Years of low annual mileage (for the past six years it had been doing around 200 miles at most every year between MOTs) meant the carbs and jets were gummed up with sticky fuel residue and nothing short of an ultrasonic cleaning bath was going to get the job done.
Honda Cbr 600 Carb Cleaningl
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Just fired up my motorcycle after 3 years in storage. Changed the oil and replaced the fuel in the tank. It starts easily. It is leaking fuel from somewhere under the gas tank. The engine has a caburetor (not fuel injected). Some reading tells me common problems are dry o-rings or gummed up carbs causing them to overflow.
A stuck carburetor float-bowl valve (commonly referred to as a 'stuck float') is a frequent cause of overflow problems. Each carburetor has a fuel reservoir on the bottom containing a floating shut-off valve inside that stops fuel from flowing to the carb when the fuel level rises high enough in the bowl.
When there is a stuck float, fuel keeps flowing even when the bowl is full. This causes gas to back up into the carburetor and eventually out a fuel overflow tube. This tube is sometimes on the top of the carbs, sometimes on the bottom. All carbs typically share the same overflow tube. Note: This overflow tube is different than a drain tube.
If you are lucky, a stuck float can sometimes be jostled free by rapping sharply on the float bowls with the wooden handle of a screwdriver. If you are not lucky, you will have to remove and clean the carburetors.
I would get the tank up and take a very good look around for the leak. Does it only leak when running? That may give you a clue as to whether it's tank or carb related. The chances are that it'll have a vacuum activated petcock as Jack M. mentions above. They can stick open and allow fuel to flow all the time into the carbs, whcih then overflow into the crankcase.You can open up the oil check port and sniff to see if that smells heavily of petrol, that would indicate that the carbs are leaking the fuel.
An important part of motorcycle maintenance involves carburetor cleaning. This should be done the moment you feel that your engine is not running smoothly, after a certain number of kilometers, or at the beginning of riding season. Regular cleaning of carburetor ensures longevity of your motorcycle. Experts recommend that many problems associated with the engine performance can be solved by cleaning the carburetor regularly.
Whether two-stroke or four-stroke engines, single-cylinder or multi-cylinder engines, air or water-cooled units, the carburetor ensures that fuel is mixed with the air in the most ideal ratio (stoichiometric ratio). The air-fuel mixture is fed into the combustion chamber via nozzles where the explosion takes place. In order to utilize air fuel mixture completely and to generate full power, the carburetor needs to maintain an ideal A/F ratio and thus prevent the mixture from getting too lean or too rich.
However due to external factors, the vents or other vital parts of the carburetor may get clogged with impurities. This clogging usually occurs during long winter breaks as the deposits and fuel residues settle around the carburetor. If in any case, the carburetor is not cleaned of dirt, the following problems can arise:
The main reason of carburetor clogging is impurities present in the fuel. This results in formation of carbon deposits around the jets of carburetor, which then obstructs the normal flow of fuel inside the engine. Moreover, engine oils that are not periodically changed over time may also lead to clogging. This is a common phenomenon and mostly observed with motorcycles that are stored during winters.
We can have these problems checked by an expert mechanic at a service center, or alternatively, we can try to clean the carburetor ourselves without removing it from the main engine, which is much more economical option since carburetor needs to be checked on regular basis.
Before you proceed with carb cleaning, it is important to wash the motorcycle thoroughly. This removes mud, sand and asphalt residues that are stuck near the engine. Depending on the motorcycle body, it is best to remove the saddle and fairings so as to ensure an effective cleaning.
To clean a carburetor without disassembling it, we can simply use a compressed air gun which is sometimes enough if the clogging is not severe. With the help of compressed air and fuel, most of the grease and fuel residues can be removed from the jets. Once done, carefully clean the upper tray and the float as well.
Below the carburetor you will find a thin membrane (diaphragm) with a spring, make sure you clean this area as well with the help of compressed air and fuel (petrol). Post which, you can reassemble everything and take your bike for a test ride.
Cleaning your motorcycle carburetor with Sea Foam is quite simple. It does not require you to dismantle the carburetor from your motorcycle and can be done at home. Primarily, there are two ways to clean your carb; by mixing Sea Foam with your fuel, and, by mixing Sea Foam with your engine oil.
Deposits that clog the fuel system are primarily formed due to bad quality of fuel. And even if you prefer high octane fuel, there is a high probability that it may still have some impurities, depending on the gas station. These impurities that later clog the valves and jets of the carburetor cannot be cleaned with kerosene, or any other universal cleaner. Take a note that any type of cleaner that contains oil or silicone pose an additional risk of clogging and thus are not at all ideal for carburetors.
If the carburetor does not run smoothly, if it repeatedly misfires, or frequently stalls at low speeds, there is a possibility that the air-fuel ratio is disproportionate. Possibilities of dirty air or oil filter cannot be ruled out as well.
In order to clean the parts of carburetor thoroughly, experts recommend an ultrasonic bath. After ultrasonic cleaning, the carburetor regains its original performance. However, in order to clean the carburetor completely, you may have to completely dismantle it from the engine.
A professional service centre can charge you between $80 and $200 for cleaning, this depends if the carburetor is already dismantled from the motorcycle engine or not. The method usually comprises of ultrasonic bath, which removes clogging, degreases the jets, and deoxidizes mechanical parts. If you have the necessary tools to disassemble your carburetor, the cost will be much more economical.
A carburetor comprises of throttle valve, strainer, venture, float chamber, mixing chamber, metering system, idling system, and transfer port. In order to clean the carburetor efficiently you can either remove it from the engine before dissembling its parts, or you can just leave everything in place and blow compressed air into the holes. If you have some experience in cleaning your motorcycle carburetor, it is best to completely remove it and clean with WD-40 Specialist Engine Degreaser.
Another important characteristic of a good motorcycle carburetor cleaner is its ability to dissolve various deposits that accumulate around the carburetor, such as gums, grime, and other harmful sediments. Products like Berryman B-12 chemically react with the deposits and remove them in the form of exhaust gasses.
Furthermore, the cleaner should be 100% dissolvable. It must not remain inside the carburetor for a long time. Just like carbon deposits, cleaning agents can clog the carburetor. So make sure you only opt for products that are recommended by experts.
Sometimes a dirty oil or air filter can be the reason for frequent misfires and sometimes it is not the carburetor or the filters attached to it, but faulty spark plugs that cause problems during cold starts.
If the motorcycle is used regularly, the carburetor hardly gets dirty because it is automatically kept clean by the regular flow of fuel. This being said, it is best to inspect and clean your carburetor every six months if you are using your motorcycle on a daily basis. However, if you are starting your engine after a long gap (post winter season) it is best to completely dismantle the carburetor from your motorcycle and thoroughly clean the parts before using it. 2ff7e9595c
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