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Evinrude 15 HP questions

R

rsharries

New member
Hi all,
I recently picked up a 14' Klamath with an '88 Evinrude outboard (Serial # = E 15 R CC S), I am new to outboard motors and am curious of the functionality of two motor adjustments.

The first is a rotating knob protruding from the throttle . What is this to be used for?

The second is a dial knob between the choke and rope pull. what is this for?

see pictures for reference.

Any help/guidance for specific operating conditions would be appreciated.
 

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The dial knob on the end allows you to adjust low speed RPM.-----The other knob is the low speed , idle fuel / air mixture control.----If you just picked this motor up, I suggest a new water pump impeller.------What is this motor doing / not doing ?
 
Thanks Racerone,
I did replace the impeller as the water pump was not initially working. Turns out there were bits of rubber blocking the cooling water passage in the theromstat. It is cooling well now. The motor is working well at low speeds, though not super smooth. After running at high RPM for ~5 minutes it stops quickly, doesn't sputter, just stops...

I have heard that perhaps i should replace the carb (?)
 
Start with a compression test and post the actual values.-----No such thing as having to replace the carburetor on one of these motors !
 
Will do Racerone,
I don't have this tool, but I see a kit on Amazon for ~20 bucks. Is this cheap kit a waste of money or is it sufficient for the limited use it will get? I am assuming that I am looking for pressure generated by piston rings (?)
 
It may, or may not work. I went through two Amazon testers that didn’t work. In most cases, you can use the fittings/hose from the kit & replace the actual gauge with a quality one.
 
Find an Auto parts store with a loan a tool program. They usually will get you one for free just need to leave a deposit.
 
I borrowed a good compression testing tool and found the upper cylinder #1 to be 95 psi and lower cylinder #2 to be 100 psi after 8 pulls. these results were confirmed after 3 tests. the plug gap is consistent 0.032" (if that matters).
 
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