Reply
 
Thread Tools Search this Thread
 
Old 22 March 2015, 12:17   #1
Member
 
popeyethesailor's Avatar
 
Country: UK - England
Town: St Neots ( Cambs)
Boat name: Red Oktober
Make: Avon SR4
Length: 4m +
Engine: 40hp
Join Date: Aug 2013
Posts: 116
40 hp 2 stroke

Just a general question
Would you consider it normal for a mariner 2 stroke 40 to be a little 'lumpy' at idle?
Before I go and take the carb apart to give it a good clean which I am a bit reluctant to at the min as I am taking it out for the first time in a few weeks and it is working just a little lumpy at the mo
I will try and put a video up
Thanks in advance
__________________

__________________
popeyethesailor is offline   Reply With Quote
Old 22 March 2015, 12:27   #2
Member
 
Country: UK - Scotland
Town: Denny
Boat name: Hebridean Storm
Make: Coastline
Length: 6m +
Engine: Honda 130hp
MMSI: 235107505
Join Date: Mar 2013
Posts: 835
Hi

If you're running it on muffs and a hose it'll "spit and fart" a bit. If you can get it in a test tank that's deep enough to replicate the depth that the engine will be at on the back of the boat you'll get a better idea but don't expect it to be silky smooth. Two strokes don't like idling.
__________________

__________________
Last Tango is offline   Reply With Quote
Old 22 March 2015, 12:34   #3
Member
 
popeyethesailor's Avatar
 
Country: UK - England
Town: St Neots ( Cambs)
Boat name: Red Oktober
Make: Avon SR4
Length: 4m +
Engine: 40hp
Join Date: Aug 2013
Posts: 116
http://youtu.be/7gU3I4d9Cd8
__________________
popeyethesailor is offline   Reply With Quote
Old 22 March 2015, 12:36   #4
Member
 
Country: UK - Scotland
Town: Denny
Boat name: Hebridean Storm
Make: Coastline
Length: 6m +
Engine: Honda 130hp
MMSI: 235107505
Join Date: Mar 2013
Posts: 835
Maybe idling a bit slow but sounds ok.
__________________
Last Tango is offline   Reply With Quote
Old 22 March 2015, 12:36   #5
Member
 
popeyethesailor's Avatar
 
Country: UK - England
Town: St Neots ( Cambs)
Boat name: Red Oktober
Make: Avon SR4
Length: 4m +
Engine: 40hp
Join Date: Aug 2013
Posts: 116
Quote:
Originally Posted by Last Tango View Post
Hi



If you're running it on muffs and a hose it'll "spit and fart" a bit. If you can get it in a test tank that's deep enough to replicate the depth that the engine will be at on the back of the boat you'll get a better idea but don't expect it to be silky smooth. Two strokes don't like idling.

Hi thanks for that I have had it in a tank today and re adjusted the mixture and sprayed some carb cleaner in and maybe slightly better then in this vid
__________________
popeyethesailor is offline   Reply With Quote
Old 22 March 2015, 12:49   #6
Member
 
popeyethesailor's Avatar
 
Country: UK - England
Town: St Neots ( Cambs)
Boat name: Red Oktober
Make: Avon SR4
Length: 4m +
Engine: 40hp
Join Date: Aug 2013
Posts: 116
Quote:
Originally Posted by Last Tango View Post
Maybe idling a bit slow but sounds ok.

Hi thanks I have increased the idle a little more it sounds better just goes into gear like farmer Johns tractor lol
__________________
popeyethesailor is offline   Reply With Quote
Old 22 March 2015, 12:58   #7
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,565
Quote:
Originally Posted by popeyethesailor View Post
Just a general question
Would you consider it normal for a mariner 2 stroke 40 to be a little 'lumpy' at idle?
Before I go and take the carb apart to give it a good clean which I am a bit reluctant to at the min as I am taking it out for the first time in a few weeks and it is working just a little lumpy at the mo
I will try and put a video up
Thanks in advance
I had a mariner 40 some years ago yours sounds ok to me mine throbbed a bit on tick over, they use to say there's only two throttle positions for a two stroke wide open and off.
Recently had an old Johnson 15hp throbbed on tick over the same sweet as when you opened her up.
I think gurnard runs a mariner 40 pm him Popeye.
__________________
jeffstevens763@g is offline   Reply With Quote
Old 22 March 2015, 13:10   #8
Member
 
Country: UK - Scotland
Town: Denny
Boat name: Hebridean Storm
Make: Coastline
Length: 6m +
Engine: Honda 130hp
MMSI: 235107505
Join Date: Mar 2013
Posts: 835
Yep. they make a fair crack going into gear on the muffs but it'll be fine once it's in the water. Not 100% sure about your specific engine but the norm is to adjust idle speed with the engine propelling the boat in the water. However if it's to low it'll stall when you put it in gear and if it's to high it'll "kick hard" when it goes into gear and it'll be difficult to pull back into neutral................really, if it sounds right it probably is right.
__________________
Last Tango is offline   Reply With Quote
Old 22 March 2015, 14:21   #9
Member
 
JamesF's Avatar
 
Country: UK - England
Town: Sidmouth
Boat name: Various
Make: Avon, Ribcraft
Length: 4m +
Engine: Mercury 40, Honda 50
Join Date: Nov 2012
Posts: 249
We've run the Mercury-badged version of that engine for years, and currently have two of them on SR4s. Both the current ones and the previous pair were exactly like that at idle. It's a two-stroke twin after all. It's a little smoother on the water, but it'll still kick a bit. All quite normal.

Going into gear tends to sound a bit agricultural, but that's normal too. It's better if you don't hesitate, just drop it straight in. There's quite a nice, positive change in resistance between selecting a gear and picking up the throttle — at least on ours — so it's quite easy to do. The couple of Yamaha and Honda throttle units I've used had a narrower idle 'detent', which was a bit harder to use.
__________________
JamesF is offline   Reply With Quote
Old 22 March 2015, 14:51   #10
Member
 
A1an's Avatar
 
Country: UK - Scotland
Town: Fort William
Make: Humber Destroyer
Length: 5m +
Engine: Yamaha F80
Join Date: Mar 2012
Posts: 2,239
RIBase
40 hp 2 stroke

Idle should really be setup with the leg in water so it has the correct back pressure.

Some manufacturers state that idle should be set with the leg in water AND in fwd gear.
__________________

__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
A1an 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 12:19.


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