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How Can I Get More Power Out of My Kohler Engine?

An engine’s efficiency depends on the internal structure, fuel type, compressor, mechanism, and many other factors. Kohler’s engine has proved its competence in different equipment. However, a slight mismatch or improper maintenance can lead to decreased power or even engine failure.

To increase the power and get the optimal output, it’s better to examine and go through the parts one by one. Besides, the compression ratio plays a major role in the case. Your discretion and sincerity in upkeep can make your Kohler’s engine better than ever. 

How Can I Get More Power Out of My Kohler Engine?

How Can I Get More Power Out of My Kohler Engine

More power is always a yearning. More power makes any engine more efficient. There are some ways to utilize this benefit and make your Kohler engine more flexible. As follows, these engines are greatly popular due to their versatility and proficiency. 

Demand & Technology

“Today’s machines are much cleaner and more efficient than in the past. We’re especially seeing growing demand for propane-powered equipment on the commercial side,” says Kris Kiser, president, and CEO of the Outdoor Power Equipment Institute.

Therefore, Kohler engines have always been on top of the list as they provide high-performance, reliability, durability, and efficiency. “Consistent power is the defining characteristic of all our products, which are proven to go from zero to full load with only a market-leading 10 percent drop in rpm,” claims Brian Melka, vice president of Kohler Engines Americas.

The Kohler Command PRO EFI (Electronic Fuel Injection) engine delivers maximum fuel efficiency and decreases emissions. The unique attribute is the oxygen sensor. 

It analyzes the fuel and air mixture in the muffler. Because of the extensive demand for engines that run on alternative fuels, Kohler recently broadened its EFI offering to contain propane and flex-fuel models.

Area of Utilizations 

Kohler engines contribute to an expanded array of equipment including commercial landscape, industrial construction, lawn and garden, golf course maintenance, power generation, agricultural and recreational applications. These natural gas, gasoline, and propane-powered engines are suitable with many dominant manufacturers of outdoor power machinery. 

The Causes of Decreased Power

These engines can lose power under load. There are some reasons behind it. The causes could range from defective spark plugs to a filthy fuel line to false oil levels. Carburetion, compression, and ignition together run an internal spark combustion engine. If any one of these lags behind, you’ll see a drastic fall in power. 


Carburetion is when a sufficient amount of fuel and air enters an engine evenly. A disturbed carburetor may not run so well on an engine with a stock size, smaller intake valve as there’s simply not adequate engine vacuum upon acceleration to evoke the fuel from the main nozzle.

Ignition Timing

If the ignition timing is not advanced enough, the engine starts losing power. Worn point lobes on the camshaft can also be the reason for decreased power.


Compression is when the fuel or air mixture is sufficiently pressurized on the compression stroke. If the compression ratio and combustion chamber pressure are low, it can lead to less power. 

Means to Increase Power 

You can increase the compression ratio or some other factors to increase the engine’s power under load. Also, less power is the result of some internal problems as mentioned in the previous section. Try to troubleshoot those problems to get the maximum output.

Check the Fuel & Fuel line 

Sometimes the wrong fuel level can be the reason for a bored-out engine. Check if you have enough fuel. Also, ensure if you’re using the perfect fuel for your equipment. 

Once you’ve made sure that the fuel is right, divert your concentration on the line. Sometimes dirt, debris, and filth in the fuel line cause the lower performance of the machine. Turn off your machine and depart the fuel line from the tank. 

Check if the line or tank has any leakage or if they are torn out. if your fuel line is very old, it’s better to change it with a new one. Clean out the dirt and assemble them as before.

Check the Fuel & Fuel line

Examine the Spark Plugs

Spark plugs are quite sensitive to use. You have to replace them every season or after every 25 hours of use in standard lawnmowers. Disconnect the plug and clean the areas around it to prevent getting dirt in the chamber. Make sure your spark plug is not wet or has cracks. If so, never use it again. Also, don’t over-tighten your spark plug. 

Examine the Spark Plugs

Check the Air Filters.

Before air enters the carburetor, it goes through a filter. This is the air filter that traps dust and other debris. If there’s a filthy air filter, it could lead the engine to sputter intermittently and die. Like spark plugs, you should replace air filters every season or after every 25 hours of use.

If the air filter consists of pleated paper and it becomes dirty, you have to replace it instantly. But if it consists of foam, you can clean it with warm water and mild detergent before reusing it. 

Check the Air Filters.

Examine the Battery

If you’re using any machine which runs on a battery, it’s better to check the battery if you’re facing any problem. Check for the signs of a faulty electric system. Replace the battery if it’s unused for a long time. 

Examine the Battery

Check the Choke

If the choke is sticky and filthy with oil and debris, it will not open. It hampers the air and gasoline movement in the carburetor. Thus decrease the performance of the engine. In this case, take a rag and wipe the choke and its surrounding linkages. For maximum results, spray carburetor cleaner along the shaft to get rid of grit and grime. 

Check the Choke

Increase the Compressor Ratio

Approximately 48% more horsepower and torque can be formed from a basically “stock” single cylinder flathead Kohler engine. It means that about 15hp can be produced from a 10hp, 17hp from a 12hp, 20hp from a 14hp, and 23hp from a 16hp governed engine at 4,000 rpm. To increase the power output, the compression ratio must be increased. You can also read about how to fix the governor on the Kohler engine.

Increase the Compressor Ratio

Add 1 point to the compression ratio when it will pop the piston out of the cylinder .020″. Also mil of the stock (OEM) head .050″. These modifications will result in a power increase. 

While reinstalling a used piston or rings, oil the rings and install the piston with the ring gaps set 180º apart. If the engine smokes, it’s better to replace the piston with an OEM or Mahle piston. Mahle piston is better for pulling competitively. 

Polish the exhaust and intake ports. Grind the intake port so that it remains the same diameter as the carburetor throttle bore. Just clean up the exhaust port and depart any rough casting slag. Carry on a quality valve job. Swirl-polish and undercut the intake valve head. then grind a 30º angle on the face of the intake valve. 

In this way, more air or fuel will enter the combustion chamber. For the exhaust to exit the chamber faster, undercut and grate a 45º angle on the exhaust valve head. To prevent valve float and reduction of engine power above 4,000 rpm, use the “lightweight” valve springs.


What are the ways to maximize the life of my Kohler engine?

To keep the engine working at its highest performance, make sure to maintain the air filter, oil, and cooling system properly as outlined in the manual. 

What fuel is suggested for the engine?

It is suggested to use unleaded regular gasoline with a pump sticker octane rating of 87 or higher. For oxygenated fuel, blends containing a maximum of 10% ethanol or 15% MTBE are enough. Fuels with higher concentrations and methanol blends are better to avoid. Use the same type of diesel fuel as one uses in cars. Dirty diesel and mixtures can cause serious damage.


Kohler engines have been serving with integrity for years. Like any other type of machinery, it’s normal to face some disturbance in power and performance. No additives are needed to enhance the engine. However, following the recommended steps above, hopefully, you’ll be able to boost the power. 

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