Re: SH D-21 spark plugs

Posted by Bob M on January 07, 2004 at 13:10:36 from (165.170.128.65):

In Reply to: SH D-21 spark plugs posted by Red Ed on January 07, 2004 at 12:57:00:

Whoever sold you those plugs doesn't understand heat range charts!! For Champion higher numbers = hotter. I believe the same applies with AC, Autolite, etc.

A hotter plug will not directly improve cold weather starting. However a hotter plug is less likely to foul - especially under light load and when running poor fuel. And having the plugs free of any fouling greatly improves cold starting performance.

Note: I switched from D-17 to D-21 in both my SH and SM. Have not had any plug-related problems since making the switch - 6 or 7 years now...

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