Bultaco

I was down in the basement this morning and moved Bultakenstein’s rear wheel out of my way (yet again). I happened to check at the date stamp on my rear tire: 4310. … Use it or lose itRead more

I just ordered Chop Source’s “basic” frame jig kit. Essentially I’ll have what’s shown in the photo, minus the center cradle supports and transverse legs. The center part I really don’t need, … Frame jig on its wayRead more

My twin-shock swingarm arrived yesterday. It’s not quite the bolt-up replacement I was hoping it would be, but it will work if I decide to go that way.Compared side-by-side, the DT175 swingarm … Swingarm comparisonRead more

So, a few months back, I happened to find this photo of a converted Bultaco Pursang on the web. Looking at it, all I could think was that if I had simply … Abandon the monoshock?Read more

I finished the four frame lugs, cut the tubing to length, and mocked up the seat loop. I’ve decided to have it professionally welded. Unfortunately, my neighborhood welder can’t get me in … Seat workRead more

I was looking at some of the smaller ball and needle bearing sizes on McMaster-Carr’s website. I’m thinking of using these self-aligning, flange-mount roller bearings to mount my shifter crossover linkage. Less … Self-aligning flange bearingsRead more

I mentioned this in passing early on, but one thing I am planning on doing is building a crossover shifter arrangement for a modern standard right-brake/left-shift arrangement. (I’m old enough that my … Gearshift designRead more

I cranked up my lathe to make the fittings to connect the pieces of my new rear frame section to each other and the existing frame. I’ve finished one of the four. … Seat tube fittingsRead more

So, the laser cut (yes, really laser cut) rear engine mounting plates Garrett had made arrived yesterday. They’re absolutely perfect. Here they are mocked up with some allthread. The bottom mounting stud … Laser cut engine platesRead more

My podcast co-host Garrett has offered to laser* cut my engine plates out of 3/16″ steel. The only downside is the turnaround time is 2-3 weeks. I guess the interim gives me … Revised engine platesRead more