Reply
 
Thread Tools Search this Thread
 
Old 20 May 2010, 08:18   #1
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
yamaha 40 firing issue

Hi there, again my engine is playing up and not running on all 3 cylinders. I have tried bleeding the carbirattors to make sure there is no gunk in them, they were fine. The spark plugs were new this year and not used much. A few mechanically minded people i know have looked at it but weren't able to sort it. I can't afford to have it repaired by the nearest mechanics as they charge rediculas amounts, and the other mechanics is very busy for a month or so. So i'm going to try and do it myself if your brains can help me.


Anybody got any suggestions on how to sort it??


Regards

Cammy
__________________

__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 20 May 2010, 09:05   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,826
RIBase
Quote:
Originally Posted by camtheribman View Post
Hi there, again my engine is playing up and not running on all 3 cylinders. I have tried bleeding the carbirattors to make sure there is no gunk in them, they were fine. The spark plugs were new this year and not used much. A few mechanically minded people i know have looked at it but weren't able to sort it. I can't afford to have it repaired by the nearest mechanics as they charge rediculas amounts, and the other mechanics is very busy for a month or so. So i'm going to try and do it myself if your brains can help me.


Anybody got any suggestions on how to sort it??


Regards

Cammy
No-you haven't given enough info.
Need to know:-

Which cylinders is it running on,
Does it have a spark on all 3 HT leads and plugs (test all on a 'known good' source, IE a cylinder that's firing)
Do you have a fuel filter/water trap?
How old is the fuel?
__________________
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 20 May 2010, 09:15   #3
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Quote:
Originally Posted by Nos4r2 View Post
No-you haven't given enough info.
Need to know:-

Which cylinders is it running on,
Does it have a spark on all 3 HT leads and plugs (test all on a 'known good' source, IE a cylinder that's firing)
Do you have a fuel filter/water trap?
How old is the fuel?

I don't know the answer to the first two questions. I have an inline fuel filter. The fuel was a few hours old when it stopped working, i have used it in other engines and it's been fine.
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 20 May 2010, 09:36   #4
mdt
Member
 
Country: UK - Scotland
Town: fife
Make: Humber / searider
Length: 5m +
MMSI: ... - - - ...
Join Date: Sep 2005
Posts: 720
Perry

I will be down this evening. will be about to give you a hand properly to see what is going on or not with the sparks etc.

__________________
The only difference between men and boys, is the price and size of their toys
mdt is offline   Reply With Quote
Old 20 May 2010, 09:41   #5
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Quote:
Originally Posted by mdt View Post
Perry

I will be down this evening. will be about to give you a hand properly to see what is going on or not with the sparks etc.

Thanks matt. What time? I won't be about for long as i have my maths exam tomorrow.
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 20 May 2010, 11:01   #6
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,650
I failed one of them a few years ago by playing around in boats the day before......

At risk of sounding like someone's dad, the rib will still be there on Saturday........
__________________
9D280 is offline   Reply With Quote
Old 20 May 2010, 11:15   #7
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Quote:
Originally Posted by 9D280 View Post
At risk of sounding like someone's dad, the rib will still be there on Saturday........
Care to explain?
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 20 May 2010, 11:25   #8
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,650
give it another 25 odd years and all will become clear........
__________________
9D280 is offline   Reply With Quote
Old 20 May 2010, 11:28   #9
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Quote:
Originally Posted by 9D280 View Post
give it another 25 odd years and all will become clear........
Erm ok
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 20 May 2010, 17:35   #10
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,762
RIBase
Quote:
Originally Posted by camtheribman View Post
Hi there, again my engine is playing up and not running on all 3 cylinders. I have tried bleeding the carbirattors to make sure there is no gunk in them, they were fine. The spark plugs were new this year and not used much. A few mechanically minded people i know have looked at it but weren't able to sort it. I can't afford to have it repaired by the nearest mechanics as they charge rediculas amounts, and the other mechanics is very busy for a month or so. So i'm going to try and do it myself if your brains can help me.


Anybody got any suggestions on how to sort it??


Regards

Cammy
First thing to do is check you're getting a spark on all cylinders. Rough idling could be a number of factors, either fuel related, in the respect of the fuel itself, the carburettors, fuel pump, etc. Because it's running on at least 2 cylinders - it seems to be electrical related, and not necessarily fuel starvation.

Check for a spark first. No spark, and I'd look for loose electrical connection. Just checked my manual - this relates to the ignition coil, source coil and pulsar coil. In addition, check the connections to the CDI unit are in good condition.
__________________
spartacus is offline   Reply With Quote
Old 20 May 2010, 17:40   #11
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Quote:
Originally Posted by spartacus View Post
First thing to do is check you're getting a spark on all cylinders. Rough idling could be a number of factors, either fuel related, in the respect of the fuel itself, the carburettors, fuel pump, etc. Because it's running on at least 2 cylinders - it seems to be electrical related, and not necessarily fuel starvation.

