I have a technical question(s) that I hope ODK engineers and members
can help with. I am writing a draft for the Victa Imperial lawnmower.

It's about the Victa engine that powered these machines from 1972.

Context:
For whatever reason, Victa introduced this machine in 1967 and powered
it with a Kirby four-stroke. No two-stroke version.

It would take another 5 years before Victa finally powered their Imperials
with their own Victa 2-stroke. This was a very special version of the Series 70
Mark 2, with the then standard decompressor, but with two unique features.

(1) The carburettor was a modified G3 - making it ungoverned.
(2) A cylinder head spacer was added.

My questions relate to the head spacer. Why was it added?
- Given that the governing of the machine was via human being, did the spacer
make the engine more responsive to hand throttle?

I do not have the technical expertise to answer this question.

Cheers
-------------------------
JACK.

[Linked Image]