Compare with

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I’ve got Mantra.
Yesterday I went to Tokyo and bought Mantra at Spiral.

I compare with OS.

Mantra heavier than OS.

It’s OS.

Nova connection rod is the most strong.
And big metal is connected precious.
There is no groove between metal.

Piston have four holes.
Then piston is lighter.

Two hole is placed near intake side.
It protects to expand by heating.
Piston attaches sleeve at top position like OS.



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