Reply
 
Thread Tools Search this Thread
 
Old 03 June 2009, 15:45   #1
Member
 
Country: UK - England
Town: plymouth
Make: zodiac
Length: 4m +
Engine: outboard
Join Date: Aug 2008
Posts: 27
mercury 25hp

Hi there i have a 1988 mercury 25hp. I took it into a marine engineer and he has said that the big ends are knocking and that it needs a new carb/clean. i am confident with 4 stroke engines and have rebuilt many. I was thinking that the trasition to a 2 stroke would be fairly easy. The only problem is how easy is it to get the parts for an engine of this age and where would i get them from (parts like big end bearings) finally how easy is it actually going to be. Thanks
__________________

__________________
dirtrider212002 is offline   Reply With Quote
Old 03 June 2009, 16:10   #2
Member
 
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,335
Quote:
Originally Posted by dirtrider212002 View Post
Hi there i have a 1988 mercury 25hp. I took it into a marine engineer and he has said that the big ends are knocking and that it needs a new carb/clean. i am confident with 4 stroke engines and have rebuilt many. I was thinking that the trasition to a 2 stroke would be fairly easy. The only problem is how easy is it to get the parts for an engine of this age and where would i get them from (parts like big end bearings) finally how easy is it actually going to be. Thanks
You will be fine for engine parts for that engine. If you know what you need and need help send me a pm and we will sort you out with part numbers etc and put you onto a local dealer were you can get them from. Will need a serial number. 2 strokes are very very easy to do a rebuild on!, no valves or cylinders heads, timing etc to worry about!!!
__________________

__________________
Turbodiesel is offline   Reply With Quote
Old 15 June 2009, 17:56   #3
Member
 
Country: UK - England
Town: plymouth
Make: zodiac
Length: 4m +
Engine: outboard
Join Date: Aug 2008
Posts: 27
Right then. I have taken the carb apart this evening and have found the problem. Basically i have got a blockage due to corosion in a part on the carb. It is where the float is housed as well as the pin for the choke. It is bolted up by one brass bolt to the main body of the carb. The serial number for the engine is 9425602 (this was taken off a plate on the leg ). If someone could tell me where to get the part and how much it would cost it would be much apreciated. Thanks Nathan
__________________
dirtrider212002 is offline   Reply With Quote
Old 15 June 2009, 18:30   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Personally I'd carry on stripping it til you know the extent and cost of sorting the big ends too. It might work out cheaper to buy another engine.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 16 June 2009, 13:58   #5
Member
 
Country: UK - England
Town: plymouth
Make: zodiac
Length: 4m +
Engine: outboard
Join Date: Aug 2008
Posts: 27
i would like to get it running first just so i can asses that the big ends are definatly gone. Plus the carb is easy to put on and off so its no hardship.
__________________
dirtrider212002 is offline   Reply With Quote
Old 16 June 2009, 14:42   #6
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by dirtrider212002 View Post
i would like to get it running first just so i can asses that the big ends are definatly gone. Plus the carb is easy to put on and off so its no hardship.
Well... sort of. If you've not heard a 2 stroke roller bearing big end going, they don't sound the same as 4 strokes with white metal bearings. If it's electric start you should be able to determine if it's the big ends by lubing the bores up and spinning it over on the starter motor whilst using a screwdriver as a stethoscope.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 18 June 2009, 13:12   #7
Member
 
Country: UK - England
Town: plymouth
Make: zodiac
Length: 4m +
Engine: outboard
Join Date: Aug 2008
Posts: 27
No its not a electric start. Basically i took it to a guy who claims to be a marine engineer but he seems to have bulshited alot. basically i just want to get it running first. Anyone no where i can get the part.
__________________
dirtrider212002 is offline   Reply With Quote
Old 18 June 2009, 14:49   #8
Member
 
Country: UK - England
Town: Hamble
Length: 9m +
Join Date: Dec 2002
Posts: 2,317
is it this?
Attached Thumbnails
Click image for larger version

Name:	25 merc.jpg
Views:	133
Size:	68.1 KB
ID:	43394  
__________________
It is better to remain silent and be thought a fool, than to speak and remove all doubt!
Dirk Diggler is offline   Reply With Quote
Old 18 June 2009, 15:36   #9
Member
 
Country: UK - England
Town: plymouth
Make: zodiac
Length: 4m +
Engine: outboard
Join Date: Aug 2008
Posts: 27
yep thats exactly it i need part 4. where the float lives. Any idea where i can get it and how much. Thanks everyone
__________________
dirtrider212002 is offline   Reply With Quote
Old 19 June 2009, 02:31   #10
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
didn't turbo diesel make you an offer of help? failing that Marinautic are very good. if you can get the guy in the parts department he's very good
__________________

__________________
Rogue Wave 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 20:48.


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