Bultaco

One of the big challenges of this project has been trying to accurately locate of the rear wheel. Fortunately, as far as the frame itself goes, the only truly critical relationships are … Rear wheel alignmentRead more

Here’s the swingarm pivot, completed! The rear engine bosses will attach to these crosstubes; if you look carefully at either end, you can see the rubber mounting blocks Suzuki used on their … Swingarm pivot completeRead more

I got the 6mm thick outer spacers made up this morning. The engine mounting plates need to be spaced in because of two socket-head screws on the left, as well as to … Swingarm & motor mount fabricationRead more

I’ve got the frame bolted into the jig using the additional fittings, and I’m working on final alignment of the twin-shock swingarm.

With the Honda CL125S Resto-mod that had been taking all my time and attention finally out of my workshop for good, I’ve turned my attention back to this unholy collection of mismatched … Bultakenstein resumesRead more

After sorting out some details regarding engine mounts, I ordered a few bits of hardware (metric flathead allen bolts and 90° countersink end mills) needed to make it happen. While waiting for … Rear damper choicesRead more

I wanted to get all my current measurements down before I start messing around with the twin-shock swingarm, so I assembled the chassis with the YZ swingarm and snapped a couple of … More mocking upRead more

I picked up the frame from the welder last night after work. I’m pleased. Even though the whole point this project is learning the skills to do things myself, I think it … Back from the welderRead more

I was able to knock out my shock mounts and still deliver the frame to my friendly neighborhood welder yesterday. He didn’t see anything noticeably jinky about my design or or problematic … Frame weldingRead more

I initially made up these seat support gussets in which the rear “speed hole” would double as the top shock mount, with some additional thickness around it for reinforcement. Then, a couple … Upper shock mount fabricationRead more