Help!!!

just bought 2 kits they both are well um uh, junk, 48cc 2stroke from ebay, I have bought them off ebay before but never this bad, does any one know what the compression should be, (psi, not finger over sparkplug hole)

ah, almost forgot, I'm suppose to introduce myself, hi I have gas, gotgas? get it?

thanks!!! did a compression test on both motors and one is at 90psi and the other 100psi. we went for a ride and the motor with weaker compression locked up