Roger Mulkey and his father, Altus AFB, Oklahoma 1959. They bought kits from Rupp and Roger assembled them. Guys in the Air Force bought them from them and they raced karts on courses they laid out at the base.

1959 Dart Kart

I think it might be a Duke Fox Kart, John Wall had one at Quincy, check with him.

Was the HL-264A the double pumper?

Rupp made knock off rear wheel hubs for both 1" and 1-1/4" inch axles. The 1-1/4" axle also requires 1-1/4" brake hubs and engine mounts. It kart racing terms that model was a complete failure.

Could be a J or K Dart Kart. K would have a conventional single tube front axle.

Excellent post.

If anybody else is interested in a period correct reproduction of the GEM mount, Terry Ives has them ball burnished with his manifold castings so they have the exact surface finish the GEM mounts had.

I saw some new cast aluminum Airheart caliper/MC mounts at Terry Ives shop a couple weeks ago. I think they were for the standard diameter disc.

The piston on the right has a light weight wrist pin. Both of them could stand to have the pins shortened for better oil access to the bearings.