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In my opinion, (which doesn't count for much, I know) the 7hp Kohler Troy Bilt Horse tiller was the best tiller ever made. Those tillers lasted forever if they were taken care of. I've got one of the 8hp Kohler versions, but it's just not the same.
It's become a lot harder to find an engine to replace these engines. You'll most certainly want to go to a Briggs and Stratton dealer and have them look it up. You need a 3/4" crank, 2 7/8" long with a keyway, tapped for a bolt to hold on the pulley and reverse disc. IF you find an engine to fit, you'll likely need to have a custom throttle cable made up to replace the current one. A good small engine dealer should be able to help you.
Now for the bad news. The 7hp Kohler was a cast iron engine. Any replacement engine you find will likely be an aluminum block with a cast iron sleeve and therefore, much lighter. What this means is the balance of the tiller, from front to back, is going to be thrown off. The result is - it will be MUCH harder to pick up the rear of the tiller when you want to turn at the end of the garden. You will most likely need to either put on one of the bumpers (if you can find one to fit) or figure out a way to hang some weight on the engine. I've seen people do some creative things to get the balance back. Whatever you do, it just won't be the same as that great 7hp Kohler. I'd suggest trying to rebuild it - if possible!
You should look at the numbers AFTER the model and type number you noted in your post. The first two digits of the CODE are the year the engine was made. This looks to me like an old 5hp Briggs....old enough that it wouldn't have electronic ignition. If it has the old points and condenser, it could likely need a tune up. Electronic ignition modules or electronic ignition coils are available for this engine - see your Briggs dealer.
If you had the gas tank off, did you replace the gasket between the carb and engine block? This particular engine uses 2 (two) gaskets, not one.
By the way, you don't want to make a governor spring. It's best to use the one specifically manufactured for this particular engine or you run the risk of over-revving.
It's an old one, for sure. Best thing to do is get an owners manual, in which the belt replacement is fully explained. Basically, you'll have to find something to support the engine, take out the two bolts and bushings on the forward/reverse lever, pound out the two engine mount pins (after you loosen the retaining bolts), slide the engine forward and do you best not to chip the reverse disc. You will likely need to remove the battery mount bracket, it'll make the job easier. Also, you'll need to take off the throttle cable. Getting it back together is a barrel of laughs, you'll need some long screwdrivers to make sure the belts get into the grooves on the pulley. Put the belts on the engine pulley first and slide the engine back into place. Watch out so you don't chip that reverse disc.
In this case, the owners manual would be a big help. It should have pictures which would explain this procedure much better that I can here.
most problems are due do a fouled carb, because of old fuel most of the time, take the carb off and separate it from the tank and give it a good cleaning and replace with new gaskets and carb parts, use carb clean and air pressure to clean,