Raider Pro 250 (single-seat / double-seat): Service Manual EEC Version: 1.0 Oct.. 2004
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3.6 Crankcase & Crankshaft
3.6.1 Disassembly Diagram
3.6.2 Trouble Shooting
Engine Noise
a. The bearing is loose;
b. The crankshaft pin bearing is loose.
c. The piston pin and the piston pin hole are loose.