i am just using the stock muffler, but i pulled the screens out and now all that is left is the hollow baffle with holes all in it, couldn't be too restrictive.

Ralph, i don't know which compression question you are speaking of, could you please ask it again because i can't find a question that i did not answer.

if this is the question you are referring to:

"Does it feel like it has good compression?
Can you turn it over easily by hand, or does it get real hard to turn when the piston
comes up on the compression stroke? "

i answered it in post #61 yes it gets hard to turn when the piston compresses. i would guess from experience around 60-70psi.. i don't know what it is supposed to be, but i would wager that this engine is a little low on compression.