Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-03-2015, 15:44   #1
Registered User

Join Date: Feb 2010
Boat: Wauquiez Hood 38
Posts: 130
Trouble shooting dingy motor

My 1983 suzuki outboard (9.9 hp 2 cycle) suddenly stopped reaching full power. It starts on first pull, idles great, accelerates okay up to a point, then just kind of stabilizes well short of normal speed, running slightly erratic. The two year old plugs were really black with chunky soot, so I changed them. Also pulled carburetor and inspected float and needle valve...very clean.
My next uninformed guess is the coil is weak, and failing under heavy load. So I will try to find a replacement here in the keys, before we head to Bahamas.
In meantime, if anyone has any guidance, please let me know.
Thanks, Tom
__________________

__________________
Tom1340 is offline   Reply With Quote
Old 06-03-2015, 16:34   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,068
Trouble shooting dingy motor

Coil is possible, but does this carb have a choke or an enriching circuit. If it has the enriching circuit, that is another possibility. Good you pulled the plug, that way you know it's not going lean, which I would have guessed was the case and a plugged high speed circuit.



Sent from my iPad using Cruisers Sailing Forum
__________________

__________________
a64pilot is offline   Reply With Quote
Old 06-03-2015, 16:40   #3
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 2,737
Re: Trouble shooting dingy motor

Assuming you've already tried with a fresh fuel/oil mix, a twin cylinder 2 stroke outboard can start and run at low speeds remarkably well with one cylinder not firing at all. It just won't reach anywhere near full power and run like junk at the higher end. Pull one lead, start and run and then repeat for the other cylinder, swap plugs etc to test for plug / coil failures
__________________
Reefmagnet is offline   Reply With Quote
Old 06-03-2015, 16:50   #4
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Re: Trouble shooting dingy motor

Just fixed two yamahas with similar problems. 90 percent of the time it's the carb. Remove and clean! Especially the jets.


Toronto in summer, Bahamas in winter.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 06-03-2015, 18:56   #5
Registered User

Join Date: Feb 2010
Boat: Wauquiez Hood 38
Posts: 130
Re: Trouble shooting dingy motor

Thank you all for your comments. I hope it is a dirty carb problem, and I will go through it more thoroughly and clean the jets. Finding new coil and CDI for this vintage motor is proving a challenge.
__________________
Tom1340 is offline   Reply With Quote
Old 06-03-2015, 19:03   #6
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Trouble shooting dingy motor

Quote:
Originally Posted by Vasco View Post
Just fixed two yamahas with similar problems. 90 percent of the time it's the carb. Remove and clean! Especially the jets.


Toronto in summer, Bahamas in winter.
Ditto!
Pull the jet out of the carb and see how the metering hole looks. If its been sitting for a long time with new fuel (10% alcohol), it retains moisture and the jet clogs up with oxides.

Now days, I run my fuel systems dry for storage.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 06-03-2015, 19:04   #7
Moderator Emeritus
 
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Singapore
Boat: Maxi 77 - Relax Lah!
Posts: 11,514
Images: 4
Re: Trouble shooting dingy motor

I don't have anything useful to add except - 32 year old outboard? Wow!

Has it ever been overhauled?
__________________
Relax Lah! is For Sale <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 07-03-2015, 08:58   #8
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Re: Trouble shooting dingy motor

If you do decide on a new outboard wait till you get to the Bahamas and get another two stroke. Yamaha 15, the cruisers choice


Toronto in summer, Bahamas in winter.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 07-03-2015, 09:04   #9
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 6,066
Re: Trouble shooting dingy motor

Quote:
Originally Posted by Ex-Calif View Post
I don't have anything useful to add except - 32 year old outboard? Wow!

Has it ever been overhauled?
I had the question on the age and maybe time to replace it.

Knowing nothing about that engine, at that age does it have points? If so, I had two OMC 9.9hps. that exhibited that symptom. The first one drove me crazier thinking the points where not holding a gap. Ended up being a shot upper main bearing. Time to become the proverbial boat anchor.

