Motorcycle Crankshaft Assy include Connecting Rod Bearing for CF MOTO 250NK 250SR CF250 CF 250 NK SR matched Fit For CFMOTO CF250 250NK 250SR single cylinder engine crankshaft transmission system, complete assembly equipped with connecting rod matched bearing bushes Direct bolt-on replacement; no or extra needed during full engine overhaul, align with crankcase cylinder clutch mounting interface forged crank blank with balanced machining; reduce engine vibration at RPM for stable daily commute highway sport riding Wear connecting rod load bearing shells; sustain long-term speed operation to avoid shaft jitter abrasion engine knocking faults Strict OEM dimensional tolerance control; restore engine compression power output to fix power loss abnormal noise unstable idle issues