I only run the 93 because thats what it says in the manual on page 10. run 93 or no less than 91. I dont know how much my head is shaved because I did it myself buy hand but I had to take quite a bit off to make it flat. Now it looks like Im in for a top end rebuild so when I order the parts Im going to get a new head and restore the factory compresion. I belive it to be a little high now for when Im starting it up it seems to slip the SG belt a little at the top of the stroke. Thanks SEAFOAM!
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