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Farmall & IHC Tractors Discussion Board |
Re: Whats the difference?
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Posted by RAW in IA on June 02, 2005 at 17:03:13 from (12.219.45.39):
In Reply to: Whats the difference? posted by Lane on June 02, 2005 at 16:27:42:
The different numbers denote different heat ranges opf plugs. the 15Y is the coldest, and should probably be used only fi the tractor is being used for hard pulling for an extended period. The hotter ones (21Y) are best for lighter use, or limited hard pulling. The tips stay hotter and keep the oil deposits burned off better, will not foul as quick under extended light use.
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