Długo szukałem w necie informacji o numerach seryjnych silnika i ich związku z rocznikiem AT - czyli info o roku produkcji SILNIKA. 
W końcu znalazłem takie tabelki. Wklejam w całości bo może się nadać dla potomności. 
zródło : 
http://at.straznica.cz/AT/rv.htm
Dla porządku wklejam też obrazek z rozpiską VIN, ale to jest bardziej znane.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
| Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501990 
 | AR | Austria | RD04E-2000054 ~2006183
 | RD04-2000042 ~2005553
 | VDG8A             A | 
  | B | Belgium | RD04E-2002246 ~2006594
 | RD04-2002212 ~2005834
 | 
  | E | England | RD04E-2000075 ~2005922
 | RD04-2000063 ~2005316
 | 
  | F | France | RD04E-2000027 ~2006704
 | RD04-2000017 ~2005944
 | 
  | G | Germany (Full power)
 | RD04E-2000038 ~2004677
 | RD04-2000026 ~2004309
 | 
  | H | Netherland | RD04E-2003621 ~2004111
 | RD04-2003291 ~2003780
 | 
  | IT | Italy | RD04E-2000063 ~2005712
 | RD04-2000061 ~2005106
 | 
  | ND | North Europe | RD04E-2000052 ~2005994
 | RD04-2000040 ~2005387
 | 
  | SP | Spain | RD04E-2001540 ~2006709
 | RD049 *OM000001
 ~OM000737
 | 
  | SW | Switzerland | RD04E-2000040 ~2006085
 | RD04-2000028 ~2005478
 | VDGZA               B | 
  | 2G | Germany (50 ps)
 | RD04E-3000001 ~3002245
 | RD04-3000001 ~3001203
 | VDG8A              A | 
 
   
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501991 
 | AR | Austria | RD04E-5000021 ~5000329
 | RD04-2100009 ~2105747
 | VDG8E             A | 
  | B | Belgium | RD04E-2100120 ~2106326
 | RD04-2100117 ~2106063
 | VDG8A             A 
 | 
  | E | England | RD04E-2100744 ~2106329
 | RD04-2100815 ~2106066
 | 
  | F | France | RD04E-2100002 ~2106278
 | RD04-2100002 ~2106024
 | 
  | G | Germany (Full power)
 | RD04E-2100001 ~2104244
 | RD04-2100001 ~2104115
 | 
  | H | Netherland | RD04E-2100011 ~2103539
 | RD04-2100014 ~2103311
 | 
  | IT | Italy | RD04E-2100004 ~2106289
 | RD04-2100004 ~2106035
 | 
  | ND | North Europe | RD04E-2104215 ~2104224
 | RD04-2103984 ~2103996
 | 
  | SP | Spain | RD04E-2100016 ~2106298
 | RD049 *OM100001
 ~OM100590
 | 
  | SW | Switzerland | RD04E-2100022 ~2105791
 | RD04-2100021 ~2105551
 | VDGZA               B | 
  | 2G | Germany (50 ps)
 | RD04E-3100001 ~3101536
 | RD04-3100001 ~3101534
 | VDG8A              A | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501992 
 | AR | Austria | RD04E-5100001~ | RD04-2200001~ | VDG8E             A | 
  | B | Belgium | RD04E-2200001~ | RD04-2200001~ | VDG8A             A | 
  | E | England | RD04E-2201071~ | RD04-2201221~ | 
  | F | France | RD04E-2200006~ | RD04-2200006~ | 
  | G | Germany (Full power)
 | RD04E-2200003~ | RD04-2200003~ | 
  | H | Netherland | RD04E-2200001~ | RD04-2200001~ | 
  | IT | Italy | RD04E-2200001~ | RD04-2200001~ | 
  | ND | North Europe | RD04E-2201829~ | RD04-2201869~ | 
  | SP | Spain | RD04E-2201075~ | JH2RD049 *OM200001~
 | 
  | SW | Switzerland | RD04E-2200001~ | RD04-2200001~ | VDGZA               B | 
  | 2G | Germany (50 ps)
 | RD04E-3200001~ | RD04-3200001~ | VDG8A              A | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501993 
 | AR | Austria | RD04E-5200001 ~5200531
 | RD07-2000022 ~2005363
 | VP50C             A | 
  | B | Belgium | RD04E-2300025 ~2305652
 | RD07-2000019 ~2005303
 | VP50A             A | 
  | E | England | RD04E-2300457 ~2305657
 | RD07-2000458 ~2005308
