I just recently bought a 1973 FX. I was told by the seller that his Father whom he got the bike from, had installed low compression pistons for easier kick start. My question is..what kind of compression should I be getting if this is true. I am getting 73psi both front and rear cold and about the same wet. This bike fires right up first or second kick after a couple primes. Doesn't seem to smoke cold, idles nice and do not notice any odd eng noise. Haven't ridden it yet, need to do some brake work and check out the sticky clutch plates and all the other stuff that needs to be done to a bike that's been sitting.