Fits DLE 170 / DLE 170M / DLE 85. Replacement piston ring for the DLE 170 twin 170cc engine.
Function: it is the piston ring, which seals compression on the piston.
Shared across the DLE 170 / DLE 170M / DLE 85 range, so this is the common part number for all of those engines.
The reason this ends up on an order: a ring is a wear item replaced at overhaul; a worn or stuck ring shows as falling compression, difficult starting and rising fuel consumption.
Fitting note: Check the ring end gap in the bore and make sure the ring is free in its groove.
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