STIHL has learnt that a limited number of TS 410 and TS 420 cut-off machines in the below noted serial number range were assembled with the flywheel-to-crankshaft connection over-tightened. Overtightening of this connection may damage the flywheel, which could cause the flywheel to fail and break apart while the engine is running. A failure during the operation of the machine would pose a projectile hazard to the user or a bystander. A damaged flywheel is not apparent from a visual inspection.
Machines in the following serial number range are affected: 189442634 - 190001700
If you own a cut-off machine TS 410 or TS 420 in this serial number range,
please discontinue using the machine immediately.
Please contact your local STIHL dealer for a flywheel replacement. This repair is free of charge for you. We ask for your understanding for this precautionary measure. Please take this action in the interest of your own safety.