1986 Evinrude 90hp

[eula30]

Hi, I have a 1986 Evinrude 90hp, motor is running at 5000 rpm max. Is there any way to know what is the max rpm for this motor? Also any idea what is the sparks plugs model number for a Johnson 1983 15HP? I will really appreciated any help.<br />Thank you

 

[ob]

Re: 1986 Evinrude 90hp

Prop the 86' 90 hp to turn between 5500 and 5800 rpm at WOT.<br /><br />The 83' 15 hp engine takes Champion QL77JC4 plugs gapped at .030" or L78V surface gap plugs for sustained high speed application.