I just got a f525 1998 deere front mower with a 17hp Kawasaki. it has 1000 hrs on it. It seems like it is very slow. Are these tractors slow? When I put the pto on the engine bogs down to almost a stall. Is this normal? It also is hard to start when it is cold. i have a 14hp and it neede new valves, and now it starts right up, but it was a 1985 160. Any help would be great.