I bought a boat with a 2002 90 hp merc. I thought. I cn not find any reference to a 4 cyl, just 3 and 6. There is no serial number tag. Is there any other way to determine what I have?
Open the hood, there is a tag on the block near the heads on the left side. The factory serial number tag is on the mount on the right side near the transom bolts.
My 2003 75 HP merc is a three cylinder, the 90 HP is the same motor.