The side stand and main stand are essential when parking a motorcycle. Even a beautifully finished old motorcycle can become a hazard when parking if the stand is in poor condition. An over-tilted side stand is one such example. As for the main stand, the front and rear tires may touch the road surface when the stand is used. Here, I will report on the "stand repair" of a Super Cub that causes the front and rear tires to touch the road surface.
Exhaust system fixed to plate on the pivot shaft
I didn't realize that this part had been crashed and was stuck. It must have continued to operate while completely out of grease and oil, and a part of the shaft and the pivot bearing on the frame side must have been gouged. In anticipation of this kind of situation, it is advisable to grease and seal the various moving parts of the motorcycle body well. I was able to obtain used parts from an online auction, so without hesitation, I cut off the crashed parts and tried to disassemble it.
Challenging "shaft extraction" using thermal expansion
I removed the exhaust system, pulled out the split pin on the pivot shaft, and tapped it with a hammer, but it didn't go away. Unfortunately, the paint burned off, but I heated the main stand pipe with a burner to warm it up and tapped it some more. But the situation was still the same, and there was no sign that it was going to come loose. Since I had no choice, I decided to pull it out by tapping it from the opposite side, and rubbed the weld on the exhaust system bracket with a taper drill to separate it. Then, I hit it hard with the unwanted axle shaft, but it didn't move as if it was. When I thought it finally started to move, I found that the frame side receiving part was actually bent.
Tapping with a shaft of the same diameter didn't work.
By striking it with a shaft of the same diameter, the frame side was bent, although it was an illusion that it was coming loose. I had no choice but to attach the folded metal saw to an air saw that allows the blade to push in and cut even in tight areas, and I plunged it into the gap between the main stand and the frame, and cut the pivot shaft in a circle.
Surfacing out the stopper to "not overdo it".
The remaining shaft inside the main stand could be extracted by making full use of a hydraulic press. The stopper portion of the main stand was worn and concave in shape, so it was modified with a semi-automatic welding machine. This prevented the rear tire from grounding on stunt ups.
- Point 1: When striking the shaft to remove the shaft, be sure to use a hammer or a stick instead of striking it directly with a hammer.
- Point 2: A welding machine is convenient to have when maintaining old motorcycles. AC100V outlet version for household power supply is also available.
- Point 3: When using a welding machine, it is better to explore welding conditions (current and voltage) with a test piece of the same plate thickness, rather than suddenly going into production.
Vehicles that have been driven for many years can suffer damage (bending, wear, etc.) to the stopper and pivot areas of the main and side stands. For example, not only the front but also the rear tire touches the ground (in some models, the front wheel floats in some cases). Some main stands are damaged. Visual inspection of the main stand stopper part of this Super Cub reveals that it has a V-shaped pressed part welded to it, and that the pressed part presses against the stopper to stop it. However, over the years of use, the pressed parts had become bent and worn, causing the rear tire to touch the ground.
When this happens, let's correct the stopper area with weld walling and restore the rear tire to float. When the front and rear tires are grounded, they are often unstable in various situations. Then it is a repair practice, but here is a troubling problem! What a surprise, the main stand cannot be removed.
The pivot shaft of the main stand and the pipe on the side of the stand are greased to maintain slippage and enable operation. However, this Super Cub had run out of grease, and although the stand worked, the shaft and the frame side support seemed to have rusted together. When I tried to pull out the pivot shaft, the worn part was stuck with the bearing part, and I could not pull it out easily. I had no choice but to cut the shaft with an air saw, knowing that the pivot shaft would be unusable. Then I disassembled it, but maybe this Super Cub has been no-greased up for 50+ years.
Semi-automatic non-gas welding machines that can be used with a 100V AC outlet power supply for general household use are very useful for repairing and repairing steel parts. High-performance models have also appeared. They are literally non-gas powered, so they do not require inert carbon dioxide or argon gas. As long as you have a power source, you can seriously enjoy repairing iron parts and DIY projects Introducing AC100V Semi-Automatic Non-Gas Welding Machine. You may want to consider purchasing this dreamy equipment.
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