Spark Plugs

markkay19

Cadet
Joined
May 11, 2003
Messages
8
hey, please could you tell me the correct N.G.K spark pluggs to use in a Jhonson Sea Horse 4 HP
 

Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: Spark Plugs

Depends on the model number (off your transom bracket), but if it takes Champion J6J or J6C's (like a 1970 engine) than NGK recommends the B6S. <br />B = 14mm thread<br />6 = heat range (coincedence on it hitting the Champ no., NGK's scale is backwards from Champ's)<br />S = 3/8" reach.<br />I know some folks here recommend Champions in Johnson/Evinrudes. I'm currently running the B6S's and have yet to decide.<br />PS - a B7S may be a better match but I can't find them. Lot's of B7HS but they have a 1/2" reach (thread length)
 

zzzzz

Lieutenant Junior Grade
Joined
Jan 13, 2003
Messages
1,094
Re: Spark Plugs

mark- i don't know why but OMC products are notorious for disliking NGK plugs....they much prefer Champions...again, i don't know why but i do know it's true :eek:
 
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