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Walt Oler
1st Mate

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USA
44 Posts
Initially Posted - 01/04/2009 :  21:55:49  Show Profile  Visit Walt Oler's Homepage
I have a Mercury 9.9 hp 2 cycle that is giving problems. It starts and seems to idle ok but stutters when trying to increase power and then dies. I changed spark plugs which seemed to help but the same problem occured the next time out. The spark plugs I removed were oily but not fouled. Is this a carburetor mixture setting problem?
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PJohnston
Deckhand

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USA
15 Posts
Response Posted - 01/04/2009 :  22:28:39  Show Profile
Walt,
I'm no expert by any means, but I recently had a similar problem with my Suzuki 2 stroke. I started the same way as you (changing spark plugs), but found it to be a fuel starvation problem. The male fuel connector plug on the engine side contains a check valve (ball & spring) that was malfunctioning and wouldn't keep a steady suction of fuel going to the motor. I would start there.....unhook the fuel line going to the filter and squeeze the bulb to see if you are getting fuel through all the connections. Hope this helps......
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 01/05/2009 :  09:17:25  Show Profile
There are ignition possibilities other than plugs, but they are not easily addressed. If it is a sudden onset, I usually change plugs then follow the fuel:
1. clean fresh fuel and clean tank (crud builds up and clogs jets. relief valve on tank, if
equipped, open
2. fuel connectors secure at both ends and no leaks in line or connectors.
3. inline filter/ water trap clean. If you don't have one, you should add it.
4. engine mounted filter, if equipped, clean
5. carburetor bowl drain, remove and blow out jets with compressed air.
6. take engine home and start trouble shooting from 1.
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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 01/14/2009 :  14:12:29  Show Profile  Visit DaveR's Homepage
I've had the fuel line problem. It might look perfect and be fairly new but if there's too much line stress on the connection it can damage it and won't seal. Also had the carb thing as a result of old gas. Don't just blow out the jet (with compressed air)take the carb completely apart and hit every hole with that air. Look out for loosing the jet seat (not all carbs hav'em but many do).
These little engines are fairly straight forward. Usually if it won't run it's either no air, no spark or no gas. Walt, with your problem it sounds like a good carb cleaning should do the trick.
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 01/14/2009 :  18:04:49  Show Profile  Visit delliottg's Homepage
One thing I've had bite me is forgetting to open the vent in the top of the tank. My fairway's fairly short and I've had the engine stall out only halfway up it from fuel starvation. Opening the vent solved the problem in seconds with a couple of squeezes on the bulb.
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Walt Oler
1st Mate

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USA
44 Posts
Response Posted - 01/19/2009 :  20:36:30  Show Profile  Visit Walt Oler's Homepage
I am embarrassed to admit it but the fuel tank vent was the problem. After searching for solutions online, I realized that I had forgotten to open the vent. But, after opening it, the problem was still there. We were back in Corpus this weekend and I discovered that I needed to back the vent all the way out for it to allow enough air in. I gave the motor a 20 minute run in the slip, stopped it and restarted it several times and all seemed to be good. We went out Saturday and Sunday with no problems. Hurray!!
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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.