Industrial heat guns can heat parts with hot air of 200°C or higher, but there are cases where heated parts become heat spots that can damage parts if kept warm for a long time. In such cases, we should not forget the unexpectedly great help = boiling water. Here, let's focus on maintenance measures that can be practiced with the materials and tools that are most readily available.
Warming and cleaning of pots and kettles with great effect.
I used a cassette stove with a cartridge cylinder to heat water in a kettle. The pot and kettle are tools that can be used for maintenance, so it is good to secure those that are no longer needed. I mixed a small amount of Hanasaka G Multi Cleaner to enhance the degreasing and cleaning effect of the parts. The addition of this cleaning solution is definitely effective in cleaning the fine passages inside the carburetor. Ventilate the work area and make sure that there are no flammable materials in the vicinity. I soaked the entire carburetor in a kettle of boiling water mixed with a multi-cleaner, covered it, turned off the heat, and waited for 30 minutes to pass.
After that, I pulled up the plunger and lightly turned it with a screwdriver over the groove on the top of the plunger, and the plunger was able to pull out in the next instant. It seemed that sticking sludge had accumulated and could not be pulled out. There are many cases where the wire hooking part of the plunger is broken by twisting it with a screwdriver at room temperature by force.
Use tea strainers for small parts
The inner parts in the float chamber were placed in a tea strainer net and wire locked. I submerged it in a kettle of boiling water with a multi-cleaner along with the carburetor. The float's puncture condition can also be checked at the same time by submerging the float completely. If there is a hole in the float, hot water can seep into the float and a chirping sound can be heard when the float is taken out and a puncture can be detected. In fact, this time, a puncture in the float was discovered after this work! We had no choice but to practice puncture repair.
Staff recommended highly effective chemical
By turning a 2-liter plastic bottle on its side and cutting off the top surface with a cutter knife, you can make your own easy-to-use wash tray if it is for small-displacement or single-cylinder models. The carburetor body, from which the plunger could be removed, and the small parts in a tea strainer were soaked in undiluted Yamalube Super Carburetor Cleaner, a highly trusted product, for complete cleaning. The most important feature of this undiluted type of carburetor cleaner is that it is diluted purely with fuel.
It is important to follow the work progress according to the instructions
Dilute at a ratio of 3 undiluted carburetor cleaners to 7 fresh fuel. Soak the carburetor parts thoroughly for complete cleaning. In many cases, carburetors can be restored to performance simply by disassembling and cleaning. For motorcycles that have not been ridden .for a while, it is desirable to disassemble and clean the carburetor completely from the beginning. Parts that were sticky and soggy when disassembled are clean and fresh after cleaning, making assembly and restoration fun. Timely work progress is possible if gaskets are prepared prior to the overhaul
POINT
Point 2 - Utilize containers = baskets to prevent parts from being lost during work
Point 3 - Read and understand the instructions carefully before using chemicals.
In some cases, sticking choke plungers cannot be pulled out even with kerosene cleaning. In this case, multiple carburetors were disassembled and cleaned at the same time, but some plungers were pulled out by kerosene cleaning and others were not. Here we report on a cleaning method using hot water. Knowing that an open flame burner has a heat source of over 1000°C and an industrial heat gun has a heat source of nearly 400°C, these tools should be handled with care, even if they are easy to use, and in some cases, they may not be used in certain locations. On the other hand, hot water is around 100°C1, so it should be easier to control the temperature compared to the aforementioned tools.
However, some materials may react to hot water depending on the parts to be cleaned, so it is recommended to remove vinyl resin and other parts before cleaning to ensure a satisfactory cleaning process.
Here, I soaked the carburetor in boiling water + multi-cleaner solution, turned off the fire, and waited about 30 minutes. I took the carburetor away from the boiling water while watching the time, and while holding the carburetor with leather gloves to avoid burns, I gently turned the groove on the top of the flange that I could not pull out with a flat-blade screwdriver. The handles did not move at all when they were at room temperature, but after immersing them in hot water, they spun around with a scratchy, sticky feeling, and immediately after that, they were able to be pulled out with a snap.
Staring at the outer circumference of the plunger and the surrounding area, I found a large accumulation of white sludge that looked like chalk. This plunger has a rubber stopper caulked at the bottom, and normally the rubber stopper acts as a valve to close the starter choke passage by spring force. If the rubber plug is crushed due to aging, fuel will constantly leak from the choke passage, which can cause the thick gas condition = carburetor setting to go haywire, get lost, or make a mistake. If the car starts well when the cold starts, but after warming up is complete, the gas is too thick = plugs are sticking out, it is a good idea to check the condition of the starter choke plunger. Of course, even if the rubber stopper is not damaged, there are cases in which the plunger itself does not function as a valve due to malfunctioning, and if this happens, the same malfunctioning symptoms described above will occur.
