I was going to stay out of this (its not my inclination to get up in other's business) but simply put eds information about crank balance is accurate. (no the sleeve is not part of the equation. He knows this and knowing Ed it was just the way he wrote it)(I struggled with the way ed wrote things in the beginning to and took things wrong but after meeting him I can tell you he is nothing like the way some have portrayed him. Its just his writing style) I like a percentage a little higher than his but generally you want the the piston weight, pin, clips and a percentage of the rod mass to balance the crank counterweight at a 90 degree angle. making a suitable bob weight will get you there. what you are actually trying to achieve is an equal or slightly offset vibration in the horizontal and vertical plane. slightly more or less vibration in one plane or the other can be usefull or can seriously upset the fuel flow through the engine. I have seen a marine .90 engine that was so bad out of balance from the manufacturer that it literally hit an rpm wall and would rev no further untill we rearranged the balance of the engine.

again eds information was accurate enough to get his jist. If you want to pick fly shit out of the pepper go find the information yourself.

thats how I feel about it.