Spark plug

[andy01842]

I got a Mercury 4hp 2 stroke about 1993 and it is in need of a new spark plug, the old one is a NGK BPR7HS but I not shore if this is correct. Can any one tell me what is recommended.

Tnx Andy /forums/images/graemlins/smile.gif

 

[VicS]

I think This site will answer your question.

Otherwise try the Mercury/ Mariner forum at iBoats.com if no help is forth coming on here.

It looks like the right one (BPR7HS-10 listed)

FWIW This page explains the letters and numbers

 

[mandlmaunder]

If it works dont change ir

 

[VicS]

[ QUOTE ]
If it works dont change ir

[/ QUOTE ] He said it needed a new one. Sensible to have a spare anyway.
Also sensible to fit the correct plug. Quite apart from things like the reach if the heat rating is wrong it could either tend to foul up or burn the piston.

 

[Lakesailor]

oooh. You beat me to it. /forums/images/graemlins/grin.gif