OK i give up! I just bought this 1978 rear tine tiller with the hopes it would last me longer than a new one.The things built like a Sherman tank.Well all except they replaced the motor that came on it with a 5 hrs power. Plenty of power but the problem is you cant hold the sucker back.(I thought that was the purpose for a rear tine?So you didn't have to fight with it!) As soon as it gets a bite on the ground, it jumps forward and theres no holding it back at all.No i don't mean it just jumps a little.I'm mean you have to almost run to keep up! (It is not usable at all like this!) Front tine tillers have the little rod in back to get them to slow down and dig.This thing has a rod similar but it is designed to just slide across the ground not dig it.It just rides across the top of the ground to stop it from digging deeper. OK so what, you only supposed to dig one inch deep per pass?Cause if you let it down more its gone!The wheels cant hold it back if there not touching the ground for ten feet! Somethings wrong here but i cant put my finger on it.Unless maybe the 5 hp engine is turning more RMPs than what ever came on.Usually about 8 or 9 hp i think for its age.But it doesn't look to be turning that fast really. Any ideas? My back hurts so i cant play with it anymore today.Plus it just spat its key way out at me from the belt drive.I just love well used toys.