OutdoorKing Repair Forum Forums The History Forum Model Histories VICTA Models BULLETIN - G4 Carburettor - May 1975

Hello ODK History Lovers

The Victa G4 carburettor was revolutionary. This was a clever design specifically engineered
for lawnmower applications. Victa came late to governing their engines. The Predicta system of
the fifties - Victa Automatic was really a knee-jerk response to the mechanically governed
Villiers 7F (released in 1957), arguably the first governed 2-stroke lawnmower engine to be
used in Australia. The Predicta system, in comparison, was an engineering embarrassment.

About a decade later (1968) Victa introduced their first governed mowers - their air vane designs -
in the form of the G2, and later the G3.

This Technical Bulletin was issued to all Victa Dealers in May, 1975.
It includes an outline of the operation and servicing of the G4. The Bulletin also includes
a diagram of the original specification and service part numbers.

Acknowledgement and thank you to member ihatewetsocks for scanning these important
historical documents.

Bulletin Series 70 & 80 Head Numbers - 1977
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=38893

G4 & LM Carbies - Tye Davis:-
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=38908



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PATENT - The G4 Lawnmower Carby
The G4 Lawnmower carby was not a Victa invention. They were the 'assignee'
(they bought it) from two Australian inventors: William Henry Steele and
George Nejtek.

The object of the patent (filed in 1973) is most revealing.
The objectives were:-
- Reduce exposed moving parts
- Reduce exposed orifices
- Remove the cost and complication of a mechanical governor
- Add a pressure sensitive capsule, for integral carburettor governing

The original patent does not appear to cover an important innovation -
the incorporation of the throttle cable inside the intake snorkel. That was
a great feature for protecting the throttle cable from snagging on obstructions.
By way of a feature-less observation, there appears to be no means of priming
the carby with fuel in the original patent. This was originally promoted by
Victa as a feature. A season or so later we had a primer bulb ...