∮30×54 (Type 125)
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In small- and medium-displacement motorcycle engines, a split-type crankshaft–connecting‑rod assembly is typically formed by press‑fitting the left and right crankpins to the crankshaft journal; the connecting‑rod big end employs a needle roller bearing with a cage. Using a modular crank design eliminates the need for large forging equipment during blank production and facilitates various heat‑treatment and machining operations, thereby effectively shortening the production cycle.
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