Steven W Marquardt has a vast treasure of old race photos. Here’s part of his stash from West Yellowstone Montana in the late winter of 1975.

My apologies for originally attributing these photos to Greg Marier.

Jim Bernat and Larry Rugland on their 440’s.

Don Omdahl on his 650cc PDC Polaris

Leroy Linblad with a prototype 440cc liquid cooled engine.

Don Omdahl on his 650cc PDC Polaris. I can’t imagine how much fun it was to ride this monster on the huge, high-banked West Yellowstone track!

Larry Rugland and Don Omdahl’s 340cc PDC machines.

A very interesting mix of factory and non-factory drivers, yet all have factory looking sleds.

The late Darrell Courtright