I need to find the spark plugs for a 25 HP Evinrude Aquasonic. I believe it is early 70s late 60s.?

Question

I found the serial number 25926-08528 hope someone can help

Answer 1

Try contacting Evinrude, or a marine repair store.

Answer 2

go to a marine store that sells plugs tell them you want to by a set and heres the serial number or call a evenrude dealer im sure they will give you the right answer  as long as you have the serial number your going to get them dam plugs

Answer 3

use only Champion QL77JC4.   L77JC4 would work for you if it's a 60's motor -- the Q is a radio interference suppression plug and works better on electronic ignition motors.

If champs aren't available, go with the AC equivalent -- the NGK equivalent isn't an exact match for heat range.

Gap 'em at .030 but if you do a lot of trolling, bumping it out to .040 will help cut down on oil fouling.