Harley Davidson Evolution Engine Problems: What you need to know

The evolution engine is the motor of the motorcycle. It produces power transmitted to the rear wheel through a chain drive and cam-chain tensioner system. Besides producing power, it also functions as a differential for changing the speeds of the engine and wheels and ensures the smooth transmission of power to the rear wheel.

Owning an evolution-engine motorcycle allows you to enjoy high-performance riding with low maintenance costs. It is ideal for riders who love performance and adventure or want a unique piece of machinery that’s easy to maintain. Besides performance, evolution engines are also popular for their reliability.

But before you get into an evolution engine vehicle, you need to understand the common problems associated with them so that in case your bike faces any problem; you know how to fix it and what steps to take next. We have discussed common Harley Davidson Evolution Engine Problems motorcycles and how you can correct them.

Harley Davidson Evolution Engine Problems

7 Common Harley Davidson Evolution Engine Problems & Solutions To Fix Them

7 Common Harley Davidson Evolution Engine Problems & Solutions To Fix Them

There can be many problems with the Harley Davidson Evolution Engine Problems, which can be difficult to troubleshoot. However, there are some things that you can do to troubleshoot them. Several problems can occur with Harley Davidson’s evolution engine, ranging from basic maintenance issues to more serious problems.

One of the most common issues is debris in the fuel line. Debris can build up over time and restrict fuel filter flow to the engine, damaging it. Several issues could affect the terms of performance and overall reliability of your Harley Davidson Evolution. Here are seven common problems and solutions to help you solve them.

1. Low Oil Pressure

Well, low oil pressure is a common issue with the Harley-Davidson Evolution engine. Low oil pressure can lead to difficulty starting the motorcycle and, in some cases, even cause the engine to stop. The Harley-Davidson Evolution engine was released in response to customer demand and was one of the best engines that Harley-Davidson produced.

If you are experiencing low oil pressure on your Harley-Davidson Evolution motorbike, there are several things you can do to fix the problem and get back on the road as soon as possible. To fix low oil pressure in a Harley Davidson Evolution Engine, follow these steps:

  • Check the oil level
  • Inspect for leaks
  • Replace the oil filter
  • Clean or replace the oil pump
  • Check the oil pressure relief valve
  • Inspect the oil pressure sensor

2. Engine Smoking

Engine Smoking

White smoke is a common problem for Harley Davidson Evolution engines ridden for outputs of 65,000-80,000 miles. White smoke from the engine typically indicates an issue with the fuel injectors or spark plugs. Test the ignition coil to see if it’s worn out or has become dirty.

If there is a cylinder gasket leak, smoking may also result from excessive oil burning in the cylinder. Other causes of white smoke in Harley Davidson Evolution engines include a faulty EIS system that pulls in more air to cool the engine displacement and a clogged air filter.

Activating the EIT MS system can prevent overheating. This system automatically adjusts fuel delivery during high-load situations to help prevent engine overheating.

3. Cam Chain Tensioner

Cam Chain Tensioner

Harley-Davidson Evolution engines can be prone to cam bearing issue chain tensioner problems due to timing belt slipping. This results in a loud rattling noise from the engine. The cam chain tensioner must constantly work to keep the camshaft from moving back and forth, which can cause wear and tear over time.

By replacing the expensive cam chain tensioner, which is only sometimes covered by warranty, you can quickly rectify such problems. Another possible solution to this problem is installing Timken bearings in the flywheel of Harley-Davidson Evolution engines to help prevent cam chain tensioner problems. By replacing or installing these components, you can ensure that your engine issues stay running smoothly and reliably.

4. Tapping

If the tapping sound in your Harley Davidson engine issues is persistent and loud, it could be due to a loose cover of the air cleaner or a worn-out bearing on the brake lever. Ensure that you check for these possible problems by tightening all bolts and properly securing all covers.

Also, to ensure thorough engine cleaning and maintenance, replacing the oil and filter every 3 months or 12,000 miles is important. If you hear tapping or clicking noises while riding your motorcycle, you may need to have the mechanic check and adjust the valve clearance or remove carbon deposits on the piston. If you suspect a problem with your Harley Davidson engine, it is best to have it checked by a mechanic.

5. Engine Shuts Off

A defective temperature sensor can directly or indirectly cause an engine to shut off abruptly. When this sensor detects an abnormally high temperature, it automatically shuts the engine down to prevent damage. Other problems leading to engine shutdown include loose fuel pump wires, a bad wiring connection, or broken vacuum lines.

If you are experiencing problems with your engine constantly shutting down, it is best to have it checked by a professional. The problem may be more complex than you think and require multiple solutions. Replacing the temperature sensor or installing a new fuel pump may help reduce engine shutdowns. However, if the problem persists and no other solutions work, consider replacing the engine.

6. Power Loss

Power Loss

Harley-Davidson motorcycles are known for their powerful engine and smooth, comfortable ride. However, engine problems can occur. When power loss occurs in a Harley-Davidson motorcycle engine, it can be caused by a bad engine ignition problem. To fix the power loss, you should check and replace the air filter, intake manifold, and throttle body.

