I've never owned either, but the Passpartout seems very similar to the Cushman Trackster. I remember looking at a bunch of youtube videos and various websites. While it certainly looked fun, my impression was that it's capabilities were pretty limited. Especially compared to a modern, mountain-performance snowmobile.
If my memory is right there were also a bunch of product liability lawsuits as people were seriously hurt when the heavy machines rolled over on the driver and/or passenger. That may have ended their product lives.
It was fairly similar to a Trackster. It was quite slow compared to other vintage snowmobiles, so yes,
extremely slow compared to a modern mountain sled.
![Sad :sad: :sad:](https://www.forumsforums.com/3_9/images/smilies/SushiSmilies/sad.gif)
But name me one snowmobile that can turn around easily, under it's own power, in a garage stall.
However, when I spoke with Bob by phone, he warned me about some shortcomings of the Passpartout.
The Sachs 2-stroke engine was popular and so had been produced in a rush. As a result, the crank seals didn't seal to the blocks properly, leading to air getting sucked in. So the engines were hard to adjust and, more dangerously, were prone to unintended acceleration from idle. If left in gear, they could start moving by themselves, a bad thing if you've dismounted to open or shut a gate... It was fixable, just a PIA to RTV in new crank seals.
The engines were forward-mounted and kind of high. They steered by either declutching one track or braking one track, depending on how hard a turn you desired.
Going downhill, the declutch method was ineffective, so you had to brake turn. Bad idea, as they would tend to roll over forward, often leading to real bad things for the driver. A rollover was even more likely if you used the brake! It was a great system for flat land, but dangerous on hills.
Lastly, while not so much a safety issue, the declutch method of steering was a real problem going uphill, as you lose 1/2 of your uphill drive.
Still, it was real fun to drive, and it got more attention than any other antique sled.