I got the new head gasket installed on the TRA10d Wisconsin in my 1054. It fired up on the second try, ran ok, but blowing a lot of black smoke and working the throttle had no effect on the engine speed. I started screwing in the main jet a bit at a time and it started running better. I finally got it to where it was running great at full throttle, idling smooth at min throttle and would pick the front wheels off the ground if I let the clutch out too fast at full throttle, 3rd low. The problem is that it runs great for an hour or so, then the engine starts so stumble, almost like it is out of gas, then just quits and won't restart. I let it sit for about an hour after the first time, then it started back up and ran fine for about another hour, then quit again. I am going out in a few minutes to see if it will start again. Anyone have any ideas what is causing this?