I have resurrected an older Craftsman 13 hp tractor and the engine runs great. I also had to put most of the mowing deck together to get it to cut grass. When I cut tall grass, most of the time the mowing deck looses power and slows drastically but the engine doesn't labor at all. So, I have something going with the mowing deck. In light grass, the mower does fine. Is there something I can do to get the tractor to mow better? I do drive the tractor slow but it really doesn't help that much. I've borrowed a neighbors Craftsman tractor that has more horsepower and it has no problem at all cutting tall grass but, like I said, the engine on mine doesn't labor, it's just the mowing deck that gets bogged. New Craftsman blades, new spindles...any suggestions? Thank you.