A friend had the Triumph 500 Single w/ Chain Drive, it came out in the Mid to Late 70s To compete with the BSA 500 at the time - Very Low geared ,literally Pull Stumps with it ! Fun bike but wasn't built for speed !
Sadly I have very little experience in troubleshooting Starters -What comes in the Rebuild Kit that you haven't already checked or Repaired /Replaced ??
My Polaris plow blade has the Large Springs as well!
My Arctic Cat came with a Warn Winch which was Seized/Rusted up so I replaced it with a Badlands 2500
That should work better, I bought a used Polaris 4ft. Blade & adapted the mounts to fit the frame of the Arctic Cat by welding on some brackets ! It probably weighs close to 70 Lbs.+/-. Works Great ! I think I paid $75 for it! Hope this Helps!
Always "Dress" for the occasion! It's -2 here this morning! My Arctic Cat stays in the garage on the Battery Tender when not being used with HEET in the gas Tank!