Yamaha 115hp 4 stroke 20mph only????

[kyong1]

My Carolina skiff 198DVL only ride at 20mph at full throttle.. With a 115hp 4 stroke 2011 I feel Yamaha should go faster... change d sparkplugs; fuel filters; all oils. What could the community recommend. My appreciation thanks inshore fishing

 

[GA_Boater]

It really helps to know if this is a new problem. Did the boat go faster in the past and began slowing?

Time for basics - Fresh fuel, check compression and check for spark on all cylinders to begin with.

 

[kyong1]

Not a new problem....however like i said I do inshore fishing. The boat was bought used and never needed to go faster until I just decided to peak out rpm and accelerate r all the way forward 22mph max??? MPH Gage 60mph.....
saywhaa

 

[GA_Boater]

Max speed on a speedo means nothing.

 

[kyong1]

My GPs reads the same,

 

[jerryjerry05]

What rpm's at wide open?
What size prop?
Damage on the prop?
Does it sound like the motors revving up but the boats not moving? Damaged hub in the prop.
Remove the prop and look for rubber pieces, then draw a line across the hub and prop and go for a ride.
Inspect the prop and see if the line's moved. Spun hub.

 

[kyong1]

Well mark the pro. And went for a long ride. Max at 23.5 at 4800 rpms. Checked the pro after wards and seems like I need to rerun when weather gets better permanent marker didn't work..

 

[robert graham]

If motor is fuel injected then you could have a plugged injector screen causing loss of power on that cylinder....

 

[kyong1]

Injectors were all replaced...,

 

[kyong1]

In the process in draining fuel tank and disassemble vst when weather's get better, that should to it.,..,,

 

[dingbat]

A buddy has the 115 on a 21DV. Boat runs mid to upper 30’s

Your a 1,000 rpm shy of WOT. Checked compression? What prop are you running?

 

[kyong1]

A Solas 13 1/4x17...which came with Carolina 198 DLV 2011... compression will my last choice... Thanks

 

[jerryjerry05]

Yo sure the tach is correct?
They sell a Tiny Tach just ground the wire and wrap another around the plug lead and compare the readings.

 

[dingbat]

performance spec for your boat with a 115 lists WOT at 40 mph.

http://www.suzukimarine.com/~/media...olina Skiff/Carolina Skiff 198DLV DF115A.ashx

 

[kyong1]

Thank for all reply s