The manual has a very slow breakin recommendation. On this one, mostly the pistons (rings) that would require it. Tolerences are fairly snug so I don’t want to push it. I have a spare headpipe, so I think I will weld an O2 sensor bung on it and go ride it with my readout box, so I can verify mixture...

I got a dual cable Tomeselli throttle. This is not the desmodronic type that many modern 4-stroke bikes use, but both cables are pull to open. I made up both cables from some Venhill kits I have. The throttle is quite a bit lighter without the splitter (and old upper cable), smoother also. I then ma...

Tomeselli.

I’ve done a lot better knurls before, but this was a different tool, different lathe and different material.

The throttle cable adjuster had broken. I’m going to replace the throttle and splitter with a two-cable setup, but in the meantime, I made a new adjuster. The knurling is not very good- but it is functional

Great day for a ride up the Elwha (and other places)

I took it for a longer ride today- ran great! I found out why cold start was poor- the cable going to the ‘splitter’ that opens both of the starter valves had broken. I need to get some 3mm screws to bolt down the handlebar switch, a few other little things and ready to put some miles on it to break...

I mounted the carbs (fixed a gasket that was shipped incorrect) and fired it up! Cold start was not right away, but starts great warm. (Maybe enricher valves are not working correctly- cables are not great and new ones coming). It sounds really nice. I rode it around the yard, I had forgotten that w...

No distortion is excellent. Always a worry. Once reason I didn’t add a primary chain tensioner on the sei. They didn’t come with one (Hivoy chain) and tend to get a bit noisy eventually. But I figured a bit of noise is better than a ruined case. Plus I don’t expect to put that many hours on it anyway.

New front/rear tyres, tubes rim strips. New front brake shoes, adjusted and feels good. I did not arc the shoes in, I figured I would just ride it a little then see how they are seating. Also new O-ring chain and one wheel bearing (rest were very good). I will go for the electrics next, waiting on a...

Does the casting have a fair amount of contamination, making welding more difficult?
Aluminum?