Reply
 
Thread Tools Search this Thread
 
Old 21 April 2008, 15:49   #1
Member
 
Country: UK - England
Boat name: Yam340S
Make: Yamaha (Zodiac)
Length: 3m +
Engine: Mariner 8HP 4stroke
Join Date: Mar 2008
Posts: 45
Mariner 8 vs 9.9 HP four stroke outboard

I have Mercury Mariner 8HP four stroke outboard.
Does anyone know the difference (apart from HP) between 8HP and 9.9HP Mercury Mariner four stroke models from 2005 & 2006 (2007)?
Both engines look the same and the data in the brochures is identical including the weight.
Have Mercury restricted 8HP in some way or 9.9HP has different carb&jets too? Would appreciate if anyone has any info on this.
Please see the photo of my 8HP below if this helps.
Attached Thumbnails
Click image for larger version

Name:	Mariner_throtle.jpg
Views:	580
Size:	43.6 KB
ID:	34186  
__________________

__________________
danilo is offline   Reply With Quote
Old 21 April 2008, 16:19   #2
Member
 
Locozodiac's Avatar
 
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Quote:
Originally Posted by danilo View Post
I have Mercury Mariner 8HP four stroke outboard.
Does anyone know the difference (apart from HP) between 8HP and 9.9HP Mercury Mariner four stroke models from 2005 & 2006 (2007)?
Both engines look the same and the data in the brochures is identical including the weight.
Have Mercury restricted 8HP in some way or 9.9HP has different carb&jets too? Would appreciate if anyone has any info on this.
Please see the photo of my 8HP below if this helps.
8 & 9.8 models are the same engine, both 209 CC, 8 carb restricted, that I know there isn't any 9.9 model in four strokes only in two strokes, next four strokes models/range are 15 & 20, both 351 CC, 15 being carb restricted. 8 & 9.8 weights the same 37 kilos, All Tohatsu made in Japan.

Happy Boating
__________________

__________________
Locozodiac is offline   Reply With Quote
Old 21 April 2008, 16:37   #3
Member
 
Country: UK - England
Boat name: Yam340S
Make: Yamaha (Zodiac)
Length: 3m +
Engine: Mariner 8HP 4stroke
Join Date: Mar 2008
Posts: 45
Quote:
Originally Posted by Locozodiac View Post
that I know there isn't any 9.9 model in four strokes only in two strokes
Mercury/Mariner have been making 9.9 four strokes in 2004,2005,2006,2007 and 2008 see attached.Short shaft 8 and 9.9HP weights 38kg.
Attached Thumbnails
Click image for larger version

Name:	mariner8-9.9-15.JPG
Views:	455
Size:	11.4 KB
ID:	34187  
__________________
danilo is offline   Reply With Quote
Old 21 April 2008, 16:48   #4
Member
 
Locozodiac's Avatar
 
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Quote:
Originally Posted by danilo View Post
Mercury/Mariner have been making 9.9 four strokes in 2004,2005,2006,2007 and 2008 see attached.
Probably a special number series for Mariner/Mercury brand, Tohatsu has not a 9.9, anyway same CC for 8 & 9.9. Strange cause 9.9 and 15 used to be the same, only carb rstricted.
__________________
Locozodiac is offline   Reply With Quote
Old 22 April 2008, 15:39   #5
Member
 
m chappelow's Avatar
 
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
i have a tohatsu 8 hp 4 stroke 2 years old and looking in the spec in the manual it is pared with a 9.8 the only difference that i can see is the main jet size and a different prop , everyone tells me that my tohatsu is just the same as a mercury /yamaha 8 hp 4 stroke.
__________________
m chappelow is offline   Reply With Quote
Old 22 April 2008, 17:27   #6
Member
 
Country: UK - England
Town: cornwall
Boat name: nothing
Make: rib eye 430
Length: 4m +
Engine: tatsu 50
MMSI: 666
Join Date: Mar 2006
Posts: 1,916
Could it be as i was told here that one manufacturer measures the power at the crank while the other measures at the prop ?? just an idea
__________________
ian parkes is offline   Reply With Quote
Old 22 April 2008, 18:29   #7
Member
 
Country: UK - England
Boat name: Yam340S
Make: Yamaha (Zodiac)
Length: 3m +
Engine: Mariner 8HP 4stroke
Join Date: Mar 2008
Posts: 45
Quote:
Originally Posted by m chappelow View Post
i have a tohatsu 8 hp 4 stroke 2 years old and looking in the spec in the manual it is pared with a 9.8 the only difference that i can see is the main jet size and a different prop , everyone tells me that my tohatsu is just the same as a mercury /yamaha 8 hp 4 stroke.
Are you able to post some pics of your outboard here?
__________________
danilo is offline   Reply With Quote
Old 23 April 2008, 05:11   #8
Member
 
Country: Netherlands
Town: Holland
Make: Brig F360S
Length: 3m +
Engine: Yamaha 70hp
Join Date: Jan 2008
Posts: 85
Quote:
Originally Posted by ian parkes View Post
Could it be as i was told here that one manufacturer measures the power at the crank while the other measures at the prop ?? just an idea
No, since around '80-'85 all manufactorers switched measurement from crank to prop, 100hp equals roughly 85hp on the prop, so a 15% loss. Nowadays every hp measurement is @ the prop.
__________________
reinier is offline   Reply With Quote
Old 06 January 2012, 04:18   #9
Member
 
Country: Poland
Length: 3m +
Join Date: Jan 2012
Posts: 2
merc 8 and 9.9 4strokes

Hi Everyone,
im looking for information about upgradeing the 8HP to 9.9.
In parts catalogue the differences are in Carburetor, main jet, main nozzle and plug serial numbers.
The ingnition components are the same.
Can someone tell me is there a chance to upgrade the motor without changeing the carburetor? - getting new main jet, main nozzle and plug?!
thanks
MDD
__________________
mdziam_78 is offline   Reply With Quote
Old 06 January 2012, 14:40   #10
Member
 
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,335
Looks like the only difference is the carb.
__________________

__________________
Black Dog Marine
www.blackdogmarine.com
Turbodiesel 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 03:45.


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