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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Anybody here know 1980s Johnson outboards?
So now that I have a 4.5 HP outboard that runs well I would like to
hop it up a little. My last outboard was a 10 HP Merc. I liked the power. I'm pretty sure the 4.5 HP Johnson will leave me a little underwhelmed. So I'm thinking about hopping it up a little. If I could get another 2 HP out of it I would be really happy. So is there anything fairly simple I can do to up the HP? I don't want spend tons of time or money but I am willing to do some work this winter. I have looked on the web but have found precious little about hopping up outboards except for the really dramatic increases in HP and RPM. I'm hoping that maybe a larger carb or a different throttle cam or a thinner head gasket or larger exhaust ports might get me the extra HP I want. I don't think I have the time to change all the porting. The exhaust ports are easy to get at but the intake and transfer ports are not. I'm not looking for much of an increase in RPM, I am instead looking for an increase in torque so I can use a prop with more pitch. I have found that a 5 HP motor is fine when it is just me in the boat but when I have a passenger 10 HP works much better. Thanks, Eric |
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