Classic SeaCraft Community  

Go Back   Classic SeaCraft Community > General Discussion > Performance
FAQ Community Calendar Today's Posts Search

Notices

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-24-2010, 08:09 PM
captdan captdan is offline
Junior Member
 
Join Date: Apr 2010
Posts: 11
Default yamaha F115

Looking to repower a 20ft MA. I want to repower with a 4 stroke and was wondering if a 115hp would work. Do you think it will be slugish with 3people? I know a 150 would work but I found a good deal on a 115hp. thoughts?
Reply With Quote
  #2  
Old 05-24-2010, 09:33 PM
BigLew BigLew is offline
Senior Member
 
Join Date: Jan 2007
Location: Newburyport Area; Massachusetts
Posts: 1,364
Default Re: yamaha F115

Fr. Frank seems VERY happy with a Merc 90HP on his Seafari. I'm sure he'll chime in on the subject.
__________________
Getting home is more important than getting there!

Plan accordingly!
Reply With Quote
  #3  
Old 05-24-2010, 11:39 PM
eggsuckindog eggsuckindog is offline
Senior Member
 
Join Date: Mar 2003
Location: Tampa
Posts: 2,354
Default Re: yamaha F115

Those motors although very reliable are not the strongest horse in the barn - would be woefully under peowered. When new we never rigged any with less than the inline Merc 150's and they don't stack up to modern 2 strokes. It may be a good deal, I just don't think for you. Its not based on top speed, its handling at mid range to keep the boat up on top - drive-ability. It will suck fuel too, 4 strokes are not any better near wide open, their all hungry.
JMHO
__________________
Any way you measure it - dumbass is expensive
Reply With Quote
  #4  
Old 05-25-2010, 01:37 PM
ricknewman ricknewman is offline
Senior Member
 
Join Date: Jun 2009
Location: Eastern Shore, Va
Posts: 164
Default Re: yamaha F115

I had a 115 Everdog 2 stroke on mine and was never happy. The fuel burn was good but on those few nice days when you can turn her loose it left you wanting.
Reply With Quote
  #5  
Old 05-25-2010, 04:09 PM
captdan captdan is offline
Junior Member
 
Join Date: Apr 2010
Posts: 11
Default Re: yamaha F115

Thanks for the imput. I just found fund a good deal on a yamaha
130hp 2 stroke with low hrs. Im thinking that should work fine.
Reply With Quote
  #6  
Old 05-26-2010, 01:28 AM
Fr. Frank Fr. Frank is offline
Senior Member
 
Join Date: Oct 2003
Location: Shalimar, Florida
Posts: 2,265
Default Re: yamaha F115

Ye, I love my 5+ mile to the gallon with my 90 hp Optimax on my 20' Seafari. WOT mid-low 30's.

But I confess their are days I really miss pushing the boat past 50 mph like I could with the old V6 Merc.

The 130 Yamaha 2S may be just right. I love those "Tower of Power" 140/150 I6 Mercs, though.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
Reply With Quote
  #7  
Old 05-27-2010, 05:06 PM
eggsuckindog eggsuckindog is offline
Senior Member
 
Join Date: Mar 2003
Location: Tampa
Posts: 2,354
Default Re: yamaha F115

Quote:
Thanks for the imput. I just found fund a good deal on a yamaha
130hp 2 stroke with low hrs. Im thinking that should work fine.
would work much better, even a V6 150 Merc is pretty light too
__________________
Any way you measure it - dumbass is expensive
Reply With Quote
  #8  
Old 06-02-2010, 01:30 PM
apneadreams apneadreams is offline
Member
 
Join Date: Oct 2009
Location: Yorktown, VA.
Posts: 35
Default Re: yamaha F115

I have a F115 on my 20' '71 seacraft and love it...3 people, 60 gallons gas, offshore fishing gear, ice ect...we cruise 27kts @ 4500 rpm...average gas mpg is 4.5miles/gallon...wot w/ 20 gallons, 2people is 38kts @5900 rpm...
Reply With Quote
  #9  
Old 06-07-2010, 10:22 PM
eggsuckindog eggsuckindog is offline
Senior Member
 
Join Date: Mar 2003
Location: Tampa
Posts: 2,354
Default Re: yamaha F115

Quote:
I have a F115 on my 20' '71 seacraft and love it...3 people, 60 gallons gas, offshore fishing gear, ice ect...we cruise 27kts @ 4500 rpm...average gas mpg is 4.5miles/gallon...wot w/ 20 gallons, 2people is 38kts @5900 rpm...
Those are excellent numbers, although I have the same boat with a fresh 200 merc and you couldn't pay me to run it with less than 150 but I guess thats me.
Second reason, I wouldn't consider buying one with only 115 - I wouldn't want to try and sell one either and deal with the constant "Seems unpowered" question a million times. These are pretty high permance hulls and need HP to work properly, but your happy with yours and it seems by those numbers very close to my 200, thats strong for a 115- I'm at 3800 to get 27kts I think thats about 31/32.
__________________
Any way you measure it - dumbass is expensive
Reply With Quote
  #10  
Old 06-11-2010, 10:20 PM
fins38 fins38 is offline
Junior Member
 
Join Date: Nov 2008
Location: Annapolis, MD
Posts: 15
Default Re: yamaha F115

I have this set up on a shorter bracket. Boat will run 37 knots top end 6100 RPM. Cruise @4000 RPM at 23 knots and only burn 5 gallons an hour. Haven't tried to plane on one engine, but for range and fuel burn she's set up perfectly. if you want specifics let me know.
Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:33 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
All original content © 2003-2013 ClassicSeacraft