6 Common Suzuki King Quad 300 Problems (Easy Solutions)

The Suzuki King Quad 300 is a great ATV that can take a beating and keep going!’ However, as with any motor vehicle, it can run into issues. Fortunately, most of these are minor and can easily be fixed. 

It has only had minor issues in the past. Some issues that users have complained of are issues with the engine starting, the plugs not syncing together, the vehicle frequently stopping (stalls), the fuel/air combination is not optimal, and the sensor or control circuit is not working as it should be, and the engine makes too much noise.

It’s time to discuss each issue in more detail and their solutions, so sit back and enjoy the read!

Suzuki King Quad 300 Problems

1. Engine Starting Problems:

Most users who faced engine issues complained that the engine stalled when starting the vehicle. That tends to stem from improper maintenance, engine failure, or driving the ATV dangerously. 

However, some users still complained of engine issues even after resolving all the other issues mentioned just now.

If that’s the case, then check the engine for the following:

Low compression: low compression can cause the vehicle to rev up but not start. It will make a lot of noise because the engine is being turned on, but it won’t move. 

Incidentally, compression issues can also cause rougher rides, the engine to misfire, power loss when riding, or the ATV stalling when the rider is trying to accelerate it.

Always use a mechanical gauge to see if the crank compression does everything the recommended specs in the user’s manual say it should. 

It’s necessary to check the crank compression for the following issues: 

Misplaced spark plugs, old or mistimed valves, old piston rings, a bad cylinder bore, or the starter motor cranking at turtle speed. 


You’ll need to readjust spark plugs that aren’t in the right place or position. The same is true with improperly placed or older spark plugs. 

With the case of spark plugs, you may have to replace them if you can’t repair them. You’ll need to adjust mistimed valves. 

Unfortunately, replacing the entire engine is the only solution for a bad cylinder.

2. The Plugs Don’t Sync Together:

Many users complained of plug-syncing problems. They were advised to check their plugs to see if they were bad or wet. 

Either issue will make it impossible for them to communicate with each other. They should also check the fuel tank to see if it’s guzzling more fuel when it’s being ridden. 

Engine surges when the user rides the vehicle, which can damage the plugs making two-way communication impossible!

Also, the plugs can misfire when the engine starts or is running. Other common causes of plugs not syncing together are a defective ECM, ignition coil, or CKP sensor. 

If none are issues, check to see if the open circuit is wired properly or if there is an open or short high-tension cord.


Examine your spark plugs to see if they’re malfunctioning. Malfunctioning spark plugs can give you issues when you’re trying to start the ATV. Contrary to popular belief, it’s easy to fix bad spark plugs. 

To get them working right again, you must clean them. However, sometimes even that’s not enough, and you’ll have to replace them.

Cleaning your spark plugs if we will get them to work and new again. Make sure you dry them before you put them back into the engine. 

That said if you have issues with worn out or malfunctioning ECM. CKP sensors, or ignition coils, you’ll need to go to a licensed dealer to have them replaced.

3. Stops When Ridden:

Users found it frustrating when their ATVs stopped suddenly and unexpectedly. 

They were advised to check the following in their vehicles to ensure that all are functioning optimally: a bad spark plug, a clogged fuel hose, the valves don’t empty as they should, and a bad ECM or CKP sensor.

Remember that issues with any of these can cause the engine parts to not sync and work as they should. 


Make sure to clean, and reinstall your spark plugs after completely drying them. Faulty spark plugs can and will cause your engine to suddenly and unexpectedly stall when riding it. 

You may have to replace them if they don’t work even after you have cleaned them. Always make sure you go to a licensed dealer to buy replacements.

Other possible solutions include cleaning your fuel hose, drying it, and hooking it back up to the engine. It helps if you regularly inspect your fuel hose for damage since a damaged fuel hose can cause your engine to stall. 

You’ll need to replace your ECM or CKP sensor is either faulty or damaged. That can also cause your engine to stall.

