What do I have

[Guest]

Hi wise-ones,

I've been given a head that looks identical (twin cam, 2 valves per cylinder) to the head off my 1979 GS1000S. The difference is in the inlet tract diameters.

On my GS the internal diameter of the inlet tracts in the head itself is pretty close to 28mm, while this head I have been given has bigger tracts: 32mm.

Which model(s) is this head from? What type of carbys did it run? Could I make it work on my '79 GS?

Thanks
Ian

[Steve]

Sounds like you have a head from an '80 or newer bike.

They had CV-type carbs that were larger in diameter.

.

[sharpy]

Has it the extra hole for a bolt at the front of the head. Still silver or is it black with D-shaped exhaust ports?

[IanR]

I measured again and mine is 34mm. I read that excellent how to document on how to rebuild CV carbs and it looks like I've got a head from an early 80s model. Now my dilemma is: do I source a set of CV carbs to suit.

Life's full of intriguing questions. Thanks for helping me out.

Ian