I have a 27 kolher command pro on a mud motor in cold weather when i go under load only it makes a knocking noise and stalls out. it runs like ****. i have taken it places and they say theres nothing wrong because they cant put it under load but the engine is running like **** any ideas

does it stall? when does this usually happen ie: when motor is cold, humid weather or cold weather....etc

Evinrude 50 HP Bogs at WOT - MarineEngine

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Aug 6, 2002 - 17 posts - ‎3 authors
83 50 HP Evinrude - sat out in weather for 4 yrs. Been cleaning ... At WOT, she bogsdown. Up to. ... Yes, this boat/motor is new to me. Actually ... Mercury 50 1987 bogs down when full @ full throttle
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Possible, but more likely it's one of the cv joints. It may produce the same sound behavior in tight right or left turns on dry pavement. Wheel bearings may also be a problem.

there is a voltage regulator directly above the electric fuel pump on this welder, make sure the three connectors are making good contact, there are three wires attached to it, the center conductor is either violet or blue, if the spade terminals are not making proper contact your machine will shut down as you state
you may also have a "sticking" or faulty fuel stop solenoid
if after you remove and check the connectors at the voltage regulator, the problem persists, locate the local Kohler dealer, your engine has a 3 year warranty for parts and labor

Your hearing lifter noise common in most cars in cold weather I have a 2001 sc1 same engine as yours here's how to get rid of that ticking sound go buy a quart of Lucas synthetic motor treatment change your oil and leave it 1 quart low add the Lucas synthetic oil stabilizer within 1 week you will not hear the noise agian reason your hearing the noise is there's no oil at the top of the engine on a cold start oil when cold is thicker hints why your noise in your engine what Lucas does is eliminate the dry start by the way my engine has 288,000 and does not use a drop of oil after you use this product you should use it every oil change you will see your car will thank you regards Chris

Check the fuel pressure, it could be a bad fuel pump

Right front motor mount is bad ??

i would need to hear the noise to know what it is clear the garage out and park it in the garage then it will not do it

The weather you live in, oil weight being used, what type of car/truck. I'm thinking run an engine cleaner through for 5 min to clean the engine. What you are hearing is most likely a sticky valve. Drain the oil, change the filter and fill with a light oil in the cold with light loads and heavier oil in hot weather. A multi viscosity oil can be used to weigh out the cold and hot weather.

This is just a suggest, mind you, but if its still under warrenty, I would run it by the dealer, because from what you write, it sounds like a little bit of piston slap.

That engine should be tight.