I was letting it run at fast idle, about 1/4 throttle to wide open with blades turning to put a load on it. I would cut grass while it's running to put more load on it but if it dies away from the shop it's very hard to get back to the shop. cpurvis, I'm at a loss to. I use my backhoe to get it back to the shop but it blew a hydraulic hose 2 days ago and its in the boom. I don't know how hard it will be to line up piston end back in boom to put pin back in.