why is it everyone proclaims how they know their way around these engines but then go and pump up the crankcase to find a cooling system problem
6psi most likely wont be enough to detect a leak in the cooling section, thats if you werent too stupid to leave the piston above the ports, like i said before. if there is some kind of leak then chances are you wont know if its in the head, crank seals, reed area or mating surfaces of the crankcase.
by pressuring the system at the radiator youve isolated the test to only the cooling system, as thats where your trying to test for leaks. FFS
pump it to 15psi and wait a minute or so. if theres no drop your good. if it drops youll either see evidence on the exterior somewhere, otherwise it will be on the interior which meens the inner oring. pull the head and replace orings. DONE
this is just common sense shit a kid could understand