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Message: [QUOTE="dirt bike dave, post: 1036248, member: 18302"] It's gotta be crushed bearings. Pull the piston off and check the wrist pin bearing. If it is intact (it probably will be) the debris came from somewhere else. Probably a crankshaft bearing or a big end bearing. If so you are looking at splitting the cases. The good news is that OEM Honda crank assemblies are relatively cheap ($170 or so at Service Honda; includes an assembled crank, rod and big end bearing). A piston and top end kit will run about $120; complete gasket set about $70, crank bearings about $30-$35 each, misc. stuff another $20 or $30. Any head or replating work is gonna add some more $. If you are not comfortable splitting the cases and doing the reassembly, you can probably find a shop to do it for about 3 to 4 hours of work if you remove the motor and reinstall it yourself. [/QUOTE]