Hi Solirossi,
Sorry, I missed that link in your first post.
It is a twin rail SB45.
No, I do not believe the single rail machines are better.
Personally, I prefer the twin rails for aesthetic and practical reasons.
[They are easier to clean].
It may be that the cracking in the rails on some machines has been caused by
poor engine tuning over a period of time; or not ensuring the clutch is secure on the
engine crankshaft. The Cracks appear to be due to fatigue attributable to excessive
vibration... There appears to be no single cause or explanation.
Looking at the photos, this looks like a very good restoration, and of the highest
class. But, clearly, no moderator can guarantee that. It presents as a good,
sound machine that can deliver years of faithful service.
An inspection would be needed - checking for a non-smoking, sound engine, and a
close inspection of the rails, chains and sprockets.
I hope this helps.
-----------------------------------
JACK.
