HewesYourDaddy Posted July 16, 2017 Report Share Posted July 16, 2017 Sounds like you have a great dealer to handle issues with. Link to comment Share on other sites More sharing options...
Dawgfan Posted July 17, 2017 Report Share Posted July 17, 2017 Something to think about; prop may have too much cup. If so, RPM's are greatly reduced. Unfortunately, propping a boat is not an exact science, just keep messing with it and you'll find your issue..... Link to comment Share on other sites More sharing options...
Dcabot65 Posted July 21, 2017 Report Share Posted July 21, 2017 Update.......Yamaha has told marina I have to run 93 octane to raise the rpm's so they are going to try this and see. I have never heard of something so ridiculous! Link to comment Share on other sites More sharing options...
AFE CUMMINS 6.7 Posted July 21, 2017 Author Report Share Posted July 21, 2017 I've not seen any marina in the area sell rec fuel (ethanol free) in 93 octane. I've only seen rec fuel in 90 octane. Did the marina try different pitch props and the rpms were still low? Link to comment Share on other sites More sharing options...
Dcabot65 Posted July 21, 2017 Report Share Posted July 21, 2017 Trying to decipher their code of they have tried everything and are stumped. When I mention props they keep saying this is the test prop it should be right. Being long distance can be a PIA! Link to comment Share on other sites More sharing options...
AFE CUMMINS 6.7 Posted July 21, 2017 Author Report Share Posted July 21, 2017 The prop just takes 5 minutes to change. I'm curious as to why they would not try changing the prop before anything else. This would identify if the motor can spin up to 6000 rpm. If the motor is not able to spin up to 6k, then diagnosis from there, but if it can get up to 6k, then it's probably a propping issue, not a motor issue. On another note I'm now curious about running a higher octane fuel or using an octane booster. Link to comment Share on other sites More sharing options...
Dawgfan Posted July 22, 2017 Report Share Posted July 22, 2017 Update.......Yamaha has told marina I have to run 93 octane to raise the rpm's so they are going to try this and see. I have never heard of something so ridiculous! That is absolutely the dumbest thing I have ever heard.....I'd like to know the name of the person as Yamaha that told you that........Octane won't solve your problem..... Link to comment Share on other sites More sharing options...
Dawgfan Posted July 22, 2017 Report Share Posted July 22, 2017 Here are the answers.....too much pitch, or cup or rake. End of the story...... Link to comment Share on other sites More sharing options...
Dcabot65 Posted July 22, 2017 Report Share Posted July 22, 2017 4 hours ago, AFE CUMMINS 6.7 said: The prop just takes 5 minutes to change. I'm curious as to why they would not try changing the prop before anything else. This would identify if the motor can spin up to 6000 rpm. If the motor is not able to spin up to 6k, then diagnosis from there, but if it can get up to 6k, then it's probably a propping issue, not a motor issue. On another note I'm now curious about running a higher octane fuel or using an octane booster. Totally agree, can't understand why they haven't done this first and seem to damnce around the question Link to comment Share on other sites More sharing options...
Moderator Posted July 22, 2017 Report Share Posted July 22, 2017 DCabot, Out of courtesy to the OP.. Please switch this discussion over to your thread. And I agree: Throw a 21 pitch SWS-II on the motor and see if the RPM's top out with that prop.. Then you will know what the solution-path will be. Mod-1 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.