Bultakenstein – Original [Aborted]

I’ve been chatting with some Bultaco experts about an expansion chamber designed to my Alpina cylinder. The short answer is that I can’t find evidence of one. Even when going with aftermarket … Exhaust designRead more

I did some timid lightening of the seat base and bolted it to the Airtech shell. After I took these photos, I temporarily spray-glued three sheets of 1/2″ polypropylene packaging foam to … Continuing with the seatRead more

I’ve never mounted a fiberglass seat before, so I might be going about this all wrong, but I knew I needed to add some sort of additional structure under the seat to … Seat base fabricationRead more

Playing around with color ideas today. I’m going to try to match the red color of the tank, but I’m planning on reversing the base color and accent color on the seat … Brainstorming graphicsRead more

I think I can make this seat work. I measured points a consistent distance back from the back wall of the seat, then used a contour gauge to transfer the inside shape … Closer seat examinationRead more

The Norton Production Racer seat pan arrived from AirTech Streamlining a couple weeks ago, and I’m super disappointed in the quality. I still think the shape of this design is perfect for … Proddie seat is warpedRead more

I decided I wasn’t happy with my original chain guard’s homespun appearance. Thanks to purchase of dimple dies and a bead roller, Chain Guide 2.0 has turned out much better. It took … Chain guard #2Read more

To create the main/upper chain guard, I first made up a preliminary mock-up out of scrap 1/8” plywood and painters’ tape, just to get the basic dimensions needed. I then cut out … Chain guard fabricationRead more

I mounted the lower chain guard this morning. I bought one from a ’75 DT175, so it should just bolt up to my DT swingarm, right? Of course not—this is Bultakenstein, after … Lower chain guardRead more

Looking at the instrument mounting holes on the upper triple clamp got me thinking, and led me to create a much less ugly and obvious brace arrangement for the bars, which simultaneously … Revised handlebar bracesRead more