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Old 16 September 2018, 14:18   #1
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Yam F115 underpowered

I have a Yamaha F115 on my Ribtec 655 ex camel trophy. Now Iíve only just put it together as it was sunk so I acquired a second hand engine.
Iíve put recon injectors in, changed the VST filter, and cleaned the whole fuel system through. Now the engine will rev up to 5000rpm happily enough and stay there all day but it feels as if thereís not that much power. The boat will only just get on the plane and will only do 15 kts.
Is this engine just not powerful enough or am I missing something?
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Old 16 September 2018, 14:25   #2
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Engine is overpropped & underpowered for size of the boat.
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Old 16 September 2018, 14:26   #3
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I have an option to get a year old F150, will that be enough?
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Old 16 September 2018, 14:28   #4
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Quote:
Originally Posted by kalokeri View Post
I have an option to get a year old F150, will that be enough?


Itíll be a big improvement. What is the boat rated to?
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Old 16 September 2018, 14:31   #5
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The capacity plate is missing, I have one on order from ribeye but I think originally they were launched with a Honda 150
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Old 16 September 2018, 14:32   #6
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Quote:
Originally Posted by kalokeri View Post
The capacity plate is missing, I have one on order from ribeye but I think originally they were launched with a Honda 150


Ribeye or Ribtec??
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Old 16 September 2018, 14:35   #7
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Ribtec, ribeye bought them out so they are providing a new plate
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Old 16 September 2018, 14:36   #8
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Quote:
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Engine is overpropped & underpowered for size of the boat.
But.... reving to 5000 it should be producing around 100hp ?
I'd have expected it to do better than 15kn
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Old 16 September 2018, 14:38   #9
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But.... reving to 5000 I'd have expected it to do better than 15kn
Yeah thatís what I thought. At 5000rpm the engine sounds sweet but just no power. The prop on it is 13 1/4 x 17 k
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Old 16 September 2018, 14:39   #10
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Thatís on flat water too
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