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A few changes from 2010.
A welded repair is allowed, to the engine mounting area at the crankcase base only.
Valves will be standard unmodified. Valve-seat grinding and cutting is allowed, to the single standard profile only (45°) and 30° cut to restore seat width, as specified in the latest Honda manual for the engine type.
From GX160parts
Carburettor There is no restriction to the use of standard, unmodified A, B or C type carburettors with any of the engine types. However all carburettors are subject to normal dimensional criteria. Overall length (manifold face to airbox face) is 54mm and bore go / no go gauge is 13.2mm / 13.3mm. Pilot jet size 35 only, the mixture screw tang can be removed.
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