Check for a spark first. No spark, and I'd look for loose electrical connection. Just checked my manual - this relates to the ignition coil, source coil and pulsar coil. In addition, check the connections to the CDI unit are in good condition.
Thanks for the help, i will go tinker tomorrow evening.

Cammy
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 20 May 2010, 19:05   #12
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,826
RIBase
Quote:
Originally Posted by camtheribman View Post
Thanks for the help, i will go tinker tomorrow evening.

Cammy
Find out exactly what model it is.If it's a spark related issue, I should have the CDI and coil test procedures/figures around somewhere. You'll need to know how to use a multimeter though.
__________________
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 21 May 2010, 03:04   #13
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Quote:
Originally Posted by Nos4r2 View Post
Find out exactly what model it is.If it's a spark related issue, I should have the CDI and coil test procedures/figures around somewhere. You'll need to know how to use a multimeter though.
I know it was made in 1990 if that helps, i know how to use one of those, we use them in physics


Cammy
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 21 May 2010, 06:24   #14
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,762
RIBase
Quote:
Originally Posted by camtheribman View Post
I know it was made in 1990 if that helps, i know how to use one of those, we use them in physics


Cammy
Start with the CDi and charge coil as they are easily accessible. You will need figures from workshop manual to test. Failing that the pulsar coil is located under the flywheel - but you need a special tool to hold the flywheel and another one to extract it. The pulsar coil is expensive, so more than likely you'll have to source it second hand, however cross that bridge last.

Read a post somewhere on a Yammie 90hp that wasn't sparking on number 3 cylinder and the CDI and charge coils checked out okay. The fault was eventually traced to the pulsar coil.
__________________
spartacus is offline   Reply With Quote
Old 15 July 2010, 06:31   #15
Member
 
Country: Australia
Length: 4m +
Join Date: Jul 2010
Posts: 2
Hi Spartacus,

I have a 40 Veto that i am having similar problems with, i was wondering if you have the figures to test the CDI unit?

My outboard has run poor since i bought the boat.

I found two pilot Jets were missing in two of the three carbies. I took the boat out to find once jets were replaced to find it was still running rough ( no power, hard to start, poor idle excessive fuel consumption )

Then all of a sudden the motor sprung into life while at 3/4 throttle, this has since been sporadic and the motor still runs poor at times. Have been told it may be the CDI unit which is unservicable.

Any help would be greatly appreciated

Phil
__________________
Philozzie is offline   Reply With Quote
Old 15 July 2010, 07:34   #16
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,650
[QUOTE=Philozzie;360777]
Then all of a sudden the motor sprung into life while at 3/4 throttle, this has since been sporadic and the motor still runs poor at times. [QUOTE]

Intermittent stuff is most likely to be electrical. Even stuff as simple as a damp coil drying out as the engine warms up. There are a remarkable amount of connectors between the trigger coils and the spark plugs. A dodgy connection on any of them will cause it to run rough.

[QUOTE=Philozzie;360777]
Have been told it may be the CDI unit which is unservicable.
[QUOTE]

Yep, so they can charge you bucketloads of cash to supply a new one!
__________________
9D280 is offline   Reply With Quote
Old 15 July 2010, 07:42   #17
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,650
Quote:
Originally Posted by camtheribman View Post
I know it was made in 1990 if that helps,
Did you ever get it running?

Easiest way to find out which cyl isn't firing on a 2 stroke is run it for 5 mins and then take the plugs out. The manky oily one is the one that ain't working.

Simple / cheap way to find a duff electrical ignition component is once you have a plug oiled up, clean it, and swap it with one of the others. Run for 5 mins, see if the oiled plug follows the plug. If yes, the plug is gubbed. If not, clean the plug again move one component back in the system (HT lead , may be part of the coil assy, whatever is next) and swap them. Once again, if the oily plug moves, that's your duff part, if not, clean it & carry on 'till you run out of things to swap.

Worth going through with WD40 and cleaning all connections first tho'.
__________________
9D280 is offline   Reply With Quote
Old 15 July 2010, 10:22   #18
Member
 
camtheribman's Avatar
 
Country: UK - Scotland
Town: fife
Boat name: top dog
Make: avon searider
Length: 4m +
Engine: yamaha 40
Join Date: Jun 2009
Posts: 282
Send a message via MSN to camtheribman
Yeah she was running beautiful thanks to david anderson marine. But someone then put a fair bit of water into the fuel so i just have to clean the filters now.
__________________
Yawn :O
camtheribman is offline   Reply With Quote
Old 15 July 2010, 17:25   #19
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,762
RIBase
Quote:
Originally Posted by Philozzie View Post
Hi Spartacus,
I have a 40 Veto that i am having similar problems with, i was wondering if you have the figures to test the CDI unit?
Phil
Sorry, no. Used to have a mint 1995 Yamaha 40V 3 cylinder outboard, but sold it. You can pick up a workshop manual of Ebay.
__________________

__________________
spartacus 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




All times are GMT -5. The time now is 07:35.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.