Larger Valves for 81 650 head

[Nessism]

do you know where i can find the valve dimensions for the larger gs models?

In the various service manuals. You can download from Basscliff's website.

[ashdricky]

In the various service manuals. You can download from Basscliff's website.

I was able to find certain valve specs but I want to compare the diameter of the 650,750,850 valves

[TeamDar]

750 and 850 valves are the same.

[Nessism]

I was able to find certain valve specs but I want to compare the diameter of the 650,750,850 valves

The diameters are in the service manual. Look in the service specification table.

[TeamDar]

750/850 are 36mm intake and 30mm exhaust.

[koolaid_kid]

You also need to know the valve length and where the keepers sit on the valves. I had my GPz head done by a fellow in Alexandria Ohio called Pearson Racing. I had my head milled somewhere else, but he went through the head completely doing a valve job. Some of the things he did were make custom valves from SS blanks, checked all the valve guides,fitted with my cams and pre-shimmed, checked for Wiseco piston clearance, etc. Pretty much everything but a porting job. Sure it was expensive. But it screams, is 100 pounds lighter than my 1100E, and is a blast to ride. In fact, I enjoy riding it more than the GS.
Different strokes for different folks.