cqaigy2
Super Member
That's what i ended up doing. Bought a Kohler, but the shaft was larger than the Robins, then i found another Kohler, after i put mine in, that had same size diameter shaft as the Robins engine. I talked with Terry and he sold me a "kit" that i used some of the parts out of, to adapt the Kohler. Stepped me up a couple HP, and less noisy. Probably the best upgrade ive done to the 422.For me, I would put a 25 hp Kohler in it and be done with it. no big deal. They would have the same pumps as the same age 425. Take a couple of pics of the engine and the pump set up....... Guys on here can help you get the right engine...... Jim