Because the piston fits into the cylinder, I will assemble the head.

I kept shim and valve lifter in the paper cup and I will return it to the original place.
If I do not return it to the same place the valve clearance will change.
I have to make sure not to make a mistake.
I am writing a place into a the paper cup.

By the way, the valve clearance examined on the net is ↓.
IN・・・0.17mm～0.27mm
EX・・・0.20mm～0.30mm
It is quite wide.Moreover, the allowable range is wide.

Because Cub is around 0.05 mm, it is about 3 to 4 times.
Because the port is long in the longitudinal direction, the valve will also become longer and linearly expand.
The other day I did the valve rubbing, but I can only sharpen at 1/100 units at most.
So has no influence.

I do air blow one by one and assemble it.
I am careful that I fly it and do not lose it.

A strategy to put a piston in a cylinder first, and to let a piston pin go through later.
I failed, so I made a notch in the skirt of the cylinder.

I sharpened it with a sander, but can sharpen it fast.
It is a feeling that it collapses rather than sharpen.
The casting will be such feel.

The piston pin is now passed.

But, centering the core, matching the piston and the hole of the connecting rod,it is difficult to pass the piston pin.
The oil ring will soon get out of the sleeve.

And a thing to put Retaining_ring of two cylinders of the middle in is difficult.
I failed several times.I bent three of the eight oil rings.
There was no choice but to reuse it.
If the sealant dries, I wipe it off once again and am repetition that I paint already once.

And …

At last it entered!

I’m about to cry.
This song is flowing in my head.

https://youtu.be/t1yzIeBRh5o