OS unveil

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OS engine unveil new 21 XZ-B spec 3.
It's different from B2101 at bore stroke.
Bore is 16.27mm.
Stroke is 16.8mm.

OS and Nova piston rub sleeve at piston top.
Then big bore piston is more expanded by thermal.

It make difficult for break in.
And a lot stress damage to connection rod more than small piston.

I saw several times OS connection rod breaking on B2101.

The spec 3 is long stroke.
It's easy for break in and easy drive for middle class driver.

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