That old cat cleaned up great!  Nothing beats that seat pattern.  They're like fertilizer for mullets.  Those Rotary engines sound so dang good.  Nice video!

Kevin: "haven't seen anyone do a snowmobile revival"
Derrick: "A guy just did like 3"

That sound the rotary makes is definitely normal - for a rotary. I've owned six first-gen RX7s and one of these 303 cc Sachs engines from a '74 Arctic Cat Panther. They need a 40:1 pre-mix of fuel: 2-cycle oil in order to lube the apex and side seals, as well as the needle bearings inside the rotor that rides on the eccentric shaft (ie: "crankshaft") lobe.

These Sachs engines have a very interesting engine cooling feature known as "charge cooling". The external fins and fan pull a large amount of heat away from the engine, but the rotating mass at the engine's core needs more than that.

Unlike in the RX7 engine, the Sachs uses a solid eccentric shaft. But like the RX7, the rotor is hollow, allowing cooling media to draw heat away from the rotor.

In the RX7 two-rotor oil and liquid-cooled engine, this media is engine oil, pumped through the hollow eccentric shaft. But in the Sachs engine the internal cooling media is air-fuel-oil mixture. That's right: Before the air/fuel/oil mixture enters the combustion chamber after leaving the carb, it is first routed INTO A PORT ON ONE END OF THE ENGINE near the center of the engine where the eccentric shaft resides, through the needle bearings and hollow interior surfaces of the rotor (which both cools and lubes the center rotating mass of the engine), out another port on the opposite side of the engine and finally through a passage that takes this intake charge to the intake port(!) Hence the name "charge-cooling".

I was going to use mine on an ultralight, but that never materialized. Maybe that's a good thing. If memory serves me correctly, these 303cc engines produced 19.5 hp at around 5500 rpm, and around 28 lb-ft of torque at around 5000 rpm. These sleds were very fast once up to speed and in track racing They loved to rev. In the high rpm ranges the power curve dropped off much more gradually than with piston engines. But off the line they were slow to accelerate - owing to the rotary's inherent weak torque in the low rpm ranges.

Put grease on the tap to catch the shavings.

Yes I would definitely like to see this machine again. And the Maytag , you have to get it running

Would love to see some small engine/oddball revivals like the maytag.

I would like to see that single cylinder Wisconsin running and the maytag motor

I think the problem is the glove.  You have a vacuum pump with 2 layers.  This means the first layer gets the full force of the vacuum, but it can only pull on the second layer with whatever vacuum it has in between them.  Just make it one layer of glove and see if that fixes it.

When I was 12 yrs old my dad bought a brand new snowmobile, and it was the exact same model,  I rode that machine for years and loved it so much, thank you for bringing back great memories for me, now 64 yrs old, you made me fell young again,  thank you !!

According to the Wisconsin Auto Museum's display, the OMC rotary was so powerful it was banned from competition. It was also quiet. We had our sled stolen right out of the front yard and never heard it drive away. We found it 4 blocks away with the drive belt wrapped around the clutch.

I did not know Arctic Cat had a rotary also.

I had that same machine back in the late 80's, the worst part about it was how often it would get stuck and how heavy it was when you were drunk.

I was waiting for John’s mullet to come to life as a second set of hands. He’s like the Joe Walsh of snowmobile repair.

Would like to see the Maytag and the seized engine revival

I felt like yelling crank seals at my phone this whole last half of the video

make sure you run premix in that rotary. its a 2 stroke motor basically, so mix the fuel. it will make the rotors and seals last longer. also rotaries go great with turbos, like a er trip made in heaven

If Mook had rebuilt the "carbotater", it would have run just fine.

having that glove on there is like having two of those diaphragms stacked on top of each other.  Might run better if a fella cut one side of that glove off.  Top side is moving, bottom side probably isn't moving much.  Just a thought.

I saw the thumb nail and thought, "How many snow mobiles does VGG need!?!" Caught me off gaurd when he wasn't the one introing the video.

Now imagine doing some of those operations 3 miles out on a frozen lake in the moonlight at -20 F. That gets you the total experience.

The minute I saw him cutting threads in the spark plug hole and letting that crap go into the motor especially a rotary with its seals that everyone knows about you just wiped out the seals and surfaces thank for destroying a motor that is hard to find and many are looking for