I just got this ST 40 ABC and haven't seen one quite like it, and I've owned a lot of ST's. Markings are different, older model, Italian made -

Super Tigre called it a G40. The case was sandcast; it was ABC as you mentioned, and I think it was schnurle ported. I've got an old ad introducing the engine. I think was was quickly replaced with the S40. It took me over a year of looking before I found one on ebay. I can dig out the magazine and post the ad next week.

I've got one on a Goldberg Skylane 62. It needs an adapter to take the Super Tigre muffler.

Jim

It's obviously schneurle ported.

An excellent engine. Responds well to a tuned pipe if you are so inclined.

Did they make a 60 size like that one?

Originally Posted by Lifer

An excellent engine. Responds well to a tuned pipe if you are so inclined.

It came with header and a tuned pipe, haven't decided what to do with the engine, may sell -

The S-40 ad appeared in M.A. August 1980. The G-40 ABC was in M.A. March 1981, so the S-40 predates the G-40, opposite of what I thought. The G-40 ad states it is a development and refinement of the S-40. The S-40 was $100 retail and the G-40 was 30% more at $130.

Jim