user 21074
Well-known member
- Joined
- May 12, 2016
- Messages
- 110
- Reaction score
- 0
I have a 1985 Johnson 20 hp converted to 30hp.I did have it as a 25 for awhile With an intake swap and found the parts needed to go to 30hp.Prior to conversions I was running approximately 6k according to tiny tach I finally put on.I new it seemed high just by ear.Repiched prop from 11 to 13 and running about 5500 to 5600 as a 30 hp.According to specs I believe 5500 is WOT unless I got wrong info?How detrimental is it to run at higher rpms if I decide to maybe go back to a little higher rpms?