I have a 26 HP, 54" cut Craftsman riding mower. When I step on the accelerator all the way the mower wont go, or goes very slow. When I let up from the fully depressed position then it will go faster, but still not as fast as it should. I think top speed for my mower is supposed to be 6mph, but it only goes about 4 in the semi depressed position. Reverse works fine.. I tried to do the "purge" thing I found in the manual that came with it just to see if that was the problem. It didn't fix the problem. Belts seem ok.. Mower is about 4 years old, and this started last season. Any thoughts would be greatly appreciate as the difference between 4 and 6 mph is about 45 minutes for my yard
Side note: My yard is on a major hill so I'm sure that doesn't help the inner workings of the mower. Thanks in advance 