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Bultakenstein

A shadetree amateur’s attempt to create my own low-budget, scratch-built motorcycle, to find out whether I could do it.
Nearly 15 years later, I still don’t quite know the answer.

Exhaust installed!
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  • Bultakenstein

Exhaust installed!

January 11, 2025January 11, 2025

My expansion chamber is back from my welding guy, and he did a great job on both the new section of headpipe and the hanger bracket. I bolted it up and I … Exhaust installed!Read more

Rear brake actuation
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  • Bultakenstein

Rear brake actuation

January 3, 2025January 3, 2025

I need to get serious about re-thinking the rear brake. I had been using an actuating rod, the method used by both the Pursang (frame) and GS450T (rear brake). Unfortunately, my brake … Rear brake actuationRead more

Rubber-mounted expansion chamber hanger
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  • Bultakenstein

Rubber-mounted expansion chamber hanger

December 31, 2024January 3, 2025

This is my over-engineered rubber-mount expansion chamber hanger, courtesy of SendCutSend and South Bend: I took a lot of time to locate the hanger bracket to the exhaust in the exact right … Rubber-mounted expansion chamber hangerRead more

Exhaust mock-up
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  • Bultakenstein

Exhaust mock-up

July 12, 2024January 1, 2025

I have worked through the initial issues in adapting the aftermarket Astro expansion chamber to Bultakenstein. The headpipe and main body, originally designed to be held together with springs, had been welded … Exhaust mock-upRead more

Expansion chamber tailoring
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  • Bultakenstein

Expansion chamber tailoring

January 11, 2024January 1, 2025

I bought an exhaust for it last August. With shipping and tax, the total cost was $240—not an inexpensive purchase. It’s an aftermarket, but I have my doubts about the seller’s claim … Expansion chamber tailoringRead more

Engine back into the frame
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  • Bultakenstein

Engine back into the frame

August 10, 2023January 1, 2025

The motor has been sitting in a crate ever since it returned from the West Coast back in late January, while I’ve been devoting my attention to The Bride. However, my friend … Engine back into the frameRead more

Engine and frame color ideas
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  • Bultakenstein

Engine and frame color ideas

January 26, 2023January 1, 2025

Bultakenstein’s motor has returned from its West Coast spa vacation, looking very healthy. True to the spirit of the bike, it’s a mix of parts. The cylinder I sent to Ralph wouldn’t … Engine and frame color ideasRead more

Bultakenstein’s motor is built!
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  • Bultakenstein

Bultakenstein’s motor is built!

January 5, 2023January 1, 2025

I got a call from Ralph Weidling at Bultaco Parts US. The salvage Model 143 Frontera motor I sent him has been completely rebuilt, and has great compression. It’s mostly a stock … Bultakenstein’s motor is built!Read more

Engine set for rebuild
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  • Bultakenstein

Engine set for rebuild

October 3, 2022January 1, 2025

Ralph Weidling just called to say he’s ready to start rebuilding Bultakenstein’s engine. I sent it to him back in mid-June, but I was in line behind couple of full restorations. We … Engine set for rebuildRead more

Ten Years On…
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  • Bultakenstein

Ten Years On…

October 25, 2021January 1, 2025

Today marks the 10-year anniversary of the first post I wrote about Bultakenstein. At the time, I called it “Project X.” The project is still officially ongoing, though I haven’t touched Bultakenstein … Ten Years On…Read more

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