I just got this tractor and have little experience with Yanmars. It has a 3 cyl engine, #3T72HA. It has not been run in 2 years. I drained the fuel tank, changed fuel filter, charged the battery,and tried to start it. It finally started after a bit of coaxing, but has no speed control. The linkage seems OK-it all moves all the way to the injector pump, and the arm on the pump also moves. The engine just revs and revs, until I slow it down with the comp release, and finally that's how I have to stop it. I took off the cover on the injector pump and looked inside and see a couple of parts moving when moving the shaft. I need help to figure out how to control the speed of this engine. THANKS