How To Rebuild A Motorcycle Carburetor – If you’ve bought an old motorcycle for a DIY rebuild project or want to revive a classic V-twin motorcycle that’s been sitting in your garage for years, carburetors are all varnished and need a thorough cleaning. Learning how to rebuild carbs on a motorcycle can take some learning, but it saves time and is cheaper than replacing them with new ones.
By following a few basic steps, dismantling and rebuilding a motorcycle carburetor is relatively simple, and it’s more rewarding when the bike runs smoothly afterward. Before you begin, take several precautions: Wear safety glasses and safety gloves and work in a well-lit and clean area. Here’s what you need to do to rebuild carbs on a motorcycle:
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Get your motorcycle service manual and read through it to understand the exact steps you need to take to remove and disassemble the carbs from your motorcycle. To remove the carbs, disconnect the attached lines, loosen the screws used to tighten the manifold clamps, remove the air box and push out the carburetor rack.
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The most important thing when learning how to rebuild carbs on a motorcycle is to take things slow and keep things systematic. Also, make sure you have a dedicated work space before you start disconnecting the carburetors from their racks and working on each one individually.
With your rack carburetors off the bike, begin disconnecting them by simply unscrewing them from the rigid mounting plate. In most cases you will find 2 or 4 screws holding each carburetor in place. Before you can get to each carb, you may need to remove the throttle rod and throttle shaft. Make sure you have separate containers for each carbohydrate in your workspace.
This is important because you want to keep all of the internal components of each carb with the body you disassembled. Remove any rubber parts and set them aside before using any type of cleaner. Learning how to rebuild carbs on a motorcycle is an important step, especially if your throttle discs work with a rubber diaphragm.
Be careful when removing the throttle slide, as the rubber diaphragm can stick if the bike has not been used for a long time. If the chip is stuck, you can soak it with penetrating oil or use a heat gun to apply some heat. This makes the throttle slide plates and drive trays east to rotate. Access and removal of most jets is possible from the bottom of the carburetors.
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Remove any plastic or rubber carb floats and O-rings before using carb cleaner. When it comes to removing the air and pilot screws, turn them individually until they stop and count the number of turns. When you reassemble the carburetors, set the same number of counts for proper installation of the screws.
Remove the carb jets being careful not to dislodge them or break any legs or struts with the carb body. Use carb cleaner to gently loosen any varnish fusing components. Check to see if the jets on your carburetors can be removed or not, just to be sure. Your service manual should guide you on how to rebuild carbs on a motorcycle.
After removing all the necessary components, you can dip the carbs in a recommended carb cleaner to remove the varnish. After a short soak, remove the carburetors and wipe off any excess carb cleaner, then spray each pass with the recommended spray carb cleaner. For shorter paths, use thinner wire. Again, safety is paramount when handling carbohydrate chemicals.
If your carburetors have been cleaned, it’s time to rebuild them. During the disassembly and cleaning process, you should have already noted any worn or damaged components so that you can get the right replacements. To make this process easier, it is advisable to purchase aftermarket carburetor rebuild kits.
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In any case, if you can completely clean the jets and reuse them in your carburetors, do so, as there may be slight differences between aftermarket jets and OEM parts, which can cause tuning problems. Washers, gaskets and O-rings from aftermarket carburetor rebuild kits can be used. Rebuilding a stock configuration is considered the best way to understand how to rebuild carbs on a motorcycle.
Rebuilding your motorcycle carburetors is not the end of the road. The performance of your bike depends on the combination of compatible parts and accessories to make the riding experience exciting. Shop West End Motorsports today for the parts you need to improve your bike, like throttle assist and basic maintenance tools like cleaners and polishes. Compare rates to find the best deal on the motorcycle insurance coverage you need.
This is especially true if you have a project motorcycle that has been sitting for a long time.
If your motorcycle is running poorly, chances are you’re going back to the carbs.
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Cleaning your motorcycle carburetors is a simple process, but takes time and organization. There are many small parts that go into each carburetor, and depending on the type of motorcycle and engine you have, you’ll have anywhere from 1 to 4 carbs to worry about.
If you’ve bought a motorcycle that’s been sitting for a long time, chances are pretty good that the carburetors need a thorough cleaning.
Get your motorcycle shop manual to read about the exact sequence for removing and disassembling the carbs from your motorcycle.
Make sure to go slow and keep things organized. Wait until you have a dedicated workspace before you disconnect the carbs from their rack and get into each one.
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Depending on the type of motorcycle you have, taking the carb off and on for cleaning can be a very difficult and time-consuming task.
This is a common question we get: Can I clean my motorcycle’s carb without removing it from the bike?
If your carbs need a light cleaning, you can leave them on the bike.
However, if your carburetors are really dirty, clogged, or badly varnished, the only way to properly clean them is to take them down and completely disassemble them.
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If you want to try cleaning your carbs while they’re still on the bike, you should try:
With your rack carbs from the bike, you can disconnect them by unscrewing them from the mounting plate.
There are usually 2 to 4 screws that hold each carb in place. Before you can access each carb, you may also need to remove the throttle rod and throttle shaft.
Set up your workstation with separate containers for each of your motorcycle’s carburetors. You want to keep all the internal components with the carb body they came with.
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This is especially important if your throttle discs work with a rubber diaphragm. Rubber diaphragms are easily damaged by carb cleaner and are often expensive to replace. If the bike has been sitting for a long time, be gentle when removing the throttle slide, as the rubber diaphragm may stick.
If a metal throttle is stuck in the carb body, you can try soaking it with penetrating oil or applying heat with a heat gun.
Rotate the throttle discs and float bowls. You can access and remove most of the jets from the bottom of the carb.
Before removing the propeller or pilot screw, turn it until it stops and count the turns. When you reassemble the carbs, count the same number of turns as installing each air screw.
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Remove the jets being careful not to break or break any bones/struts inside the body of the carb. Be gentle and use a carb cleaner to loosen the varnish dissolving things in place. Some jets are compressed. Some jets are not designed to be removed.
Depending on the age of your bike and the condition of the carbs, you may encounter some common problems, check out some tips below.
The drive pin holds the carb floats in place. On older carbs that have been sitting for a long time, these pins can freeze in place and become difficult to remove.
If you attach a drive pin, be sure to work slowly and carefully. If you rush you run the risk of breaking the pole and rendering the carb useless.
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Many carbs have a Welch plug, which is a factory installed cover that goes over the fuel adjustment screw.
As part of your carb clean and rebuild, you’ll want to remove the welch plug so you can get to the fuel/air screw.
The carb’s drive needle is the most common point of failure. If you have an old carb, your best bet is to replace it. However, replacement drive needles can also fail.
A bad drive needle cannot, and can, prevent fuel from flowing into the drive bowl
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