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Mikuni RS36 carbs on a 502cc GS425 too big? WERA or AHRMA??? vs CR31/33

750/850 2v pistons use a smaller wrist pin, later 750 use correct wrist pin but are 4v. 1000 2v uses correct wrist pin but I have no idea on dome shape and valve pockets are likely not quite correct. 1000 has a much longer stroke so 10.25:1 compression pistons might yield 9:1 compression if you're lucky. Could mill head and block for a slight bump.

I'm curious now if the 1000 pistons would work...
 
Chuck78 said:
750/850 2v pistons use a smaller wrist pin, later 750 use correct wrist pin but are 4v. 1000 2v uses correct wrist pin but I have no idea on dome shape and valve pockets are likely not quite correct. 1000 has a much longer stroke so 10.25:1 compression pistons might yield 9:1 compression if you're lucky. Could mill head and block for a slight bump.

I'm curious now if the 1000 pistons would work...
Click to expand...
Just an FYI. GS400/425 shares the components with the 77-79 GS750. 16mm wrist pins and valves are the same. GS400 and GS750 use the same pistons. GS1000 and GS450/500 use 18mm wrist pins. Dar
 
Yes. And Wiseco 844cc GS750 pistons make a 10.5:1 449cc GS400/425. A great budget build
 
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