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 |