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  #1  
Old 06-05-2018, 01:04 PM
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bllwnkl bllwnkl is offline
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Default (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?
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Old 06-05-2018, 01:07 PM
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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.
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Old 06-05-2018, 01:18 PM
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Heres a little chart.
Attached Images
File Type: jpg engine-lean.jpg (24.5 KB, 175 views)
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Old 06-05-2018, 01:45 PM
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Quote:
Originally Posted by olds45512 View Post
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.
Good one!
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Old 06-05-2018, 01:50 PM
J-Mech J-Mech is offline
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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.
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Old 06-05-2018, 01:51 PM
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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.
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Old 06-05-2018, 01:57 PM
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Quote:
Originally Posted by J-Mech View Post
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.
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.
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Old 06-05-2018, 02:26 PM
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Here's the plug. Without cleaning it, the gap is .030.

spark plug cub (387x450).jpg
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Old 06-05-2018, 02:41 PM
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Here's some info on reading the spark plug.

http://www.ngksparkplugs.com/about-n...d-a-spark-plug
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Old 06-05-2018, 02:47 PM
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Originally Posted by olds45512 View Post
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.
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