Download file Artic Cat 1990 -1998 pdf - Artic Cat Manual
This electronic manual might help you a little. Another good tool is the part fishe at Brown's Leisure World - Home Page
They give you a good idea on how the sled was put together.
A few things to watch out, make sure the key that holds the flywheel in place is in there right! While putting the flywheel on it is possible that you nock the key from its spot without noticing. Make sure you also don't leave anything in the flywheel housing that might get cought in there. Make sure you put some loctite on the flywheel nut and torque it down to the proper torque cause you don't want that thing comming out on you, won't be pretty... Take you're time do it right cause you don't want to be back in that thing. Taking a flywheel off is not fun in certain circumstances.
Another thing that should be noted on this subject is that the stators are know to go bad often on the early 600 EFI's. Its not exactly know why they go so quick. The main cause of a stator failing is heat. If I where you I would drill some holes at the bottom of the housing were the stator goes so it can breath better. The holes will let air circulate in there cooling it down some. BUT, if you're not confident in what you're doing DO NOT ATEMPT IT! Another solution here would be to get longer, possibly higher quality bolts(they are metric) and add washers in between the engine and the recoil housing.
Hope this helps you out some. I'l be back in 3 days if you got some more Q's.