Good morning All,
I have a 2017 Ranger VS1780 with a 135HO Evinrude.
When I first purchased the boat It came with a Cyclone TBX 14 1/8 x 19" Propeller, Part # 763942. The engine was mounted 2 holes from the top. The max rpm with this setup and the load I carry (My wife and I + fishing gear) was 4200rpm and 39mph. I have since Raised the engine to the highest hole and installed a 3 blade Rebel TBX 15 1/2 x 17" Propeller, Part # 763986. The setup now sees 4950rpm at 41.5mph. I am looking for some advice on what I should do next to get the engine to the optimum RPM? It runs great and revs all the way through the rpm range in neutral, as well has a great holeshot and accellerates well to 40mph.
Any advice at all would be appreciated
Your rpm is too low and you are lugging the motor which could shorten its life eventually.
Keep experimenting with engine height and propellers. It is trial and error but your Ranger dealer should be knowledgeable in prop choice.
You want to turn the engine close to the midrange for best all around performance, close to 5500 rpm trimmed correctly for best speed. Rebel 15" or a Viper 17" depending on whether you are looking for top speed, cruising fuel economy and acceleration.