Based in Utah, Mark is a machinist by day?able to run old school manual machines and program the latest multi-axis contraptions. He spends his down time building bikes and competing in land speed racing.
He once told us he typically builds a new race engine each winter?from scratch, starting with a big billet of solid aluminum. He didn’t quite have to go to that extreme on the Bultaco, but he still had his work cut out.

Mark sourced the Alpina locally, then set about solving his first problem: the engine was completely locked up. ?I took it apart and thought: ‘these vertically split crank cases are a pain in the ass’,? he recalls.
?So I machined an o-ring groove around the main case and primary cover, so it wouldn’t leak and I wouldn’t have to take it apart again. The rest went back together as it should.? Thanks to copious amounts of elbow grease, the engine now looks brand new. Mark fitted a flat slide carb that he found in a box, adding a curved intake to help it clear the frame.
The exhaust is a ?stainless sheet menagerie,? with some guesswork to get the port timing right. ?It seems to work OK,? he says. (Why are we not surprised") ?There is something that is uniquely Spanish about Bultacos, and I am sure the other brands from this area and era too.
“I love the work that went into them.?

Two machined legs, connected by bent round tubes, form the swing arm. It’s hooked up to a new rear shock from Gears Racing.
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