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 Your Average speed with an outboard 9.9?		  New Topic  Topic Locked
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aeckhart
Master Marine Consultant

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USA
1709 Posts
Response Posted - 12/18/2009 :  09:46:30  Show Profile  Visit aeckhart's Homepage
I've noticed this regarding my 9.9 Evinrude - same vintage and company as your Johnson. I have a 6 gallon steel tank which is fully enclosed - no pressure release which operates pefectly. I also have a 6 gallon plastic spare tank. When this tank is in use the pressure inside the tank has to be released by opening a plug. If I don't remove the plug the engine slows than stops. Once I looked down and the tank was nearly collapsed because of the fuel pump sucking gas, and air, into the engine.
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captck
1st Mate

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USA
34 Posts
Response Posted - 02/14/2010 :  06:03:09  Show Profile

check prop and rubber hub inside it around the shaft. i may be spinning shaft but not positively turning the prop. rubber may be slipping in prop.


<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Guero</i>
<br />Hello All,

I recently purchased a Catalina 25 1982, Standard Rig. It has an 2 strokes outboard Johnson Sail Master 9.9 (Unknown Year).

Yesterday, we were 6 in the boat and while motoring out of the port to the sea, I noticed that I was not doing more than 3 knots with throttle to almost 3/4 to the max.

3/4 will usually give me 4 to 4.5 kts on 3/4 throttle, on a flat, 0 wind sea.

Is my engine "tired" or this is the average performance I should expect from a Johnson 9.9?

Not that I am in a hurry but with waves on the gulf and upwind, 3/4 will give me around 3 knots.

Your opinion?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
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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.