DOUG, GO TO DEANS VINTAGE PAGE AND SEE THE SHOTS OF MY SRX,s !! I RACED THEM FROM 1976 UNTIL 1995. I THAN BOUGHT MY VMAX 4. I,LL GIVE YA QUICK CRASH CORSE. YAMAHA MADE THE SRX FROM 1976 UNTIL 1982. ONLY ONE YEAR THEY WAS A 340 SRX IN 1976, THE REST WERE 440,s.!! THE FIRST TWO YEARS WERE THE WHITE ONES. THE 1977 SRX 440 WAS A SLED THAT LEGENDS WERE BUILT ON. THEY WERE 100 H.P. STOCK AND WEIGHTED 337 POUNDS. NOTHING COULD EVEN COME CLOSE. THIS SLED ONE EVERYWHERE YAMAHA RACED IT. IN 1978-79-80 THE SRX BECAME MORE TRAIL FRIENDLY. HP WAS DROPED AROUND 80 WITH A RUBBER TRACK, LARGER GAS TANK, SMALLER CARBS AND EVEN OIL INJECTION IN 1980. STILL THE SRX WAS THE FASTEST SLED YOU COULD BUY. IN 1981 YAMAHA DEGINED THE FIRST TSS SRX AND GOODBYE TO THE OLD LEAF SPRING FRONT END. THE 1981 SRX WAS A STORMER, BUT EVERYDAY SNOWMOBILES COULD NOT PUT UP WITH ITS DIRT BIKE ENGINE. YAMAHA TRYED MANY DEFFERENT UPDATES TO TRY AND TAM THEM DOWN, BUT IT TURNED OUT TO BE A PROBLEM CHILD. IN 1982 THE SRX BECAME A 500 cc STORMER, BUT STILL HAD SAME BUGS AS 1981. YAMAHA DECIDED NOT TO RELEASE IT. THAN IN 1983 THE VMAX 540 CAME OUT AS THEIR NEW FLAGSHIP SLED. TODAY, IN ORIGINAL CONDITION, ANY OF THESE SRX,s ARE WORTH ALOT OF MONEY, ESPECIALLY THE 77. I HAVE A 1980 SRX THAT I BOUGHT NEW, I LOVE THAT SLED AND PROBLEY WOULD NEVER SELL IT !! HOPE THIS HELPS YA SOMEWHAT! 3:16 (tony)