You will to disassemble the motor and take measurements as the Kohler service manual shows. Most times you will find the motor out of spec or almost out of spec. After you hone it it will be out of spec. I've know a few who tried to just hone.....work good for a year or 2-had to spend more money to do the job right. A good gasket set for your K301 is $55 to $65. Part of my rebuilding process is taking measurements before and after machine work is done to block. This includes new part(s) like a connecting rod.
Parts you will need to rebuild a K301 the right way are:
piston and rings
conncting rod
gasket set
governor gear-if your current one is plastic(should be plastic)
points plunger rod
points and condensor
spark plug wire
spark plug
new head bolts
valves-depending on wear
valve guides-depending on wear
Machining work that needs done:
bore cylinder
grind valves-if they are serviceable
crank journal may need turned
You can't ordered connecting rod, piston and rings until you take measurements of the cylinder and crank.
The carbon didn't cause the marks on the piston in metalrain's post. That is the hottest area in the combustion chamber. That piston is melted because of heat.
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