Hi everyone, I have a 5hp(maybe 3 1/2) B&S on a Homelite water pump. It's a horizontal shaft motor with a tank mounted carb. I can get the motor to run, but it won't run under load. As soon as you put it under load, it will die off within a few seconds. I lost the original governor spring, so I had to replace it. I got a new one at Napa. The governor moves freely, so I don't think that's a problem. I've tried cleaning out the carb several times, and it still does the same thing. I did a compression test and it barely reached 50psi, so I thought it was the rings. I replaced the rings and now it has good compression, but it still does the same thing. I've tried everything I can think of. What's left?