I have a K341 that has been giving me problems for about two years now. It came on a snapper 1650. It would start and idle fine but when reved up it would make the front of the tractor jump around. I pulled it apart and removed the balance gears and reassembled it. It did fine for a few test runs and then started the jumping again. I took it apart again determined to find the problem.
The first thing I found was that the flywheel key had sheared. I guess I installed it wrong.
Next I decided to get the tools and start measuring everything. The piston is on the edge of being at the max wear limit. The cylinder has no ridge around the top and looks good but I didnt have a way to measure it.
I finally broke down and got some bore gauges. I had some trouble getting repeatble readings with them. I decided to drop the piston in the bore, that way I could have atleast one solid plane that I didnt have to feel for. I started to get consitant results that way. The preliminary measurements werre all in the 3.748 to 3.750 range. Now I have not seriously sat down and measured, I only had few minutes today and it wont be until saturday before I get any time.
I am looking for tips and tricks to get good measurements on the bore. I am trying figure out if it needs to be bored over or not.
I have the HF dial and digital calipers and the telescoping bore gauges.I also have a set of cheap mics but they dont go big enough for the bore.