Transform to robot mode: fold the track back so it points out of the back of the figure with the waist pulled back so the legs are roughly in the same direction. Fold the head down to form the snowmobile's windscreen. Fold the chest forward. Straighten the arms and rotate the elbow 180 degrees. Bring the arms together above the track to form the rear of the vehicle. Manipulate the hinges at the front of the track so that the top plugs into the peg under the saddle. Fold the heel spur forward, then the top & bottom of the legs at the knee and rotate at the hip so the knee faces forward. Wiggle into position under the front of the snowmobile. Fold the chest down between them and position the skis.
The Snowmobile itself isn't that bad form wise. Functionally however it's an entire different ball game: neither handle bars nor skis move from side to side and the tracks underneath the rear of the bike are fixed with no wheels mounted in them to allow the vehicle to move. It's biggest problem however is when you try to use the toy with the figure it comes with. Sergeant Chaos is about an inch and a half high, with universal joints at the shoulder, hip & knee as well as a turning head. By himself Sergeant Chaos is fine but once he's with the Snowmobile it becomes obvious that he's hideously out of scale with it. I think for this size of toy you'd probably be looking for a figure at about 3 inches high, double the size of Sergeant Chaos yet smaller than those in the Star Wars or GI Joe lines. The C-clip weapons in this mode can be attached to the skis at the front or the bars at the rear of the seat.
Icepick has a third mode as a weapon for a larger toy: Fold the tread out behind the vehicle, then fold forward so it's between the skis. Split the tread in half and fold back on itself to form a chain saw weapon. Use the Minicon port, now under the saddle, as a handle for a larger to to hold it. Unfortunately the weapon mode is now far too long, a good six inches, with just the front third being the actual business end. A different transformation that ended up mounting the handle further up the weapon instead of the opposite end to the blade, would work much better.
I'm sorry but Icepick didn't float my boat at all. It's got flaws both as a toy and as a package with it's driver. Fortunately some of the other Human Alliance toys are a lot better.
White becomes black
Black becomes orange
Clear Purple becomes clear green
He comes with a repaint of Human Alliance Sideswipe and a repaint of Major Tungsten as the new version of Sergeant Chaos. Including this Sideswipe is madness: he can't hold Icepick's weapon mode!