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This robin engine was originally from Boing 420 duster mist blower. I have replace with new cylinder and piston kit for this engine.
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Piston ring size: 40x1.5 mm.
Crank case seal size: 15*25*7
Crank case bearing size: 15*35*11 (6202) 2 pcs.
Engine specification: www.subarupower-global.com/eng...