Holey Too Much Free Time Batman!
A while back, I bought a weird 57 BSA with some pretty unique mods including a Sportster front end. It's nothing compared to what I saw today.
The same guy owns all three bikes and does ALL the work by himself.
The first two pics are of well restored Sunbeam S7's. One is a '48, the other is a '55. They are 500cc twins, 4spd transmissions w/shaft drive, and 6v electrical. Pretty much all original spec.
The third bike gets freakish. It also is a S7 but apparently he did not have an engine for it. Of all the things one could think of to install in a old British bike, he chose a 1000cc Hatz diesel twin. These engines are often found in generators at your local tool rental place. As soon as he got the engine, he rebuilt it. Parts are still readily available. He lengthened the frame of the bike about 2 inches to fit it in. The original Hatz flywheel & clutch went away. Then he made a new flywheel and adapter plate to mate it to the Sunbeam trans. So far, so good. I always thought a diesel bike would be very cool & unique. The only one I ever saw was on some ratbike site.
The problem was that he could not start it. I don't mean that it wouldn't run. He just couldn't start it. It couldn't be kicked over with the Sunbeam kickstarter. He then fabbed a gear reduction attachment and tried to use a chainsaw engine to get it going. No luck. I guess the original starter couldn't be used because of the flywheel changes. I never got that complete story.
I would've continued to work that angle but what do I know?
He decided to convert it go gas! Yep. He machined the pistons changing the compression ratio from 20:1 to 6.5:1 . He retapped the glowplug holes and put in spark plugs, fabbed an intake manifold and attached a tractor carb, and made a distributor by hand complete with timing retard lever for easier starting. He made the cylinder cooling fins by hand too.
While this could look great next to my Bizarrley, the odds of me owning it are pretty slim. If it did happen, I might just try to refit another diesel into it.