As a result of measuring the inner diameter of the cylinder, it was 0.02 mm ~ 0.03 mm widened, so boring is necessary.
But, oversize piston is abolished both one over and two over.
Put the oversized and a little can Bore up.
I can expect a little power up, but the dream collapsed fleetingly.

Although I examine the diversion of other car models, Bandit is impossible because the bore is the biggest.

So I have no choice but to make sleeves.
I decided to remove the sleeve.Even boring is troublesome.

I will pull it out with a manual hydraulic press.
When was removed, the block side was scratched.
This is all right if I scrape it off in Leutor.

This is a removed sleeve.

The escape of the intake valve is dug in the upper part.

First of all, I took off only 1 cylinder, and I measured dimensions and drew a drawing.
In this way ↓.

Those who are suffering from bad condition on board Bandit 250, are free to use this drawing without permission.
The outer diameter is mating tolerance becomes m7, but if it is m7 it will be φ55.011 to φ55.041.
The actual measurement here was φ55.100, but in this case the fitting tolerance is u6 or u7.It is a bit too tight.So I changed it without permission.

And,
· No escape of valves.
· The inner diameter is 1 mm smaller.
(Press fit into the cylinder block and boring to finish it to φ49.00.)
· Since the brim comes out of the block, it needs a surface research.
Please pay attention to this.
(Even if there is a problem, I will not take responsibility.)

As usual, I ordered the Dense Bar.I bought 60φ.
So brim will remain cast.

I am able to use it which was rolling at the edge of the factory.

Next time, I will cut out 4 sleeves with my hands.