 | 
  | F | France | RD04E-2300023 ~2305663
 | RD07-2000017 ~2005314
 | 
  | G | Germany (Full power)
 | RD04E-2300051 ~2305557
 | RD07-2000052 ~2005527
 | 
  | H | Netherland | RD04E-2300027 ~2303229
 | RD07-2000021 ~2003181
 | 
  | IT | Italy | RD04E-2300031 ~2305621
 | RD07-2000032 ~2005272
 | 
  | ND | North Europe | RD04E-2300461 ~2303429
 | RD07-2000462 ~2003381
 | 
  | SP | Spain | RD04E-2300028 ~2305672
 | JH2RD079 *OM000001
 ~OM000834
 | 
  | SW | Switzerland | RD04E-2300029 ~2305144
 | RD07-2000025 ~2004952
 | VP50B             A | 
  | 2G | Germany (50 ps)
 | RD04E-3300001 ~3301723
 | RD07-3000001 ~3001723
 | VP50A             A | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501994 
 | AR | Austria | RD04E-5300001 ~5300552
 | RD07-2100096 ~2104154
 | VP50C             A | 
  | B | Belgium | RD04E-2400268 ~2404920
 | RD07-2100357 ~2104998
 | VP50A             A | 
  | E | England | RD04E-2400303 ~2404947
 | RD07-2100392 ~2105025
 | 
  | F | France | RD04E-2400007 ~2404867
 | RD07-2100007 ~2104945
 | 
  | G | Germany (Full power)
 | RD04E-2400156 ~2403755
 | RD07-2100245 ~2103885
 | 
  | H | Netherland | RD04E-2400248 ~2403273
 | RD07-2100337 ~2103422
 | 
  | IT | Italy | RD04E-2400203 ~2404946
 | RD07-2100292 ~2105024
 | 
  | ND | North Europe | RD04E-2401086 ~2401088
 | RD07-2101135 ~2101137
 | 
  | SP | Spain | RD04E-2400096 ~2404950
 | JH2RD079 *OM100001
 ~OM100477
 | 
  | SW | Switzerland | RD04E-2400106 ~2404970
 | RD07-2100195 ~2105045
 | VP50B             A | 
  | 2G | Germany (50 ps)
 | RD04E-3400001 ~3401750
 | RD07-3100001 ~3101775
 | VP50A             A | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501995 
 | AR | Austria | RD04E-5400001 ~5400302
 | RD07-2200096 ~2203314
 | VP50C             A | 
  | B | Belgium | RD04E-2500417 ~2503350
 | RD07-2200520 ~2203608
 | VP50A             A | 
  | E | England | RD04E-2500567 ~2503353
 | RD07-2200570 ~2203611
 | 
  | F | France | RD04E-2500008 ~2503355
 | RD07-2200008 ~2203613
 | 
  | G | Germany (Full power)
 | RD04E-2500557 ~2503147
 | RD07-2200560 ~2203419
 | 
  | H | Netherland | RD04E-2500580 ~2501566
 | RD07-2200582 ~2201792
 | 
  | IT | Italy | RD04E-2501013 ~2503045
 | RD07-22001071 ~2203317
 | 
  | ND | North Europe | RD04E-2500001 ~2502731
 | RD07-22000001 ~2202996
 | 
  | SP | Spain | RD04E-2500572 ~2503357
 | JH2RD079 *OM200001
 ~OM200043
 | 
  | SW | Switzerland | RD04E-2501580 ~2502721
 | RD07-2201806 ~2202986
 | VP50B             A | 
  | 2G | Germany (50 ps)
 | RD04E-3500001 ~3500910
 | RD07-3200001 ~3200910
 | VP50A             A | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501996 
 | AR | Austria | RD04E-5500006 ~5500426
 | JH2RD07C *TM000006
 ~TM000426
 | VP50C             A | 
  | E | England | RD04E-2600357 ~2604446
 | JH2RD07A *TM000346
 ~TM002593
 | VP51A             A | 
  | ED | European direct sales
 | RD04E-2600422 ~2604661
 | JH2RD07A *TM210005
 ~TM211903
 | 
  | F | France | RD04E-2600001 ~2604533
 | JH2RD07A *TM000001
 ~TM002623
 | 
  | G | Germany (Full power)
 | RD04E-2600030 ~2604616
 | JH2RD07A *TM000024
 ~TM002638
 | 
  | ND | North Europe | RD04E-2600389 ~2604070
 | JH2RD07A *TM000378
 ~TM00
 | 
  | SW | Switzerland | RD04E-2600040 ~2601633
 | JH2RD07D *TM000001
 ~TM000115
 | VP50B             A | 
  | 2G | Germany (50 ps)
 | RD04E-3600001 ~3600850
 | JH2RD07B *TM000001
 ~TM000850
