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Discussion Starter #1
I'm trying to figure out which rotax engine I have. I don't know what year or make of snowmobile this engine came out of - it's on a go-cart. I think I remember the guy I bought it from said it was in a Ski - Doo, but that was years ago. A sticker on the pull start says Bombardier. There is a tag on the engine that states the following:

Rotax - Werk AG Wells
Mot. No. 1500919
Bore 2X62mm - Stroke 61mm - Displacement 368ccm
Made in Austria

The engine is a 2 cylinder - 2 stroke - fan cooled, it is pull start with only one Tillotson carb. and has two small black coils. I believe it was about '85 or '86 when I bought it. I'd like to rebuild it but need to know what exactly it is before I can buy the gasket kits and what not. Any help with figuring this out is much appreciated. Thanks. Tom
 

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Discussion Starter #3
scrammy650, Thank you for your reply. Yes that's what I was thinking as well. Do you happen to know what year production started for this engine? It looks like about 1980 to me - but not sure - and was discontinued about 1999. If any one knows how to identify the year of this engine I would appreciate the help. Also, would a gasket set have to be the exact year of the engine in order for it to work or would a 1980 year gasket set still work just fine in an engine that's lets say a 1985? Any advise or help is much appreciated. Thanks. Tom
 

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Sorry I can't find any cross reference to year from the engine serial number. You are right in that 1980 was the first year for the 377 engine. It looks like the gasket set is the same through to 1989 and after that it changed to a different number. Not really being a Skidoo guy I don't know what difference in the gasket set after 1989. I am assuming it is a small change on something but not head gaskets or cylinder base gaskets though. This is the parts site I was looking at: http://www.mfgsupply.com/snowmobile.html
I also came across this site which shows the 368 cc engine was used into 2001 in a couple of sleds. http://www.snowmobiledata.com/sd/skidoo/index3.html
 

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Discussion Starter #5 (Edited)
Thanks for your input retiredpop. Again I had the same conclusion. After looking at some parts web sites I noticed that the part # for a gasket set for a given model of engine applied to numerous years in a row for that engine. The last digit in that part number changed from an A to B then to C for groups of years that model engine was made. My conclusion was that there were probably some minor changes in those gasket sets for each group of years produced - each part number was the same just the last digit (letter) changed. That engine was a very good design hence that fact it was made for such a long period of time - if something not broken don't fix it - go with it. I purchased the engine in I think 1985 so I'll go with the part # that ends in an A. Thanks for all the help guys. I needed some second opinions and input on the matter before moving forward with the project - Thanks again. Tom

Thanks for the links retiredpop - haven't checked them as of yet but will soon - it's nice to have multiple sources.
 

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If it has a Tillotson carb it's probably not a 377, unless someone really went out of their way and fabricated a Tillotson intake for 377.

My guess is it's a 371, which I think was only ever used in a 69 Nordic. Unless it's a boxer :)
Parts for a 371 might be hard to come by as it wasn't used very much. A 399 is pretty much the same engine, only differences are in the cylinders/pistons/heads. But a gasket kit for a 399 would probably work for a 371. Use the head gaskets from a 377 if the bolt pattern is the same (which I believe it is).
 
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