you might try looking under the belly pan on the side with the chain case, at some point ski doo started putting a drain plug in the chain case, a friends 2000 mxz has the drain. I'm not sure if the 99 does or not. my old 96 didn't have. as far as the coolant goes, I'm not real sure if there is a drain for that, I've always just unhooked a hose and drained into a bucket or small bowl then transfered to a bucket. If you don't have a drain plug for the chain case see if you can get your hands on a gear lube suction gun to pull all the chain case oil out so that you don't have as big of a mess. just my .02
Sounds about right, buy you should check your manual for specs.
One thing I do when changing chaincase oil on my chaincase which doesn't have a drain is to tip the sled over on it's side and remove the cover, then use a tool like rev500ss says. I figure if I'm gonna be changing the oil, might as well take a look at the gears and chain, right?
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