All the photos and informatio below are courtesy of Bob Mackin.

Bob on his 73 at some grass drags.

Jim Adema at Ironwood

Jim Fonger on his 72 Tjet. It's actually a 2 year old machine and he still beat the factory Yamaha guys.

Jim Fonger in 73 on a 72 tjet.

Kawartha Cup 1973

The 74 Thunder Jet driven by Bill Yobe, it was pushing 125hp, and need the really aggressive hood scoop to cool the sled. Everyone laughed at him, but he turned around and beat them all.

Bob Mackin on the incredible Thunder Jet II protoype.

Gene Bloom on his Rupp.

Factory Yamaha Sled

The Rupp Super Sno-Sport

Dual Engine Polaris

Dual Engine Ski-Doo

Snow Pony Peroxide Rocket