Kawasaki FX850V Problems : Troubleshooting & Fixes

The Kawasaki FX850V is a powerful vertical shaft engine designed for a variety of things including riding lawnmowers, utility vehicles and garden tractors. With its durable construction and high-performance capabilities, the Kawasaki FX850V has become a popular choice among professionals and homeowners alike. This doesn’t shield the Kawasaki FX850V from having problems however and today we’ll be taking a look at what some of those problems are and how to troubleshoot them. Let’s find out more.

Table of Contents

What Is The Kawasaki FX850V?

The Kawasaki FX850V is a 31 horsepower engine that delivers exceptional power and torque. It features a V-twin design, with two cylinders arranged in a V configuration, which provides smooth operation and improved fuel efficiency. With its electric start system and dual element air filter, the Kawasaki FX850V is easy to maintain and operate.

Kawasaki FX850V Problems

1. Engine Starting Problems

If you’re experiencing difficulties starting your Kawasaki FX850V engine, then you probably have a problem with the;

  • Battery
  • Spark plugs
  • Fuel line or fuel filter

Troubleshooting Engine Starting Problems

  • You first need to check the battery to ensure it has enough charge. Try charging it or replacing it with a new one.
  • Also inspect the spark plugs to make sure they are clean and in good condition. If the spark plugs are dirty or worn out, replace them with new ones.
  • Also check the fuel line and fuel filter for any clogs or obstructions and if the fuel line or filter is blocked, clean or replace them.
  • Make sure that the choke is functioning properly and that the throttle is in the correct position.

2. Overheating Issues

Overheating is a common issue in small engines like the Kawasaki FX850V and the main culprits are usually;

  • A faulty cooling system
  • Low coolant levels
  • A clogged air filter

Troubleshooting Overheating Issues

  • Start by checking the cooling system this means inspecting the radiator for any leaks or damage and cleaning it.
  • Also check the coolant level and add more if needed.
  • Remove the air filter and clean or replace it if it’s dirty.
  • It is also very important to make sure that the engine is not overloaded or running at high RPMs for extended periods of time, as this can contribute to overheating.
  • If the problem persist then it may be necessary to consult a professional Kawasaki engine technician for further diagnosis and repair.

3. Fuel-Related Problems

Fuel-related issues can occur in any engine, including the Kawasaki FX850V. If you’re experiencing problems with fuel delivery, then you may have a problem with;

  • The fuel tank
  • Clogged fuel lines/ filter
  • A dirty/ clogged carburetor
  • A faulty fuel pump

Troubleshooting Fuel-Related Problems

  • Start by checking the fuel tank for any contaminants or debris and when you find any, you should clean the tank and replace the fuel with fresh/ clean gasoline.
  • Also inspect the fuel lines and fuel filter for any clogs or obstructions and if it is necessary, clean or replace both these components.
  • Also check the carburetor for any dirt or buildup and if the carburetor is dirty, you should clean it thoroughly using carburetor cleaner.
  • Make sure that the fuel pump is functioning properly. If the fuel pump is faulty then it may need to be repaired or replaced.

4. Oil Leakage Problems

Oil leaks can be a frustrating and messy problem in any engine. If you notice oil leaking from your Kawasaki FX850V engine, then you may have an issue with;

  • A loose oil drain plug
  • A worn oil pan gasket
  • Worn-out seals or gaskets

Troubleshooting Oil Leakage Problems

  • You should make sure that the oil drain plug and oil filter are properly tightened and not damaged. If the oil drain plug or oil filter is loose or damaged then you should tighten or replace them.
  • Also check the oil pan gasket and valve cover gasket for any leaks or cracks and if you find any damage then replace the gaskets to prevent further leaks.
  • Also inspect the oil seals and gaskets around the crankshaft and camshaft, if these seals or gaskets are worn or damaged, they may need to be replaced to stop the oil leaks.

5. Performance Problems

If your Kawasaki FX850V engine is not performing as expected; like having low power output, there are several potential causes to consider like;

  • A clogged air filter
  • Faulty spark plugs
  • A faulty ignition system

Troubleshooting Performance Problems

  • First you need to check the air filter to ensure it is clean and not clogged because a dirty air filter can restrict airflow to the engine and reduce performance therefore you need to clean or replace the air filter if necessary.
  • Be sure to inspect the spark plugs for any signs of wear or fouling so if the spark plugs are worn or dirty, replace them with new ones.
  • Also check the ignition system for any faults or malfunctions and if the ignition system is not functioning properly then it may be good to repair or replace it.
  • Make sure that the engine is properly tuned and adjusted according to the Kawasaki’s specifications, otherwise you risk having such or more performance problems.

How To Avoid Kawasaki FX850V Problems

  • Be sure to change the oil and oil filter regularly according to the manufacturer’s recommendations because fresh oil helps to lubricate the engine and prevent premature wear.
  • Clean or replace the air filter as needed to ensure proper airflow and prevent debris from entering the engine.
  • Check the spark plugs regularly and replace them if necessary. Worn or dirty spark plugs can cause misfires and reduce engine performance.
  • Also inspect the fuel lines and fuel filter for any clogs or obstructions. Clean or replace these components as needed to ensure proper fuel delivery.
  • Keep the cooling system clean and free from debris. Regularly check the radiator for any leaks or damage and clean it regularly as well.

How Often Should I Change The Oil In My Kawasaki FX850V Engine?

The oil in your Kawasaki FX850V engine should be changed every 50-100 hours of operation or at least once a year, whichever comes first. It is worth noting that regular oil changes help to maintain proper lubrication and prevent engine damage.

Can I Use Ethanol-blended Gasoline In My Kawasaki FX850V Engine?

Kawasaki recommends using gasoline with no more than 10% ethanol (E10) in their engines. Higher ethanol blends can cause damage to the fuel system and thus cause performance issues. It’s best to use ethanol-free gasoline whenever possible.


The Kawasaki FX850V engine is a reliable and powerful vertical shaft engine used in a variety of applications and by following the troubleshooting steps in this article, you can be sure to address the most common issues and find solutions to keep your engine running smoothly. Kawasaki is a trusted brand that is beloved all over the world, so you can be sure that regardless of the problems you may encounter with the Kawasaki FX850V, it is still an engine worth having.