I picked this up from a friend after my old craftsman pump blew up have has it for about 18 months Pump started to make alot of noise ran but stopped pumping 2 broken rods and the crank is toast After looking up parts it would have cost more to rebuild it So went to Harbor Freights and picked up there Cast Iron v-Twin 5 hp Pump because my Electric motor said it was a 5 hp, I did the Math 14.5 Pump Pulley so i got a 4.25 Drive Pulley 3450rpm motor to turn the pump at 1011 rpm max is 1050rpm I was impressed with how fast it pumped the tanks full (i Still have the other 60 gallon tank) BUT only made it to 135psi in both tanks about 3 minutes then it stopped so i turned the PSI up to 150 that's where is want it let some air out so it would turn back on but the electric motor would not start has power every where but the motor would not run so i took it apart it was dirty inside there with Paint must have used at a body shop I cleaned everything inside looks like new motor still would not start used a hammer and tapped on the motor when i got back to the thermal switch it started sounded like the front bearing was bad so i went and got new ones replace them both the guy at the motor shop said that my thermal switch is an old stile i have to hold it in until it clicks he was right he said that I might have to under drive the Pump because the Electric motor is not a real 5 hp it's Marked SPL The motor is Overheating pops the thermal so i took his advice and install a 3.5 drive pulley to under drive it The motor gets hot but does not pop the thermal so i have been looking for a real 5hp motor maybe even a 6.4hp there are so many new motors out there to choose from i can't find any of them with good reviews most are good and bad in the same review makes you wonder, Any ideas?

I have my eye on a WEG 00636OS1XCD182/4Y 6.4hp 3450 rpm 23 fl amps I can't find anything bad about them, So far looks like a motor that will work good for the New pump, What do you think?

Let you know i bought that 6.4 Weg Motor Installed it today so far Very good with the new pump I'm very impressed on how fast it can go from 0psi to 160psi About 4 mins in 120 Gallon tank