2020 188 svf 60 Yamaha ? about speed and rpms
- Thread starter KrazyKim
- Start date
Jack M
Moderator
I have a "suggested " prop chart that Bennington provides to dealers . An 18 ft with a 60 hp, there are 2 sizes listed ,a 13.8 X 11 and a 12 X 10.5 .
You can also contact Ken at https://propgods.com
Phone number is 941 735 5808
You can also contact Ken at https://propgods.com
Phone number is 941 735 5808
Jack M
Moderator
Also ,yes your RPM's are too high ,at WOT should be 5000-6000
www.rubexprops.com
Yamaha WOT RPM Chart
Wide open throttle RPM range chart for Yamaha powered boats.
www.rubexprops.com
That’s what we figured. What can cause the high rpm’s?Also ,yes your RPM's are too high ,at WOT should be 5000-6000
Yamaha WOT RPM Chart
Wide open throttle RPM range chart for Yamaha powered boats.
Jack M
Moderator
Incorrect prop . Give Ken a call at propgods.com a call , He'll get you straightened out
Vikingstaff
Moderator
As Jack mentioned, absolutely under propped. By running a larger (probably pitch) prop you will bring down the RPM’s at WOT. You want to get to the upper end of your rpm range at WOT on a light load. Goal would be 1/2 tank or less of fuel, only 1-2 people, calm water. Run it at WOT and ideally run about 5800-6000 rpms in that scenario. That’s where you want to be with a prop. At 1000 rpm’s over motor rev limit is a lot, and nott good.
Running above rev limit range is NOT good on that motor. You mention “new to you”. Pre-owned purchase? Did the previous owner run the boat with that prop? If so, that would raise some BIG concerns for me if that motor has been under propped and run above rev limit for 3-4 years. Yike!
What prop size and make is on it now? Ken at Propgods has served MANY members very well. Super knowledgeable. Within the limits of the boat you have, performance should improve a bit with the right prop. More importantly, the risk of damaging, or continuation to damage, that motor will be mitigated.
Running above rev limit range is NOT good on that motor. You mention “new to you”. Pre-owned purchase? Did the previous owner run the boat with that prop? If so, that would raise some BIG concerns for me if that motor has been under propped and run above rev limit for 3-4 years. Yike!
What prop size and make is on it now? Ken at Propgods has served MANY members very well. Super knowledgeable. Within the limits of the boat you have, performance should improve a bit with the right prop. More importantly, the risk of damaging, or continuation to damage, that motor will be mitigated.