Yamaha Motorcycle Engine Serial Number Decoder
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Toby,Based on the engine block number you have provided, S650-216989 represents a 1973 TX650. Now, if the neck numbers are identical to the block numbers, then you have a 1973 TX650 engine and frame. If they differ, then they are not a match. Let us know if we can be of further assisance. 2b1af7f3a8