I pulled the engine (Kohler K341) out of my garden tractor to rebuild before spring. It burned enough oil to keep the mosquitos down and leaked from about every gasket.

How to measure cylinder borewithout aboregauge

I know the ridge will affect the measurement when using a caliper. Is it worth spending $50ish for an actual cylinder bore gauge or should I just go with my original plan and use a ball hone and put a standard size piston in? This was supposed to be the parts tractor but I haven't figured out the governor issue on the other one so I have been using it for mowing.

Cylinder bore sizechart

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How to measure cylinder size

specifies electromagnetic compatibility (EMC) requirements for power drive systems (PDSs). A PDS is defined in 3.1. These are adjustable speed a.c. or d.c. motor drives. Requirements are stated for PDSs with converter input and/or output voltages (line-to-line voltage), up to 35 kV a.c. r.m.s.

How to measure cylinder borewith caliper

I measured the cylinder bore with a caliper to see if I need to get it bored for an OS piston, the standard bore is 3.75 and I measured 3.745. There is a slight ridge at the top of the cylinder, I can feel it with my fingernail but I don't know if I would say it "catches" my fingernail. This is my first full engine rebuild so my fingernails aren't calibrated.

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clean the cylinder measure the bore at the top with what ever you have. Then take a ring and install it at the top of the bore where tge cylinder is not worn keeping it square to the bore with a piston that has the rings removed and measure the gap in ring with a feeler gauge. Then slide the ring down the bore with the piston and measure the gap at the top where you can see ware and at the middle and the bottom. The variance in the gap from your initial gap is the ware on the cylinder. This is by no means perfect and will not tell you if it I out of round but it is a good starting point. I have used the for many many rebuilds of lawn mowers as well as SBCs. Far from perfect but way better than nothing.