Kohler K321aqs running hot.

[hlw49]

Overly retarded timing reduces power and causes high exhaust temperatures, making exhaust manifolds glow red as the heat that the engine failed to convert into energy goes out of the exhaust, often with the fuel still burning. He was complaining about the muffler glowing red. Just that retarted ignition will cause the exhaust system to run hot ie the exhaust valve and muffler area. Thus said neither overly advanced or retarted ignition timming is good.

 

[SeniorCitizen]

A mouse nest is inhibiting air flow across the head .

You lapped the valves and didn't clean the compound away good enough ? If that happens they will need rings within 30 min. of operation .

Timing can be checked with a helper to crank . With the plug out and grounded and your thumb/finger pressing on the spark plug , hole helper cranks and you'll see spark and your thumb or finger will be blown of the hole at exactly the same time .