Hi, I've been searching the internet for two weeks trying to solve a problem I am having with my old Troy-bilt horse. I bought this this tiller on cl and paid $200.00 for it. I have become almost obsessed with this old tiller. Its probably a 1974, it has the hh60 engine. I love the idea of being able to take this 39 year old tiller and keep it running. The tiller is in actualy pretty good condition. It has some obvious leaks around the gear box and and axle around both wheels. It has the electric start which fires it up in 2 to 3 attempts every time. My problem is this. The engine seems to run very strong, when I go to start tilling the engine will bog down and some time cut out when I try to till half way down the drag bar on already broken ground. I can see the governor working. I guess my question is, Is this engine simply worn out? The previous owner just had a tune up before I bought it (at least thats what he said). Does this sound like a wore out engine or simple carb adjustment. Thanks in advance.