What was the max RPM Tote Gote's with the Climbaway clutch ran from the factory? I have two Tote Gote Nova's. One is a 670 I put a 7hp Tecumseh engine on, the other is a unmolested, well-preserved, 675 with the stock 6hp Briggs aluminum engine. Both run the same 1" shaft Climbaway clutch made by...