F115TLR

[slharman1]

Ok, I'm not sure if this has already been discussed but please help if you can.
I have a new to me 05 F115TLR on a 06 Crest pontoon boat.
My problem is that when I am on the water i cannot get to WOT. The boat runs fine at 3500RPMs and below but when i try to go higher the motor bogs down.
If I try a hole shot, the boat will take off great but when it gets to 3800 rpms or so it will bog down and run slower.

Also, when taking tha VST out I found someone had put an inline filter between the low pressure pump and the VST. Nothing in the Yammie service manual about that filter. So I have two filters before the vst.

It is a 2005 with only 265 hrs on it so I am thinking it has done a lot of sitting.

Also, thanks to the dealer i got it from they put in a short block due to the motor not running correctly.

I do have E10 fuel in it right now along with seafoam.

After this tank is gone there will be nothing but non-ethanol fuel for my boat.

Any suggestions?

I have cleaned the injectors DIY style and removed and cleaned the VST and VsT filter today, so I will try it in the morning on the water.

Something tells me i am not getting lucky tomorrow. Is the something electrical that could be causing this issue?

How do i go about diagnosing the problem?

Any help would be appreciated.

Thanks

 

[ondarvr]

The E-10 is fine, changing to E-0 will have no effect.

Did he plug it in to read any codes?

 

[99yam40]

monitoring fuel pressures should tell you if there is a restriction.
sending off the injectors to have then flow tested and cleaned would be a good idea if the pressures stay in spec when problem shows up

 

[slharman1]

Ok guys, got it on the lake today to test out and after cleaning the VST tank and filter and a DIY cleaning of the injectors - no more bogging!

No codes, but they put the short block in after threatening them for the unethical sale.

Now here's the thing, I am getting 5200-5300 RPMs at WOT, I was hoping for closer to 6000. I am thinking of getting the injectors cleaned to see if I gain some RPMs - do you think that will help increase the WOT, if not i would rather not spend the $130 for the cleaning.
Thanks in advaance.
Steve

 

[ondarvr]

Might be, but it could be the prop too.

 

[99yam40]

the dealers normally have test wheels for running motors in tanks to see if they can tun then up to a certain RPM.
without using one of thoise it is everyones guess as to what your problem might be.
Look at YPB to see if you can find a set up like yours to see what prop they used as a guide
http://yamahaoutboards.com/owner-resources/performance-bulletins