1. Introduction

A carburetor is a small engine that usually is found on classic motorcycles. Its function is to control the flow of fuel and air into the cylinder, which makes sure the whole machine operates properly. Since it’s an indispensable part, a damaged or filthy carburetor can intensely impact on the machine performance, somethings, cause to stop working.

However, because carburetor is very complicated, sanitizing it is not easy at all. Here, we offer you a step-by-step guide with full of illustrative pictures to show you how to clean a carburetor. There’s no reason for you to ignore this post.

Note: The carburetor we used in this guide is a WR250F (2007). Your device could be different.

2. Before Starting

Read the Manufacturer Manual

Carburetors come in a variety of shapes, sizes, and components. For example, the carburetor in a motorbike is much different in comparison with the carburetor in a quad. Even though in the same type of vehicles, they’re mostly not exactly the same.

As a result, it’s essential for you to read the service manual thoroughly, or at least, skim it to determine the differences between our tutorial and yours. Besides, the manual will reveal you what tools and how their sizes that you need.

Necessary Equipment

Collect the following tools before getting started. You might lack several of them, but it’s best to buy whatever you’re missing.

Via: http://www.instructables.com/

  • Carburetor and choke cleaner
  • Rags
  • Hex key set
  • Wrench
  • Socket Wrench
  • Screwdriver

3. Disassembly

Disassembly is the only way to clean each separate component. You can either sanitize each component as taking out or clean them after removing them all.

Step 1: Remove the carburetor from your motorcycle

Refer to your manufacturer manual.

Step 2: Clean the outside surface

Before disassembling anything, use a carburetor and choke cleaner to spray off your device. It’s crucial to blow away all the dirt on the outside.

Rub off all the stains with a rag.

Step 3: Remove the slide valve

Detach the valve lever housing cover by unscrewing a couple of bolts holding it on. To do that, use the screwdriver and rotate in a counter-clockwise direction.

Next, remove that throttle shaft screw which is covered by the housing cover.

When you’ve done, spin the control arm and elevate the slide up.

Now you can take the slide valve out from a hole.

Also, take a look at the hole; if there is an O-ring, turn the carburetor upside down and take it out.

Step 4: Remove the accelerator pump

First, unscrew the fuel bolt.

Then, do the same with three bolts that keep the accelerator pump cover.

Now, take the cover out. You’ll see a spring behind. Again, take it out.

Under the spring, there is a diaphragm. Lightly pull it out. It’s best to note the direction as you remove it so that you get no confusion when reinstalling it later.

Step 5: Remove the float assembly components

Use the wrench to loosen the float bowl plug. Take it out.

Now you can see the pilot jet and main jet.

Next, use a hex key and remove the float bowls. There are totally four bowls located at four sides of a rectangle.

You remove them all to open the box.

Then, push the float pin out of the way.

Now, you can take the float assembly out of the carburetor.

Remove the float needle from the float.

Step 6: Remove the jets

Use the socket wrench to loosen the main jet. Rotate it in a counter-clockwise circle.

Pull the jet out.

Next, take the plastic spacer out.

Then, remove the pilot jet as the same way as you remove the main jet.

Do the same with the starter jet.

Step 7: Remove the air cut-off valve components

Since not all the carburetors have an air cut-off valve, you just perform this step if your device has. We continue to perform a very familiar procedure, remove all the screws and bolts. There are two.

Now, take the cover out. Don’t forget to remove the spring and the diaphragm underneath.

Step 8: Remove the choke assembly

Remove the choke plunger with the wrench. Then take the assembly out.

4. Cleaning

Move to our main stage - cleaning your carburetor. Since your cleaner has a small red hose, make sure you take full advantage of it to spray in every corner and gap to blow away all the dirt. For hard stains on the outside, the rag is the best solution to rub them off.

Step 1: Clean the carburetor body and sides

What will you spray? Valves, jets, choke assembly, inlet, slide, etc. In short, everything!

Step 2: Clean the components that you removed

You can use the cleaner to spray most items. However, for fragile ones such as the O-rings and diaphragms, just wipe them very gentle with the rag. Why? Because the water pressure and speed from the cleaner is quite significant. This strong stream can damage these parts.

Clean the slide assembly and its wheels.

Clean the float bowl.

Clean the housing cover.

Clean the accelerator pump cover and the air-cut valve cover.

5. Reassembly

Go to the final stage. It’s time to reinstall everything that you removed.

Step 1: Reassemble all the jets

Drop each of them into place and tighten it completely before going to the next jet. One thing to note is trying to tighten each jet as much as it can go, but don’t overtighten, which can break it off.

The leak jet

The starter jet

The pilot jet

The plastic spacer

The needle jet

The main jet

Step 2: Reassemble the float bowl

First, handle the float needle. It need a super exact location, so make sure you place it carefully into the hole.

Set the float down into the carburetor

Bring the float pin into place.

Bring the float bowl back to the carburetor.

Tighten all the bolts.

Step 3: Reassemble the accelerator pump assembly components

Deal with the diaphragm first. Then the spring.

Next, all the screws.

Attach the float bowl plug and tighten it.

Step 4: Reassemble the air cut-off valve components

The small O-ring

The diaphragm

The air cut-off valve spring and cover

Step 5: Reassemble the slider assembly

Attach the O-ring on the front side of the slider plate.

Install that together with the salve into the slide of your carburetor.

Push it down so that the roller fit in the slits.

Install the screw in the throttle shaft assembly.

Step 6: Reassemble the remaining carburetor components

Install the valve lever housing cover.

Step 7: Reassemble the fuel screw

Push it into the carburetor and fix it.

Step 8: Reassemble the carburetor back into your motorcycle

Refer to your manufacturer manual.


Now, you understand how to rebuild an engine by cleaning its carburetor. In fact, the sanitizing process is not too difficult; if you refer the manual in conjunction with our guide, you can do it correctly. Do you have anything to discuss us? Leave your questions or compliments in the comment section below. If you find this post useful, share it to wherever you want. Thanks!

About the Author Leroy Simmons

My name is Leroy L.Simmons. I create this blog as the way to find out my excitement and also a way to remember my father. I always love writing, I embarked on this adventure of the blog, to tell you all that I want to share about my hobby, my dream of auto, truck and journey. At MRVEHICLE.NET, I hope to tell you great stories and especially to answer some questions you might ask. And there are also many interesting and up-to-date stories of drivers on their journey everywhere in the world.

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