 | VP51A             A | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501997 
 | AR | Austria | RD04E-5600006 ~5600340
 | JH2RD07C *TM100006
 ~TM100340
 | VP50C                          B | 
  | E | England | RD04E-2701141 ~2703625
 | JH2RD07A *TM100725
 ~TM101997
 | VP51A                          B | 
  | ED | European direct sales
 | RD04E-270075 ~2703806
 | JH2RD07A *TM220004
 ~TM221660
 | 
  | F | France | RD04E-2700380 ~2704106
 | JH2RD07A *TM100170
 ~TM102343
 | 
  | G | Germany (Full power)
 | RD04E-2700510 ~2703671
 | JH2RD07A *TM100300
 ~TM102043
 | 
  | H | Netherland | RD04E-2700001 ~2703282
 | JH2RD07A *TM100001
 ~TM199999
 | 
  | ND | North Europe | RD04E-2701805 ~2703228
 | JH2RD07A *TM100001
 ~TM101914
 | 
  | SW | Switzerland | RD04E-2701805 ~2702409
 | JH2RD07D *TM100006
 ~TM100100
 | VP50B                          B | 
  | 2G | Germany (50 ps)
 | RD04E-2700001 ~2700580
 | JH2RD07B *TM100001
 ~TM100580
 | VP51A                          B | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501998 
 | AR | Austria | RD04E-5700001~ | JH2RD07C *WM300001~
 | VP50C                          B | 
  | E | England | RD04E-2800001~ | JH2RD07A *WM300001~
 | VP51A                          B | 
  | ED | European direct sales
 | RD04E-2800003~ | JH2RD07A *WM300003~
 | 
  | F | France | RD04E-2800153~ | JH2RD07A *WM300153~
 | 
  | G | Germany (Full power)
 | RD04E-2800203~ | JH2RD07A *WM300203~
 | 
  | H | Netherland | RD04E-2800001~ | JH2RD07A *WM300001~
 | 
  | ND | North Europe | RD04E-2800001~ | JH2RD07A *WM300001~
 | 
  | SW | Switzerland | RD04E-2800001~ | JH2RD07D *WM300001~
 | VP50B                          B | 
  | 2G | Germany (50 ps)
 | RD04E-3800001~ | JH2RD07B *WM300001~
 | VP51A                          B | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV7501999 
 | AR | Austria | RD04E-5800001~ | JH2RD07C *XM300001~
 | VP50C                          B | 
  | E | England | RD04E-2900001~ | JH2RD07A *XM300001~
 | VP51A                          B | 
  | ED | European direct sales
 | RD04E-2900001~ | JH2RD07A *XM300001~
 | 
  | F | France | RD04E-2900001~ | JH2RD07A *XM300001~
 | 
  | G | Germany (Full power)
 | RD04E-2900001~ | JH2RD07A *XM300001~
 | 
  | H | Netherland | RD04E-2900001~ | JH2RD07A *XM300001~
 | 
  | ND | North Europe | RD04E-2900001~ | JH2RD07A *XM300001~
 | 
  | SW | Switzerland | RD04E-2900001~ | JH2RD07D *XM300001~
 | VP50B                          B | 
  | 2G | Germany (50 ps)
 | RD04E-3900001~ | JH2RD07B *XM300001~
 | VP51A                          B | 
 
    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Model | Area code
 | Type | Applicable engine serial No.
 | Applicable frame serial No.
 | Applicable carburator identification              No. | 
  | XRV750             2000 
 | AR | Austria | RD04E-5810001~ | JH2RD07C *YM410001~
 | VP50C                          B | 
  | E | England | RD04E-2910001~ | JH2RD07A *YM410001~
 | VP51A                          B | 
  | ED | European direct sales
 | RD04E-2910001~ | JH2RD07A *YM410001~
 | 
  | F | France | RD04E-2910001~ | JH2RD07A *YM410001~
 | 
  | G | Germany (Full power)
 | RD04E-2910001~ | JH2RD07A *YM410001~
 | 
  | SW | Switzerland | RD04E-2910001~ | JH2RD07D *YM410001~
 | VP50B                          B | 
  | 2G | Germany (50 ps)
 | RD04E-3910001~ | JH2RD07B *YM410001~
 | VP51A                          B |