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Discussion Starter #1
Well a few years ago a friend dumped these 2 old snowmobile engines off on me for free. One was running but disassembled, the other for parts seized by years of internal rust. So I'm finally finding time to start working on these motors. I don't know what sled the good motor came out of. Here is what the label reads:

Rotax-WERK AG. WELS
Mot. No. 1944510
bore 2x64,5 mm, stroke 61 mm, capac. 399 c.c.
MADE IN AUSTRIA

How can I find out what sled it came from? Knowing what it came from could help me in ordering some parts. :confused:


Also, It's been a few long years since high school shop class. Where could I find a good article on rebuilding a snowmobile engine? I know I'm going to need new rings, but hell if I can remember tolerances between pistons, rings, and cylinder walls.

Thanks you very much for any input. If you want I could post some pictures of what I am up against. Heheh. :rolleyes:
 

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If there is a carburetor(s) with it, what's the model number? Tillotson ??? if it's an HD model it came off a TNT if it's an HR model it could be Olympic or Nordic.
 

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If there is a carburetor(s) with it, what's the model number? Tillotson ??? if it's an HD model it came off a TNT if it's an HR model it could be Olympic or Nordic.[/b]
I glanced at it just before heading out to work, it is a single tillotson carb, but i couldn't find a number, it's pretty dirty as you can imagine, but where would the numbers be located?

Anyone know of a rebuilding guide?
 

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I glanced at it just before heading out to work, it is a single tillotson carb, but i couldn't find a number, it's pretty dirty as you can imagine, but where would the numbers be located?

Anyone know of a rebuilding guide?[/b]
It should be stamped on the flange where it bolts on the manifold.
 

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It should be stamped on the flange where it bolts on the manifold.[/b]
Ok, the carb is an HR, so its an olympic or a nordic motor, can I narrow it down anymore? like by years? I need gaskets and rings for this thing at least.

Still looking for a rebuilding/overhaul guide. Thanks!
 

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Ok, the carb is an HR, so its an olympic or a nordic motor, can I narrow it down anymore? like by years? I need gaskets and rings for this thing at least.

Still looking for a rebuilding/overhaul guide. Thanks![/b]
Olympic ********* Nordic
1970 - HR16A **** 1970 - HR40A
1971 - HR76A **** 1971 - HR40A
1972 - HR76A
1973 - HR134A
1974 - HR134A
 
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