THOR 202 Security Alert

July 17, 2023
whole image of motor black in color
Thor 130

THOR 202 Security Alert

Belleville Spring preload of the centrifugal clutch

During some scheduled control tests on Thor 202 we detected a possible defect in the preload of

the centrifugal clutch Belleville springs in engines with serial number between 929*07038 and


Due to the low preload of the springs inside the clutch weight, the propeller keeps on turning even

at 1800 RPM

Although this defect does not present a safety problem during the flight phases, Belleville springs

must be replaced; if not replaced they could cause the clutch breakage with a consequent much

more invasive maintenance.

For any further information please contact your official Polini dealer who sold you the Thor



Leave the first comment