69 6hp evenrude not getting high rpms.

[Cappy76]

Just got this 6hp evenrude going and took it out on a 10' pond prowler. Engine ran fine but I couldn't get it to to get high rpms in gear, and it goes a lot slower than I was expecting. I'm thinking its prop related. It has a 8×7 three blade on it. I think stock is 8×7.25 two blade. Do u think I would get higher rpms with the 2 blade?

 

[Sea Rider]

What is the max HP the boat is rated for ? If motor is healthy, seems the boat has too much hull drag, the motor is underpowered, it's badly trimmed or with a hub on its way to become fully spun ? Without wot rpm readings won't know if motor runs inside the min-max wot rpm range factory stated. Ear tach is No Bueno...

Happy Boating

 

[dazk14]

Does the boat plane out? The props are nearly the same. Have you verified the motor is running on both cylinders?

 

[JimS123]

8x7 3-blade was standard in the 1970's. Optional OMC props were a 3 blade 5" pitch and a 2 blade 7".

The optional props should surely increase rpm, but you still need a tach.