Z50 MODEL IDIF YOUR FRAME NUMBER IS BETWEEN_____AND_____YOU HAVE A

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Z50AK0 = Z50A-100001 TO Z50A-120087

(note just 6 digets) no rear shocks

 

Z50AK1 = Z50A-120088 TO Z50A-270235

(note just 6 digets) no rear shocks

 

Z50AK2 = Z50A-270236 TO Z50A-399999

(note just 6 digets) no rear shocks

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Z50AK3 = Z50A-1000001 TO Z50A-3000000

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Z50AK4 = Z50A-3000001 TO Z50A-5000000

 

Z50AK5 = Z5OA-5000001 TO Z50A-6000000

 

Z50AK6 = Z50A-6000001 TO Z50A-6100000

 

Z50A 1976 = Z50A-6100001 TO Z50A-6200002

 

Z50A 1977 = Z50A-6200003 TO Z50A-6300002

 

Z50A 1978 = Z50A-6300003 TO Z50A-6499999

 

FROM 1978 ON THE US GOVERMENT MADE MANUFACTURERS PUT THE YEAR MODEL DESIGNATION ON EACH BIKE. AND HONDA DID VERY WELL, LOOK ON THE STEERING HEAD OR UNDER THE TANK.