Hi all, found this on a web site the other day.
might of some help to YZ owners
Henry
1974 YZA Models
YZ80A Serial#462 Production# 000101- 009661
YZ125A Serial#453 Production# 000101- 007730
YZ250A Serial#431 Production# 000101- 004104
YZ360A Serial#432 Production# 000101- 000631
NOTE: The 1974 Models Were Silver W/Red Stripes And The Tank Was Held Down By Straps On The 125/250/360's.
1975 YZB Models
YZ80B Serial# 492 Production# 000101- 018570
YZ125B Serial# 453 Production# 100101- 101620
YZ250B Serial# 483 Production# 000101- 002759
YZ360B Serial# 484 Production# 000101- 001459
NOTE: The 1975 Models Were Yellow W/Black+White "C" Checkerboard Stripes. The Tanks Were Held Down By Straps As Well. This Is The Last Year Of The "Strap Tank" And The First Year Of The Monoshock For The 125/250/360's.
1976 YZC Models
YZ80C Serial# 598 Production# 000101-012750
YZ100C* Serial# 1J4 Production# 1J4-000101-003470
YZ125C* Serial# 537 Production# 537-000101-014044
YZ125X** Serial# 1G8 Production# 1G8-000101-007120
YZ175C* Serial# 1L8 Production# 1L8-000101-001610
YZ250C Serial# 509 Production# 509-100101-103405
YZ400C* Serial# 510 Production# 510-100101-101838
* First Year Of Production
** Produced In That Model Year Only
NOTE: The 1976 Models Were Yellow And All Were Monoshock Except The YZ80B. This Is The Last Year Of The Aluminum Tank And The First Year Of The Completely New Chassis/Engine Combination.
1977 YZD Models
YZ80D Serial#1T0 Production#000101- 020290
YZ100D Serial#1J4 Production#100101- 103550
YZ125D Serial#1W1 Production#000101- 015610
YZ250D Serial#1W3 Production#000101- 006520
YZ400D Serial#1W4 Production#000101- 006720
NOTE: This Is The First Year Of The Plastic Tank, Used On All Bikes Except The YZ80, YZ100. It Was Also A Completely Different Frame/Monoshock/Engine Design For The 125/250/400 Models. Bob (Hurricane) Hannah Raced An Almost Completely Stock YZ250D In His Sucessful 1977 Season.
1978 YZE Models
YZ100E Serial#2K5 Production#000101- 006572
YZ125E Serial#2K6 Production#000101- 015080
YZ250E Serial#2K7 Production#000101- 009850
YZ400E Serial#2K8 Production#000101- 007406
1979 YZF Models
YZ100F Serial#2W5 Production#000101- not available
YZ125F Serial#2X3 Production#000101- not available
YZ250F Serial#2X4 Production#000101- not available
YZ400F* Serial#2X5 Production#000101- not available
*Last Year Of Production
1980 YZG Models
YZ100G Serial#3R2 Production#000101-on
YZ125G Serial#3R3 Production#000101-on
YZ250G Serial#3R4 Production#000101-on
YZ465G* Serial#000101-on
*First Year Of Production
1981 YZH Models
YZ100H Serial#3R2 Production#
YZ125H Serial#4V2 Production#
YZ250H Serial#4V3 Production#
YZ465H** Serial#4V4 Production#
