Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-01-2007, 09:44   #1
Registered User
 
Sunspot Baby's Avatar

Join Date: May 2003
Location: New Bern, NC
Boat: Prout Manta 38' Catamaran - Sunspot Baby
Posts: 1,521
Images: 14
Converting 9.9 Merc Two-Stroke to 15hp

I have a 2002 Mercury 2 stroke 9.9 outboard. I understand the 9,9 and 15 hp engines are exactly the same except for carburetor and prop. I need to convert my 9.9 to a 15. Does anyone on the forum know which carburetor and prop are standard on the 15?

Reason: My Zodiac compact RIB was rated at 10 hp max. It was stolen and when I replace, I will buy a dinghy rated at 15. Rather than operate with less power than the boat can effectively use, or buy another motor, I think the best option is to convert the one I have. A new carb and prop will be a lot less than the $$ difference if I sell mine used and buy a new 15.

In answer to your question the dinghy was not stolen from the boat. I had it in a locked storage yard on my little utility trailer. Both are gone. I seldom use the trailer and it is nice to have the dinghy out of the way when we are doing our summer projects on the boat I donít see either often. Iím not even sure when they were taken.

The engine, oars, anchor, etc were in my garage, so all I lost was the dinghy. Looks like my boat insurance is going to cover the dinghy loss with a $250 deductible. Home ownerís wonít cover trailer unless it was stolen from my property.

If anyone is offered a good deal on a West Marine (Zodiac) 10í compact rib, check the number. Mine is WMP P3907 C 404.

A reward is offered for information leading to recovery. Private message me on this forum.

George
__________________

__________________
She took my address and my name
Put my credit to shame
Sunspot Baby, sure had a real good time
Bob Seger
Sunspot Baby is offline   Reply With Quote
Old 05-01-2007, 05:25   #2
Registered User
 
Sunspot Baby's Avatar

Join Date: May 2003
Location: New Bern, NC
Boat: Prout Manta 38' Catamaran - Sunspot Baby
Posts: 1,521
Images: 14
I am adding this note to keep this string active. Someone on this forum probably knows the answer.

George
__________________

__________________
She took my address and my name
Put my credit to shame
Sunspot Baby, sure had a real good time
Bob Seger
Sunspot Baby is offline   Reply With Quote
Old 05-01-2007, 12:17   #3
Registered User
 
Doghouse's Avatar

Join Date: May 2006
Location: Hampton Roads, va
Boat: Catalina 387 - Magical Dreamer
Posts: 176
Images: 1
15 hp Carburetor........Part # 1392-9726T18
15 hp
Exhaust kit........Part # 41344-T6
and Gasket kits


Those are your part numbers. I google searched on mercruiser outboard conversion 15 pages of potential results. I did not search that far in...
__________________
Doghouse is offline   Reply With Quote
Old 11-01-2007, 06:50   #4
Registered User
 
Sunspot Baby's Avatar

Join Date: May 2003
Location: New Bern, NC
Boat: Prout Manta 38' Catamaran - Sunspot Baby
Posts: 1,521
Images: 14
Thanks Doghouse. I just got on to post the same info from the smalloutboards site.

George
__________________
She took my address and my name
Put my credit to shame
Sunspot Baby, sure had a real good time
Bob Seger
Sunspot Baby is offline   Reply With Quote
Old 11-01-2007, 09:34   #5
Registered User
 
Sonny's Avatar

Join Date: Sep 2006
Location: CT
Boat: Jeanneau SO 49
Posts: 98
Images: 29
I wonder if this works on other outboards or is this just typical of newer Mercs
__________________
Sonny,
s/y NIRVANA, SO49
Sonny is offline   Reply With Quote
Old 11-01-2007, 09:39   #6
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Most 9.9's are detuned 15's. Check with your dealer.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 11-01-2007, 11:28   #7
Registered User
 
Sunspot Baby's Avatar

Join Date: May 2003
Location: New Bern, NC
Boat: Prout Manta 38' Catamaran - Sunspot Baby
Posts: 1,521
Images: 14
Sonny:

The reason I pursued this was that in another life I had an Evenrude 9.9 that could be converted to 15 simply by changing carbs. A prop with more pitch took advantage of the 50% increase in power. I lived on a private lake with an HP limit of 10. Being able to make a stealth 15 out of my 9.9 was a very appealing option. Driving a 16' pontoon boat that extra 5 hp made a big difference. Still the little john boats with 8 hp ran off and left me.

