Dad and I pulled my grandpa's old 450 to our barn today. It was parked 5 or 6 years ago. Dad said he thought because it had a knock in the engine. My uncle claimed it was because of governor surging. Dad took the left side and cleaned up the carb, I took the right side and tuned up ignition and set timing. After just a couple of hours it was running, pretty well too. Good news was, no knocking. The bad news, it surges. If it was a Cub, I would have adjusted the gov-to-carb linkage, but the bigger tractors are not the same. We played around with the carb adjustment, but didn't fix the surging. Anyone have any suggestions on things to try?
Also, I don't have a manual for it. The front pulley has 4 timing marks and I wonder what they are for. Are there multiple advances? I picked the first one and set the distributor using my multimeter. I guess that was TDC, because it started right up. Would I be correct in assuming that the last one is full advance and I can check with the timing light at full throttle on that mark?
Thanks for the help. It was a great day to spend time with Dad in the barn and then hear the old Farmall run!!