Craftsman mower with 26hp kohler smokes

needle and seat not closing of properly and allowing fuel to leak out
check for excessive sump oil level

check and clean area around governor lever, check for free movement, press the helpful button and check link below
Small Engine Repair How to Adjust the Mechanical Governor on Kohler Twin...

theres a filler plug on the back of transmission and chang filter to

Head gasket blown. This is a very common issue with these V twin Kohler engines. There is a kit you can order from Kohler that includes gaskets and new improved head bolts. Simple hand tools is all that is needed. You will need an inch pound torque wrench. Torque specs are included in the kit.

Could be many things. Are you using multi viscosity oil instead of sae 30? Small engines will consume multi viscosity oil. Were you mowing or driving on a hillside when this happened? Is the oil level over the full mark? Could be worn piston rings, worn valve guides also.

Hi, first check the oil. If it smells like fuel, change the oil. Secondly if oil smells ok, check the valve clearances and adjust if incorrect. Let me know if the oil smells like fuel and I will help with a fix to stop it happening again. Regards Phil.

You've changed the plugs have you checked the oil and air filter if not you need to because if not it might need changed and it may be low the rider my father gave me ran ruff and would die in 5th gear and I changed the oil and air filter now it stays going in all gears.So my suggestion to you is to to change the oil and air filter I am not a pro but I have had to keep my mowers going no help from anyone so I had to learn so if you don't agree with me check with a repairman.

Most likely you have a blown head gasket,check the fuel pump to see if oil is coming out of it or the line to it is fill with oil.If this is the case replace the headgasket.

it sound like you put to much oil in it.if not check vent valve

what happens is the oil gets into the valves which will come out the exhaust when on level ground after a side to side or going straight down because the valve's are in the front of engine which is pointing to the front of mower you wont hurt the engine if it does that i would just check the oil often to make sure it doesn't run out