(Another) Dumb Question
 

I've read over and over on many different posts about air leaks in your carb or having the wrong carb adjustments making the engine run lean can cause overheating.
The dumb question is, if the tractor seems to be running great, how do you know if it is running lean? :Huh:

Pull the spark plug and post a pic of it. Obviously the pic you post need to be of the end that goes in the engine.

Heres a little chart.

:ROTF2: Good one!

Adjust it until it blows smoke on a quick rev, then back it off just a little. Rich is better than lean on an air cooled motor. Obviously, you don't want it so rich it carbons the combustion chamber with coal black soot... but it needs to be on the rich side.

See, sometimes you just overlook the obvious. I'll pull the spark plug and post a pic of the end that goes into the engine. :biggrin2:

Thanks, that's what I want. It really runs great for 1 3/4 hours solid. Then acts like it's starving for fuel. I've been tweaking a new carburetor.

Here's the plug. Without cleaning it, the gap is .030.

Attachment 93335

Here's some info on reading the spark plug.

http://www.ngksparkplugs.com/about-n...d-a-spark-plug

Thanks, I appreciate it. My spark plug looks normal to me.