Suzuki RA410 Manual page 572

Clutch or Brake Return Spring Assembly
Evidence of extreme heat or burning in the area of clutch may have
caused springs to take a heat set and would require their replace-
ment.
POSSIBLE CAUSES OF BURNING
Forward and Direct Clutch Discs
Stuck or leak in check ball in clutch piston.
Damaged clutch piston seals.
Worn or broken seal rings.
Obstruction in solenoid valves or shift valves.
Disconnected speed sensor, solenoid or controller.
Leak in valve body gaskets.
Low line pressure.
1st-Rev Brake Discs and 2nd Brake Band
Damaged piston seals.
Obstruction in solenoid valves or shift valves.
Leak in valve body gaskets.
Low line pressure.
AUTOMATIC TRANSMISSION 7B-45