1023E, 1025R and 1026R – Rebore Cylinder

[1] –
The cylinder block can be rebored to use oversize pistons and rings. Pistons and rings are available in 0.25 mm (0.010 in.) oversize.
Align center of bore to drill press center.

[2] – Adjust hone so lower end is even with lower end of cylinder bore.

[3] – Adjust rigid hone stones until they contact narrowest point of cylinder.

[4] – Coat cylinder with honing oil. Hone should turn by hand. Adjust if too tight.

[5] – Run drill press at about 250 rpm Move hone up and down in order to obtain a 30—40° crosshatch pattern.

[6] –
Measure bore when cylinder is cool. Finish should not be smooth and have a 30—40° crosshatch pattern.

Remove rigid hone when cylinder is within 0.03 mm (0.001 in.) of desired size.

[7] – Use a flex hone with 180 grit stones for honing to final size.

[8] – Check bore for size, taper, and out-of-round. (See Inspect Cylinder Bore in this Group.)

[9] –
Do not use gasoline, kerosene, or commercial solvents to clean cylinder bores. Solvents do not remove all abrasives from cylinder walls.

Clean cylinder thoroughly using warm soapy water until clean white rags show no discoloration.

[10] – Dry cylinder and apply engine oil.