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This is the center of the crank.

I thought what is in the space here, and when I opened it was a hollow.

I think that it is good if a large boss is attached to the clutch cover side of here and a bearing is provided and the gear of this crank is turned.
Maybe.

By the way, this primary gear is for dry clutch.

Without decompression, the power of the cell motor is extremely necessary.
So, it probably needs auto decompression.
I think this is also mandatory.
Usually it is attached to the center of the camshaft, but if you want to install it as it is, I think that you can attach something here.
But, I want to adopt a reliable mechanism because the engine stops when it causes the malfunction while running.

Araki F Machine seriously introduced technology and made it.
It’s all made with cutting of the aluminum.
It’s extremely mechanical ballpoint pen, MechaSEA.
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