Did a Google search
Now this I don`t understand 2000 135 HP Opti takes NGK plug PZFR5F-11 Searching the web marine dealers any where from $9.13 to $13.57.
The Honda 3.5 engine uses Platinum NGK PZFR5F-11 for a price of $1.72 ??????????????????????????? Duh I have no clue…………………….Any one explain ???????