Reply
 
Thread Tools Search this Thread
 
Old 11 July 2016, 13:49   #1
Member
 
Akira's Avatar
 
Country: UK - England
Town: London
Boat name: TT Magic Star
Make: Excel 365 Vanguard
Length: 3m +
Engine: Honda BF20
Join Date: Jul 2016
Posts: 46
Mariner - Difference between Tohatsu and Yamaha

Hi guys,

I just got a mega-super deal on a brand new Mariner 25 HP 2 stroke. The poor thing was bought and put in the garage in 2004, and never seen the water. So I got it without ant scratch or dent, the gear oil never changed, the implelor still original.

I was wondering if I can get it uprated to 30hp. I have red the threads about, but the engine I have seems different. How can I tell if this is a Yamaha or Tohatsu?

The flywheel is not dented, is plain like on the pics (from Internet, but mine is similar) and the numbers are marked from 0 to 40 in both directions.

http://i1231.photobucket.com/albums/...psa79e2538.jpg

http://smalloutboards.com/images/mer...nsideside2.jpg

Could anyone tell me if this engine is upratable to 30 HP? Thanks to help

P.S. Serial number OP290850
Book stamped 09-10-2004
__________________

__________________
Akira is offline   Reply With Quote
Old 11 July 2016, 15:42   #2
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,420
That's not a yamaha it's the Mercury version mariner
Not sure if they were badge engineered tohatsu engines
As for upgrading look for threads about upgrading mercury 25
__________________

__________________
beamishken is offline   Reply With Quote
Old 11 July 2016, 15:44   #3
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,684
IIRC isn't it as simple as removing the restrictor gasket on the carb on this engine, 12 or something??
__________________
Max... is offline   Reply With Quote
Old 11 July 2016, 16:06   #4
Member
 
Akira's Avatar
 
Country: UK - England
Town: London
Boat name: TT Magic Star
Make: Excel 365 Vanguard
Length: 3m +
Engine: Honda BF20
Join Date: Jul 2016
Posts: 46
Thanks for replies, guys, very good news about the up rating possibility
This week end I will post few pictures to be sure, if you could take a look, thanks
__________________
Akira is offline   Reply With Quote
Old 11 July 2016, 17:23   #5
Member
 
samt's Avatar
 
Country: UK - England
Town: Midlands
Make: RNLI Y-Class
Length: 3m +
Engine: Mercury 15hp 2st
Join Date: Jul 2006
Posts: 850
RIBase
Mariner - Difference between Tohatsu and Yamaha

If yours looks like this under the hood, then yes you can upgrade (image below) If its the same as your top image, then no you can't. Your second image is of a 15hp btw.

It wouldnt be yam based in 2004.

Click image for larger version

Name:	ImageUploadedByRIB Net1468275804.978931.jpg
Views:	113
Size:	278.6 KB
ID:	114353
__________________
samt is offline   Reply With Quote
Old 11 July 2016, 17:31   #6
Member
 
Akira's Avatar
 
Country: UK - England
Town: London
Boat name: TT Magic Star
Make: Excel 365 Vanguard
Length: 3m +
Engine: Honda BF20
Join Date: Jul 2016
Posts: 46
Quote:
Originally Posted by samt View Post
If yours looks like this under the hood, then yes you can upgrade (image below) Attachment 114353
Samt, that's the point, it does not look like this. The flywheel is completely round, as on the pics I gave the links to, no any indentation at all.
__________________
Akira is offline   Reply With Quote
Old 19 July 2016, 08:55   #7
Member
 
Country: Canada
Town: GTA
Boat name: Zodiac
Make: Zodiac Futura MkIII
Length: 4m +
Engine: 50 HP ETec Tiller
Join Date: Aug 2010
Posts: 201
If you remove the air restrictor then you must install a larger main jet to maintain air/fuel balance. Otherwise you'll run too lean.
__________________
Northern Pike is offline   Reply With Quote
Old 19 July 2016, 09:22   #8
Member
 
Akira's Avatar
 
Country: UK - England
Town: London
Boat name: TT Magic Star
Make: Excel 365 Vanguard
Length: 3m +
Engine: Honda BF20
Join Date: Jul 2016
Posts: 46
Quote:
Originally Posted by Northern Pike View Post
If you remove the air restrictor then you must install a larger main jet to maintain air/fuel balance. Otherwise you'll run too lean.
Thanks, mate, do I get it from the 30hp model?

There were many talks about this update, and I saw only the air restricting gasket replacement and some carb adjustment, but nothing about a bigger main jet?
__________________
Akira is offline   Reply With Quote
Old 19 July 2016, 11:04   #9
Member
 
Country: Canada
Town: GTA
Boat name: Zodiac
Make: Zodiac Futura MkIII
Length: 4m +
Engine: 50 HP ETec Tiller
Join Date: Aug 2010
Posts: 201
I don't know about Mercs. I did this with an OMC. Went from 20 to 25. I searched the parts micro fiche to see what parts were different. I suggest you do the same. See if the exhaust tuner (chamber, whatever) is the same too.

You could probably just enlarge the hole in the existing air intake. That's what I did.
__________________

__________________
Northern Pike is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 22:27.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.