Other causes of engine power loss include defective crankcase breather hose or oil fill tube head gasket. Another possible cause of power loss in power of power is low oil pressure in the engine. If so, ensure your Harley-Davidson motorcycle has an oil change and check for low oil pressure or an incorrect oil level.

7. Starting Issues

Some Harley Davidson Evolution models have reported problems with the starting system. One potential issue could be a sticking fuel pump. If this occurs, try to start the bike by manually pumping the handle. If the problem persists, have an expert inspect and repair the motorcycle for free.

Other potential issues with the engine include a misfiring issue or a clogged air filter. If you are experiencing any of these issues, contact a certified mechanic to have them fixed and get your bike back on the road safely and efficiently. The proper installation of rocker gaskets is essential for preventing leaks in the Harley Davidson Evolution Engine.

Are Harley-Davidson Engines Reliable?

Are Harley-Davidson Engines Reliable

The answer largely depends on the model, but Harley-Davidson engines are generally reliable. Harley-Davidson is popular for its quality engineering and attention to detail, which means that most models are built to last.

For those who prefer to maintain their own engines, a large aftermarket of parts and accessories is available, making it easy to customize and repair your engine. Additionally, Harley-Davidson offers a limited warranty on its engine parts, so you can rest assured that you are getting a reliable product.

Harley-Davidson engines have been regarded as one of the most reliable ones on the market, especially for motorcycles. Most people agree that professional riders are known for their great handling and easy-to-maintain engines.

Maintenance Tips For The Evolution Engine

Harley-Davidson’s evolution engine features a twin-cylinder base gasket engine that delivers smooth and powerful performance. It’s essential to regularly check the engine oil level and change it when needed. Thoroughly clean the engine at least once a year with a high-quality engine oil and engine cleaning spray. Here are the tips:

  • Regularly check and change the engine oil to ensure proper lubrication.
  • Keep an eye on the engine’s cooling system and ensure that it is functioning effectively.
  • Clean and inspect the air filter regularly to prevent dust and debris from entering the engine.
  • Check the spark plugs and replace them if they are worn out or damaged.
  • Perform regular valve adjustments to maintain optimal engine performance.
  • Keep the engine and exhaust system clean to prevent overheating and improve airflow.
  • Inspect and tighten all engine mounting bolts to ensure stability and reduce vibrations.

Benefits Of Owning An Evolution Engine Motorcycle

Benefits Of Owning An Evolution Engine Motorcycle

Owning a Harley-Davidson Evolution Engine motorcycle is a great way to experience a V-twin engine’s sheer power and raw speed. An E-Twin engine’s smooth, revving tone will take you through the countryside with the wind in your hair. The high torque and smooth shifting of an E-Twin make it a great choice for long-distance riding or cruising down the open road. Here are the benefits:

  • Increased power and performance compared to older Harley Davidson engines
  • Smoother and more refined engine operation
  • Improved fuel efficiency and reduced emissions
  • Enhanced durability and reliability for long-lasting performance
  • The wide availability of aftermarket parts and accessories for customization
  • Iconic Harley Davidson sound and style
  • Strong resale value and investment potential
  • Proud ownership of a legendary brand and motorcycle heritage

What Is The Problem With The Harley Davidson Engine?

What Is The Problem With The Harley Davidson Engine

The Harley Davidson engine is known to have a design flaw in its cam chain system, which causes the plastic shoes to wear out over time. Several design problems with the Harley Davidson Twin Cam engine involve the cam chain system.

These problems can result in degraded performance, oil leaks, smoke and stalling at idle, and even bearing failure. These problems can become even worse for older engines that need to well-maintain. Bad bearings can cause vibrations, strange noises, and oil pressure drops. The weak battery in Harley Davidson Evolution engines is a common issue that many riders face.


Whether you own a Harley-Davidson motorcycle, you must know the engine evolution engine. It’s an engine that has stood the test of time and is still going strong even today. Thousands of Harleys have used these engines, and their reliability and durability have won hearts.

If you are experiencing any issues with your motorcycle engine, we encourage you to visit a professional mechanic who can diagnose the problem and help you fix it. Several Harley Davidson evolution engine problems, some more serious than others, can occur.

By understanding the various Harley Davidson-evolution engine problems and how to prevent them from occurring, you can protect your bike and keep it running smoothly. However, By following these instructions, you can ensure that your motorcycle is running smoothly and efficiently.

Frequently Asked Questions

How reliable is the Evo engine?

The Evo engine, also known as the Evolution engine, is known for its reliability. It has been a staple in Mitsubishi vehicles for many years and has a reputation for durability and performance.

How long will a Harley Evo engine last?

A Harley Evo engine can last anywhere from 50,000 to 100,000 miles, depending on how well it is maintained and how it is ridden. Regular maintenance and proper care, such as regular oil changes, can help prolong the engine’s lifespan.

Who makes Evo engines?

Evo engines are made by Mitsubishi Motors, specifically for their performance-oriented vehicles such as the Mitsubishi Lancer Evolution.

When did Harley stop making the Evo engine?

Harley Davidson stopped making the Evolution (Evo) engine in 1999.

Which is a better engine Evo or twin cam?

It is subjective to determine which engine is better between the Evo and twin cam. Both engines have their own unique features and benefits. The Evo engine, also known as the Evolution engine, is popular for its high-performance capabilities and power output.

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