Posted by Bob M on February 11, 2010 at 11:43:28 from (151.190.254.108):
In Reply to: Best plug for H posted by ryanwheelock on February 11, 2010 at 11:12:37:
Ryan - A hotter plug will definitely help reduce the oil fouling.
For Champion, higher numbers = a hotter plug. For an H my recommendation is use a D21 - or even a D23 if you can find 'em.
Note that even after a rebuild and your engine no longer burns oil, unless you work the tractor HARD you will have best luck with the D21 or the Autolite heat range equivalent (386 or 3116?).
Reason: The lousy gas we get now seems to have a propensity to foul plugs in lightly loaded, carburetor-equipped engines.
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I wouldn't bother with those "fires in oil" plug adapters that fit between the wire and the plug terminal. They may solve the problem for the moment. But you'll find the plugs will still foul and misfire after another hour or two of running. They also seem make the rest of the ignition system more prone to shorting/misfiring problems, especially under wet conditions.
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