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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Yamaha outboard stalling - please help!		  New Topic  Topic Locked
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Lee T
1st Mate

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26 Posts
Initially Posted - 05/28/2005 :  22:01:43  Show Profile
Hi all,

I have a 2002 8 hp Yahama (high thrust, elec start). A few months ago it started to stall at random times, and has gotten steading worse. I was really hoping to get out and sail this weekend -- any advice much appreciated. More info:

-- 100 hour service done 2 months ago; I asked them to run it an extra 30 mins at different RPM, they did so and said it ran perfectly.

-- 1 month ago I bought a new Yamaha gas tank, new Yamaha gas hose, and new gas. I drained the carburetor and starting using this new setup, but it's no better.

-- It often runs for 15 or 30 minutes perfectly, then slowly starts to sputter and then dies. Sometimes it restarts and will runs again for awhile, sometimes it restarts and dies quickly, and sometimes it won't restart at all (although after 10-20 minutes later it will usually start).

-- If I pull out the choke I can almost always get it to start, although it often dies quickly.

-- Prop definitely clear; stalling occurs same in idle as in gear.

-- Interal in-line fuel filter OK - I disconnected hose at filter output and pumped a cupful of fuel thru no problem.

Many thanks!

Lee
[1975 C27 in LA]
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 05/29/2005 :  00:00:59  Show Profile
I'm guessing a bad ignition module.
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eric.werkowitz
Captain

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USA
283 Posts
Response Posted - 05/29/2005 :  10:33:10  Show Profile
As Bruce says, many of the older Yamahas have an intermittent problem caused by the ignition modules. Not sure if this problem extends to the newer models.

These engines have carb with very small jets. If choking the engines changes the symptoms (like only being able to restart when fully choked)then I'd guess that there might be some tiny bit of crud in the bowl that sometimes blocks the jet. A rebuild or at least cleaning of the carb bowl might fix it. My older Yamaha suffered similar symptoms until a carb rebuild (in fact the PO had put a piece of tape across the air intake to act as a permanent choke!)
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At Ease
Admiral

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672 Posts
Response Posted - 05/29/2005 :  14:50:08  Show Profile
I had an 8 hp Yamaha, only problem I ever had (which was similar to yours) was fuel related...it wasn't getting it. Check what Eric mentioned and all associated fuel system items.
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 05/29/2005 :  22:26:06  Show Profile
Might be stating the obvious but you do have the vent open on the fuel tank?
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Gary B.
Admiral

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USA
969 Posts
Response Posted - 05/31/2005 :  03:50:28  Show Profile
My 1999 model 9.9 high thrust Yammy just did the same thing about 3 times during a 6 hour motorboat ride up the Columbia River in little wind over the long weekend. I have two tanks but only one was aboard, but I switched hoses and never had the problem with one of them. I switched back and an hour or so later.....it quit again. It restarted okay each time, but she was hard to start in the morning....for the first time ever. I thought the fuel line was the answer, but after reading this, I am not so sure.

Please post when you make the correct diagnosis!

Good luck,

Gary B.
s/v Encore! SK/SR #685
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Lee T
1st Mate

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26 Posts
Response Posted - 06/01/2005 :  02:10:21  Show Profile
Thanks to everyone for the ideas - I was not able to get it working, but I took it into the shop today (it's still under warranty) - I will post the fix when they find it.

Best,

Lee
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At Ease
Admiral

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672 Posts
Response Posted - 06/01/2005 :  20:44:55  Show Profile
Lee...you didn't tell us it was under warranty! Had I known that, my answer would have been to take it in and let them fix it for free.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.