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Help need head id

G

ged

Forum Mentor
Past Site Supporter
Just purchased a head and was told it was for 1980 - 1983 GS850. When I received it I discovered the carb sync screws are part of the head and not attached to the carb boots.

Can anyone identify this head please :confused:







 
It's an 750/850 head. Has threaded bosses by the cam chain tunnel. Not sure if it's an early or late head though. You need to measure the intake port size.

Edit: Sync ports in the head means it's a '79.
 
Last edited:
Nessism said:
It's an 750/850 head. Has threaded bosses by the cam chain tunnel. Not sure if it's an early or late head though. You need to measure the intake port size.

Edit: Sync ports in the head means it's a '79.
Click to expand...

Hope you are right, purchased it for the exhaust valves. 79 & 80 GS750/850 valves are the same part number. The difference between the 79 & 80 would be the different carbs. I am thinking you are correct.

landshark said:
My '80 1000G head has the same sync screws mate.
Click to expand...

Mate hope you are wrong because valves are different part numbers.

tkent02 said:
What's up with the #4 exhaust valve?
Click to expand...

Just took out exhaust valve to compare with my old ones. They appear to measure the same. Only difference I think is a star shape beside the S & EX.





Flyboy said:
So does my '81
Click to expand...

Hope not, I have fitted the valves and they all appear to fit correctly. All after a light valve face grind.
 
Thats a mitsubishi symbol.
If its no good for you and it is a 1000 head i might be interested.
 
I also would say that it looks like a '79 750/850 head. Do your '80-up intake manifolds fit? ;)
 
Thanks all for your input, I think I would put my money on it as being a 1979 GS850 head. I can use all the valves as they didnt change throughout the years of the 850 only the head where the carb boots attach to the manifold.
 
Steve is correct, that is not a 1000 head, my head does not have the threaded bosses for the idle gear either.
Pretty certain in is a '79 750/850 head.
 
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