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Where are the 8 valve 750 folks?

  • Thread starter Thread starter slow_heavy_750
  • Start date Start date
1977 gs 750b

1977 gs 750b

Can all of the 750 2v heads be bored to 850? If im understanding this all i would need are pistons and rings? How far over is that?
 
Don't have time to read ALL of this thread right now but,
when I made my 750 into an 850 in 1981, it was painless except for the fact that the Dealer told me that it couldn't be done! LMAO!!!
Also, if you use the 750 head, the combustion chamber is smaller and will help in boosting the compression ratio. ;)
Just like when I used the '81 850 head on my Wiseco piston kit in my 1000. More compression.

Eric :)
 
67fire said:
Don't have time to read ALL of this thread right now but,
when I made my 750 into an 850 in 1981, it was painless except for the fact that the Dealer told me that it couldn't be done! LMAO!!!
Also, if you use the 750 head, the combustion chamber is smaller and will help in boosting the compression ratio. ;)
Just like when I used the '81 850 head on my Wiseco piston kit in my 1000. More compression.

Eric :)
Click to expand...
The combustion chamber size of GS750 & GS850 motors are the same size. 1979 cylinder heads have the same part #11100-45820 for both 750/850 engines. After 1979 there were no more 8-valve GS750's. All years GS850's use the same pistons #12111-45110. If you are going to use your 8-valve GS750 carbs then just use your 750 head. If you are switching to CV carbs then you need to use a 80-83 GS850 head with the large intake ports.
 
I stand corrected on the 750 and 850 heads.

The first one is a '79 750...

DSC02053.jpg


This one, is an '81 850 head that had a misunderstanding when the timing chain no longer wished to participate...

DSC02054.jpg


As can be seen by the carbon build-up, it was on a 1000 cylinder and block.
Thus, more compression. ;)

Eric :)
 
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