Borbin the 🐱

The amount of oil in final drive of the CJ750 / M72 motorcycle needs to be very precise, otherwise the oil is pushed out through the main seal. The reason for this is the small volume of the final drive gear. Even the slightest overfilling push out oil when the final drive gets warm during driving.
To solve the problem, I had installed a small cylindric chamber (1) to collect the oil. But there was still some oil splashed out of the breathing hole so I added another chamber on top of it (2).

With the recommended 0.15l oil, there was still some splashing. Especially driving uphill.
To get around this problem once and for all, I have made an even larger chamber (3) holding a fair amount of oil that allows a slight overfilling to ensure I have always enough oil.
The thread size is M14x1.5.