1999 Johnson 15HP Upgrade

[Calibra]

Hi

I have a fully rebuilt Johnson 2 Stoke, 1999 15 HP engine.
It runs real well with very good compression.

Is there anything that can be done to the engine to increase bhp/power?

My mates who have newer 20HP 4 Stoke engines have that little bit more performance out of their boat.

James

 

[boobie]

You could try to do some re-proping Otherwise get a newer motor.

 

[thumbnut]

First things first. Get a tiny tach or equivalent, Find rpm at wot. Go from there.

What boat ya got?

 

[raczekp1]

boysen power reeds can increase some rpm

 

[thatone123]

I have fooled around with these 15's a lot. In the mid 80's they actually made a 7000 rpm model that hardly anyone seems to know exist. I think that made it for class racing in the upper mid-west. I have tried to index the plugs. Take off the airbox on the carb to try to get some cooler air into the carb. A 2 blade prop that OMC used to make helps. Pretty simple stuff for maybe a small hp gain.

 

[thumbnut]

http://www.apba.org/sites/all/files/...%20rules_0.pdf

here is some stuff ya might like on the omc 13.2 page 10 is interesting

 

[thatone123]

WOW, that Is a anal retentive AH's dream...It would keep me out of the running or even wanting to run!!!