This YS Engine YSS1045 crankcase plug is an aftermarket replacement for use with YS 50ST engine crankcases in model applications. It is intended to act as a spare part to aid maintenance and the replacement of worn crankcase components.
Fit the plug while performing scheduled inspections or when worn parts need replacement. The installation is part of ordinary engine disassembly and the plug locates into the specified crankcase aperture without any engine modification.
Reserve the part for model engine use only, check that it matches your engine model before fitting, and follow recommended teardown and reassembly steps to ensure correct alignment and sealing.
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