until it gets warm...
  14. Vintage Ski Doo's
    Hey out there, smarter people than me, I was hoping this wasn't the case, but after being a good little boy and doing some reading in the forums here I've come to the conclusion that my crank bearing is shot. When I had the engine out i didn't notice any grinding or wiggle in the shaft but I...
  15. Vintage Ski Doo's
    looking at buying a 1990 safari l. it has a brand new track, the seats a little ripped, but it has a blown top end. everything is there. the guy wants $250 is that a good price?
  16. 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...
  17. 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...
  18. Vintage Ski Doo's
    What Compression, does the Standard 377/380 use? Was there a Low Compression Head, and a High Compression Head, maybe for the Mts? Did they ever make a Fuel Injected 377/380? Was the 377/380(62mm x 61mm) 368.8cc ever called something else? Thanks Rich
  19. 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...
  20. 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
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