Home › Forum › Ask A Member › HELP– Do I have the Holly Grail–New Old stock 1986 Johnson 15 HP › Re: HELP– Do I have the Holly Grail–New Old stock 1986 Johnson 15 HP
October 16, 2017 at 4:39 pm
#66278
When you change that impeller, I recommend getting a Johnson impeller rather than the aftermarket Sierra impeller. I use Sierra impellers all the time, but in three 15 HP Johnsons of similar year to yours, I found they did not cool at slow trolling RPMs and factory Johnsons impellers did. it’s the only Sierra impeller application I’ve had trouble with.
Dave