4. The Air-to-Fuel Ratio and Combination in the Engine are OFF: 

Faulty fuel-to-air ratios and combinations are unsurprisingly one of the leading causes of users’ issues with it. 

They need to check their mixtures for obstructions in the fuel filter, an improperly functioning fuel pressure regulator, a fuel pump that’s not functioning as it should, issues with the IAP sensor or circuit, issues with the IAT sensor, a thermostat that’s not working properly, or a cracked or improperly working fuel hose


Run a diagnostics test on your engine to see what’s causing your air-to-fuel ratio to be off. You may find that it’s due to a clogged fuel filter or an IAP sensor that’s not working as it should. 

If those are the issues, just detach the faulty components, clean and dry them, and reattach them to your engine. Your fuel-to-air ratio should be fine.

You may have to replace your filter or sensor if that step doesn’t work. 

Since a thorough cleaning can’t fix, you’ll have to replace any faulty pressure regulators, fuel pumps, thermostats, IAT sensors, and fuel hoses.

5. The Fuel Injector isn’t Working Properly

Note that issues with the fuel injector can cause the ATV to stall unexpectedly and suddenly when it’s being ridden. 

The issue may be nothing more than an improperly working fuel injector. 

However, that may not be the only culprit since a battery with low power and improperly functioning battery, the ECM not sending interaction signals to the engine or a short circuit or open circuit in the wiring.


You want to recharge your battery if it’s low on juice. That will get your ATV revving up to full speed in no time. 

Of course, you’ll have to replace the battery if you think it’s defective. Make sure you go to a licensed dealer when doing that. 

You’ll need to replace your fuel injector if you think that’s defective. 

If a short or open circuit is causing the issue, then you want to take your ATV to the repair shop. The same is true if the ECM is defective. 

Only an expert can tell you if the circuit or ECM can be repaired or needs replacing.


Take your ATV to the dealership. You want to have an expert run diagnostics on it to determine what could be causing problems with the control circuit

You’ll need to go to a licensed shop to replace the faulty part with a genuine component to have your ATV running and new again.

6. The Engine Makes Too Much Noise:

Many users complain that their engine’s valves, pistons, crankshaft, transmission, or water pump may be too noisy. 

It’s possible to troubleshoot the issue by doing the following: check the engine valve to see if it clears the way it should make sure the valve springs are intact and in good shape, and make sure that the tappet or cam surface is in good condition, and check that the camshaft journal is not burnt or worn out.


If the valve springs, cam surface, tappet, or camshaft journal aren’t functioning optimally, you must go to a licensed shop to get authentic replacement parts

You can adjust the engine valve to ensure it runs quietly when operating the ATV.

Warranty and Recalls for Suzuki King Quad 300

It comes with a two-year warranty. You can put as many miles on it as you want, and you won’t pay for dealer repairs during the warranty coverage period. 

Note that there may be certain exclusions stemming from wear and tear conditions.

The warranty covers material and workmanship due to normal use. However, you are alone when procuring the parts needed to replace worn-out parts.

The 2016 Suzuki King Quad 750 has been subjected to a recall because of potential crash hazards. 

The main issue is that the battery can stop working while riding the ATV. That can lead to potentially deadly crashes due to the engine stalling! Suzuki did pay for repairs to recalled vehicles to make them safer to drive.

Frequently Asked Questions

Does every wheel have a disc brake?

Only the rear wheels have a drum brake. The brake works the same way the drum brake would work on the wheel of any vehicle.

Can you drive the Suzuki King Quad 300 on sandy areas?

You can, but only if you use low-ground pressure fat tires.

Can you drive the ATV over hilly areas?

Yes, you can.

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The Suzuki King Quad 300 is a great ATV that can take a beating and keep going!’ However, as with any motor vehicle, it can run into issues. Fortunately, most of these are minor and can easily be fixed.

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