Plugs for a 90 HP Johnson

[Brian F]

Any idea what spark plugs I'd need for a 90 HP Johnson?

[Terry/JNR]

Champion QL82YC is the recommended replacement. If you only do WOT running and want to use a colder plug use the QL78YC.

[clueless]

depending on what year it is,but i have a 90 evinrude,a 1994 model year,and it takes QL77JC4 or L77JC4.

[John from Illinois]

Those are all correct plugs for a 90 Johnson and, there are a few others too. But if you put those QLxxYC plugs in a cross-flow (which is designed for the QL77JC4), the piston is gonna' hit the plug. How about a model number so we can id this motor and stop guessing??

-John