George
__________________
She took my address and my name
Put my credit to shame
Sunspot Baby, sure had a real good time
Bob Seger
Sunspot Baby is offline   Reply With Quote
Old 18-09-2008, 14:21   #8
Registered User

Join Date: Sep 2008
Posts: 2
Mercury 9.9hp Conversion to 15hp

Hey,

I have a 1996 merc 9.9 2 stroke outboard and im looking to convert it into a 15. I know that I need a 1392-9726T18 Carb, but is there anything else. Exhaust kit possibly? Thanks
__________________
dutch45 is offline   Reply With Quote
Old 18-09-2008, 18:01   #9
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
Are you sure that it only needs a carb

Are you sure that the bore and stroke of a 9.9 is the same as a 15?
__________________
Chief Engineer is offline   Reply With Quote
Old 18-09-2008, 21:53   #10
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
I took an outboard repair class last summer from a local community college. My assigned motor was a Mercury 9.9. The difference is the jet in the carburetor. All the other goodies are the same engine. The reason? California freshwater areas are apparently limited to ten HP.
__________________
Roy M is offline   Reply With Quote
Old 18-09-2008, 22:10   #11
Registered User

Join Date: Jan 2006
Location: Rhode Island
Boat: Tayana FD-12
Posts: 612
Images: 6
mercury parts website used to have an easily accesible parts diagrams. It seem weird that 9.9 and 15 had the exact same parts diagram. There were several carbs listed as options 9.9 and 15 bein two of them. Next time I need a carb, i might just order a 15HP.
__________________
phorvati is offline   Reply With Quote
Old 19-09-2008, 08:42   #12
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
What's weird about it? The costs involved in engineering, production, inventory, training, etc., are big. If someone realizes they can meet a bureaucratic regulation that opens an entirely new market, simply by removing and replacing a single, cheap component, that deserves some credit, don't you think? Oh, and I forgot the other difference: You have to change the decal on the motor housing from 9.9 to 15, or buy a different housing.
__________________
Roy M is offline   Reply With Quote
Old 19-09-2008, 09:35   #13
Registered User
 
Sunspot Baby's Avatar

Join Date: May 2003
Location: New Bern, NC
Boat: Prout Manta 38' Catamaran - Sunspot Baby
Posts: 1,521
Images: 14
I did this on mine. At first I was told I needed, a couple of other parts in addition to the carb but a local shop looked up all the parts for me and the carb was the only change. Works great.

I carry the old 9.9 hp carb as a spare.

George
__________________
She took my address and my name
Put my credit to shame
Sunspot Baby, sure had a real good time
Bob Seger
Sunspot Baby is offline   Reply With Quote
Old 19-09-2008, 09:58   #14
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Quote:
Originally Posted by Roy M View Post
What's weird about it? The costs involved in engineering, production, inventory, training, etc., are big. If someone realizes they can meet a bureaucratic regulation that opens an entirely new market, simply by removing and replacing a single, cheap component, that deserves some credit, don't you think? Oh, and I forgot the other difference: You have to change the decal on the motor housing from 9.9 to 15, or buy a different housing.
Why change the decals? Or is there some regulation requiring this? The lower end outboards like the 9.9 are lees likely to be stolen and 15 HP seems to be the starting point for theft.
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 19-09-2008, 09:58   #15
Registered User

Join Date: Jan 2006
Location: Rhode Island
Boat: Tayana FD-12
Posts: 612
Images: 6
Hey George,
do you notice the difference now. I mean can you get up and plane with bigger load then before?
My main motivation is the ability to plane, with grocerries, and full gas tank or with an extra person.
Petar
__________________

__________________
phorvati is offline   Reply With Quote
Reply

Tags
2 stroke

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
OMC 2-Cylinder 15hp 2-Stroke Sail Drive Engine Van Engines and Propulsion Systems 7 17-04-2010 07:19
Shear Pin in 2-Stroke 15hp Yamaha Outboard... beachgirl1952 Propellers & Drive Systems 3 18-01-2010 16:35
2 stroke vs 4 stroke? Shaft length? Piper'sGirl Engines and Propulsion Systems 6 06-06-2008 15:08
4-Stroke vs. 2-Stroke Outboards The_PIRATE Engines and Propulsion Systems 17 05-10-2007 05:37
Yanah 15HP vs. Tohatsu 18HP (2-Stroke OB) The_PIRATE Engines and Propulsion Systems 2 28-08-2007 13:34



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:05.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.