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1975 mercury 7.5 hp spark plugs.

Roberth101

New member
I just purchased a 7.5 hp mercury outboard for $100.00 i know it runs as i seen it 2 days before i purchased it. Before I run it i want to change the plugs. It has AC plugs in it now. Plug number v40ffk. I went to my local Napa and asked for autolite plugs and after them looking them up they gave me part # 2852. After i got home i looked up the factory installed plugs and cross referanced them to an autolite 2872. Is the 2852 compatable with the 2872? What is the differance in them?
 
You got me. Those motors use a gap less plug, which are not sensitive to heat ranges. Make sure the thread length is correct and you're okay.

Most people prefer NGK.

Jeff
 
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