I have an early 317 with the series 1 KT17 engine. My tractor has a little over 900 hours on her now and during the first 20-30 seconds of the first start up it smokes then stops and only smokes when she's under a load like mowing tall grass. My question is.. Is it worth rebuilding the series 1 KT17 engine or should I look for a different engine all together? I don't mow on any hills my land is fairly flat. I would save more money just rebuilding the one in the tractor right? Any help would be great!!