The standard reed cage system was not used on this bike
Another view of the reed cage
The engine number  430-1
The cases on the works Husqvarna's were very different than the later production models.
The crank cases were originally manufactured in a magnisium alloy but those cracked.
The "S" was stamped into the fork leg to designate "Special"
The standard cylinder head was used but the spark plug was repositioned further right.
The special hub designed to address the issue of spokes breaking with the standard hub.
Special construction front hub
Special hub, pre-series production
Frame number HMUL 430-1.  HMUL stands for "Husqvarna Motorcyklar Utvecklings Laboratoriet.  In english
"Husqvarna Motorcycles Developement Laboratory"
6mm mounting screws for the sprocket.  The production models were changed to 8mm
Gunner gasser throttle and Magura controls
1979 Husqvarna 430
                    Ex Chuck Sun Ride
Featured here is Chuck Sun's 1979 Husqvarna owned by
Sven Åke Engstrom.  Sven Åke worked at Husqvarna for
many years in the R&D Department. He was kind enough
to share these photos of Chuck's GP bike.

Chuck Sun had two bikes at his disposal which were built
specially for him to be used in the GP races in 1979 and this
is one of those bikes. Chuck rode on these bikes until the
summer when he went back to US. During his stay in US he
got an injury which made him unable to finish the GP season.
He also broke his hand in Lommel early that spring and struggled getting well during the preseason so he had a
tough year 1979.

Thanks again Sven Åke!