Spark plug
When should I replace a spark plug? Thinking about preventative maintenance on my 147 before winter. The current one is about 4 years old and still works fine. How to know/when to replace?
Thanks
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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