Good luck.
__________________
Cadence is offline   Reply With Quote
Old 07-03-2015, 09:36   #10
Registered User
 
Scout 30's Avatar

Join Date: Oct 2014
Location: Florida
Boat: Scout 30
Posts: 2,358
Re: Trouble shooting dingy motor

Go to Boats.net. They sell parts for your motor. I've bought Honda parts from them & they are good people to work with. If you are using gas with ethanol in it that's probably your problem. Replace the jets.


1983 DT9.9ELD Suzuki Marine Outboard Carburetor Diagram and Parts
__________________
Scout 30 is offline   Reply With Quote
Old 07-03-2015, 10:40   #11
Registered User
 
anacapaisland42's Avatar

Join Date: Aug 2009
Location: Ontario, Canada
Boat: Challenger 32 1974
Posts: 294
Images: 3
Re: Trouble shooting dingy motor

Several people have commented but it should be emphasised:

if you are using gas with ethanol you should run dry.

Preferably use premium, no ethanol, gas

Bill
__________________
anacapaisland42 is offline   Reply With Quote
Old 07-03-2015, 10:51   #12
Registered User

Join Date: Feb 2010
Boat: Wauquiez Hood 38
Posts: 130
Re: Trouble shooting dingy motor

This motor has run like a charm until this week. It is clean as a new whistle and starts on first pull every time. I don't think its ever had ethanol in it. BUT that's history. The jets are clean and the motor won't reach speed. It will cost me a week and about $300 to find out if the problem is the CDI unit. I think it's time for a new motor.
Vasco, getting a new 2 cycle Yamaha in Bahamas is very appealing. But I hate to get there to find out none is available. Do you know who sells them? If so, I will check availability before heading over.
Thanks to all who've offered comments.
Tom
__________________
Tom1340 is offline   Reply With Quote
Old 07-03-2015, 11:05   #13
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 7,964
Re: Trouble shooting dingy motor

Quote:
Originally Posted by Tom1340 View Post
This motor has run like a charm until this week. It is clean as a new whistle and starts on first pull every time. I don't think its ever had ethanol in it. BUT that's history. The jets are clean and the motor won't reach speed. It will cost me a week and about $300 to find out if the problem is the CDI unit. I think it's time for a new motor.
Vasco, getting a new 2 cycle Yamaha in Bahamas is very appealing. But I hate to get there to find out none is available. Do you know who sells them? If so, I will check availability before heading over.
Thanks to all who've offered comments.
Tom
Why not just replace the CDI? Easy & inexpensive on most motors. Recently bought a new one for a Johson 15 for $45.

Then if you get to the Bahamas and don't find what you want you've got a good motor until you do.

And you get to retain the prize for oldest outboard in the anchorage! ;-)
__________________
belizesailor is offline   Reply With Quote
Old 07-03-2015, 11:44   #14
Don't ask if you can't handle it
 
sailorboy1's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: On the boat somewhere
Boat: Hunter 410
Posts: 12,326
Re: Trouble shooting dingy motor

"Trouble shooting dingy motor"

I was expecting a gun thread, but not saying that isn't the answer.
__________________
jobless, houseless, clueless, living on a boat and cruising around somewhere
sailorboy1 is offline   Reply With Quote
Old 07-03-2015, 11:59   #15
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,371
Re: Trouble shooting dingy motor

I've had your problem twice.
1) the rubber hub in t he prop was "spun"... so it wouldnt grip after I got to a higher rpm.
2) the main bearings were shot and had to be replaced.


Hopefully yours is not #2... although I had help and did it cheap like $15parts
__________________

__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Reply

Tags
motor

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Webasto TSL 17 Trouble shooting Stubop Liveaboard's Forum 2 13-01-2013 16:27
Need help trouble shooting an Inverter Shack Electrical: Batteries, Generators & Solar 15 20-03-2011 18:22
TankWatch4 Trouble-Shooting bobsadler Plumbing Systems and Fixtures 1 31-08-2010 10:12
Class on Diesel Marine Repair and Trouble Shooting Duckwheat Engines and Propulsion Systems 5 21-07-2010 08:07
Cold plate trouble shooting? Janny Plumbing Systems and Fixtures 10 26-12-2007 22:22



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:48.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.