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This is my "shopping list" for the overhaul of the TZ250J engine:

93210-62323 o-ring 2
93210-14421 o-ring 2
90215-21239 washer, lock 1
93604-08071 pin 5
4A0-11634-00 clip 4
90201-08087 gasket 4
137-11633-10 pin, piston 2
93310-216L2 bearing 2
240-11611-00 pistonring 2
4A0-11631-97 piston 2
4A0-11351-10 gasket, base 2
5F7-11310-00 cylinder 2
RENTHAL 252a-520-16P 1
RENTHAL 159-520-40P-HA 1
DID 520-ERV-2 rivetlink 2

Cylinders and pistons are not available. All the other parts can be ordered from Yamaha and others (Renthal sprockets)