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#11
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Yamaha 9.9 - thanks everyone
On Thu, 22 Jul 2004 17:09:40 GMT, "
wrote: Thank you, everyone! The problem was a plugged vent- I got it cleared last night and ran it smoothly for 15 minutes. It'll be truly fixed when you can run it for 15 NM in short chop. That loosens the flakes and debris nicely, I find G R. |
#12
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Yamaha 9.9 - thanks everyone
Ah, if you are a pessimist you are never disappointed. I write that
with the utmost respect, Rhys, because I have experienced it too many times in practice. After 7 NM with moderate waves I got the problem back again. After much more troubleshooting I found that I have a tiny oil leak somewhere. Turns out the Yamaha 9.9 is designed to drop to low RPM's and run rough when it senses a loss of oil pressure. After running at low RPM for a short while enough oil was accumulating in the reservoir to allow oil pressure to go back to normal, thus the intermittent nature of the problem. A quart of oil and 10 NM later the "effect" seems to be gone, although I still have to find the leak causing the problem. Mike rhys wrote: On Thu, 22 Jul 2004 17:09:40 GMT, " wrote: Thank you, everyone! The problem was a plugged vent- I got it cleared last night and ran it smoothly for 15 minutes. It'll be truly fixed when you can run it for 15 NM in short chop. That loosens the flakes and debris nicely, I find G R. |
#13
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Yamaha 9.9 outboard runs smooth then sputters
Factory prop or did you change it for one with a different pitch?
"rhys" wrote in message ... On Wed, 21 Jul 2004 12:06:32 GMT, " wrote: Thanks everyone! The gas was new last weekend, so I don't think that's the problem. I'll check the other things when I get back into town tomorrow. Thanks again, Mike Another possibility which happened to my four-stroke Honda 9.9 is a stuck carb float, which make for harder starts, limited acceleration and the occasional stall. It needed a good clean due to crap in the gas. Filtering the gas/cleaning the tank is always a good idea. R. |
#14
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Yamaha 9.9 - thanks everyone
On Wed, 28 Jul 2004 13:40:34 GMT, Mike_H
wrote: A quart of oil and 10 NM later the "effect" seems to be gone, although I still have to find the leak causing the problem. Interesting. Does it leak at rest or only when under load? What I am getting at is does the rising engine heat cause a gasket somewhere to fail, or is it the rising oil pressure that forces oil past a hole or gasket or crack or something that "closes" or reseats itself when the motor cools down? I'm glad you are getting closer to the ultimate problem, which isn't fuel, it seems. Believe it or not, that's a good thing G R. |
#15
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Yamaha 9.9 outboard runs smooth then sputters
I replaced the factory prop with a plastic one of the same pitch.
Mike Michael wrote: Factory prop or did you change it for one with a different pitch? "rhys" wrote in message ... On Wed, 21 Jul 2004 12:06:32 GMT, " wrote: Thanks everyone! The gas was new last weekend, so I don't think that's the problem. I'll check the other things when I get back into town tomorrow. Thanks again, Mike Another possibility which happened to my four-stroke Honda 9.9 is a stuck carb float, which make for harder starts, limited acceleration and the occasional stall. It needed a good clean due to crap in the gas. Filtering the gas/cleaning the tank is always a good idea. R. |
#16
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Yamaha 9.9 - thanks everyone
It is leaking at rest. When not running I keep it locked in the up
position and out of the water. When I put the motor down and into the water I have found a small amount of oil comes out of a timy breather hole in the upper case of the motor. I haven't had the motor in the down position long enough to determine whether it also leaks when running. My plan is to identify where the at-rest leak(s) is/are occuring, repair it/them and then look for evidence of running leaks. It'll be slow, but I know I'm making progress. Thanks, Mike rhys wrote: Interesting. Does it leak at rest or only when under load? What I am getting at is does the rising engine heat cause a gasket somewhere to fail, or is it the rising oil pressure that forces oil past a hole or gasket or crack or something that "closes" or reseats itself when the motor cools down? I'm glad you are getting closer to the ultimate problem, which isn't fuel, it seems. Believe it or not, that's a good thing G R. |
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