Number stamped into front right engine casing?

[ANDY BROWN]

I have noticed a number stamped into my engine casing on an a65. Very small, reading 806? I can't find any reference to it in any of the manuals. It looks fresher than the engine numbers.

[JulianS]

This might be the answer - page from 1969/70 workshop manual.

[ANDY BROWN]

That explains it. Fantastic, thanks for that. I've only had the bike about 8 months and I'm trying to gather history for it. I had a gearbox problem recently and while it was apart I noticed a number of things that had been tinkered with. It has had a cylinder hone, new timing side bush, new valves and valve guides so I was wondering if the engine had been rebuilt by a builder who had stamped a number on it! I currently have 10 thou of end float on the crank though so my current thinking is I should have split the cases and checked everything. I was keen to get it back on the road and didn't check end float. DOH!