I'm looking at a VZ250 with 300hr. for sale locally and plan to order hydro tec mods. The engine has 100 psi on 1,2,4,5,6 and 105 psi on 3. All I can find on compression. As long as they are within 10% of each cylinder. No minimum compression numbers. That was from Yamaha tech support. The engine runs good. Thanks in advance.