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Intake/Exhaust Valve Diameter GS 750/850/1000 2 valve heads...

tkent02

tkent02

Forum LongTimer
Past Site Supporter
Putting 850 cylinders on a 750...
Trying to figure out which head to use, are the valve diameters and ports the same on the three heads? How about combustion chamber volumes?
Thanks,
Tom
 
Use a 1980 or newer 850 head. this particular head has intake ports designed for 32mm CV carbs. The other important features of the head are the same as a 2 valve 750, so you'll have less work to do to make the swap work.

Terry
 
Except I don't have any 32mm CV carbs.....

Except I don't have any 32mm CV carbs.....

Just going to use the regular '78 GS 750 carbs, should be much easier to get the jetting right...I guess the 750 and 850 have the same part numbers for heads and valves, so I'll just use whichever one is in the best shape...
And the other one is for sale.
 
With the bigger bore the 750 head will have more compression.
 
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