There are many reasons that your go-kart engine might start knocking.
Engine knock is usually caused by a lack of lubrication, but it could also be due to improper timing or the wrong octane fuel.
Engine knock can cause serious damage to your engine, so you should take care of this problem before it gets too bad! 
Learn how to fix your go-kart engine knocking problems in this article.
Check your spark plug for dirt and replace it if necessary
Most go-karts have an automatic oiler that sprays lubrication on the engine, but dirt and debris can block these nozzles.
Check your spark plug for a buildup of carbon or soot because this is also a sign that there's not enough oil in your fuel mixture.
Replace it with one from a different manufacturer if you notice differences between brands - some manufacturers design their plugs to use more or less voltage than others.
If you're still having problems with knocking after replacing the spark plug, check out our other tips below! We've got lots of ways to fix engine knock in any vehicle!
Clean the carburetor with a wire brush to remove any buildup
Carburetors are an important part of any engine - they mix air and fuel to create a combustible mixture.
Over time, dirt or debris can find its way into the carburetor and start clogging things up.
Cleaning your carburetor with a wire brush will remove this buildup so that you can fix your go-kart engine knocking problems!
Directions for How To Clean A Carburetor:
- Dilute cleaner. In a large container, mix 1 part Simple Green Pro HD Heavy-Duty Cleaner to 3 parts water.
- Clear air filter -
- Remove the carburetor.
- Remove carburetor float.
- Remove other removable components.
- Soak and scrub components.
- Rinse and dry.
- Reassemble and replace.
Adjust timing if necessary
It's not uncommon for new owners to forget how much adjusting their timing is required when first starting off as a novice driver.
If you're still having issues despite replacing everything, try adjusting your timing.
If you don't know how to do this, check out our article about it here: How to Set the Timing on Your Go-Kart.
Use a higher octane fuel if necessary
If your engine is knocking, it's possible that you're using the wrong octane fuel.
Different engines require different types of fuels - some need an 87 octane while others could use a 91 or 93.
To fix the engine knocking, try using a more powerful fuel with higher octane.
The most important thing is to know how high your octane rating can go - it will depend on your engine system and the make/model of the go-kart.
Will an oil change stop engine knocking?
An oil change will not stop engine knocking.
High octane fuel can reduce the knock, but this is only a temporary fix and should be avoided due to its high cost.
Remove the air filter and blow out any dust or debris from it
Sometimes, knocking problems are caused by clogged air filters.
Remove the air filter and blow out any dust or debris from it to remove this problem!
8 Signs Your Air Filter Needs Replacing
- Reduced Fuel Economy.
- Misfiring engine.
- Unusual engine sounds.
- Check engine light comes on.
- The air filter appears dirty.
- Reduced horsepower.
- Black, sooty smoke or flames exiting the exhaust.
- The smell of petrol when starting the go-kart.
Ensure Correct Fuel/Air Mixture
One of the things you can try is checking the air/fuel mixture.
If this is off, engine knocking can occur because there's not enough fuel in the mix! Check your owner's manual for details on how to do this.
When done properly, you should see a noticeable difference and notice that your go-kart runs faster!
Remove Carbon Buildup
A common problem among go-karts is the buildup of carbon and soot on various parts.
This can lead to engine knocking, which occurs when there's not enough oil in your fuel mixture!
Remove this by cleaning out all removable components with a wire brush until they're shiny again - you should notice an improvement right away.
You can also clean any cylinders and pistons to ensure that your go-kart is running at its best.
What causes engine knock at low rpm?
The primary cause for engine knock occurs at low rpm due to an insufficient ignition lag which gives time for a secondary flame front, leading to the knocking.
By increasing the rpm of the engine, will decrease the ignition lag and hence reduce engine knock.
How long can you drive with a knocking engine?
An engine knock can start at any time, and once it starts it could fracture the rod without a warning.
This will differ from engine to engine, so it's impossible to provide a definite answer.
Wrapping Up
Spark plugs are one of the most crucial components in your vehicle and they need to be kept clean for optimum performance.
The dirt and debris that accumulates on spark plugs can decrease fuel efficiency, cause engine misfires or lead to other expensive repairs like a catalytic converter replacement.
To keep your go-kart running smoothly we recommend you check your spark plug every time you change the oil (recommended at least once a month) and replace it if necessary.
When changing your spark plug make sure not to over-tighten it as this could damage threads inside the cylinder head which will require costly repair work such as milling down metal from the valve cover or even replacing parts with an entirely new cylinder head assembly.
Cleaning out any buildup is also important but make sure to wear protective gloves as you don't want any debris getting in your eyes.
Allowing the engine to idle for a few minutes will allow any sediment or dust that has accumulated in the air filter to drop out.
This should be done periodically if you wish to maintain the peak performance and efficiency of your go-kart's engine.
It is important not to overfill with fuel as this can lead to damage, so it is best practice when using higher octane fuels (such as premium) for filling up halfway before topping off with regular gas.
When refilling always make sure your tank is at least three-quarters full before putting on the cap!
If you have any other questions or concerns, please feel free to contact our service department for assistance.
We are always happy to help!