Low compression after rebuild?

[Live2Ride250R]

This is about an 86 YZ250. My brother just had the cylinder bored .10 over, he installed a wiseco piston, rings, new gaskets etc. Well after the break in period we checked the compression and its at 145 psi, I was expecting around 180 or so. What do you guys think? Time for a leak down test?

[Banshee]

I always like to do a leak down test before firing the beast. What is the compression supposed to be do you know? 145psi sounds pretty decent for a single cylinder 250. But I'm not sure.