This OEM Tanaka clutch assembly is a direct replacement for worn or slipping clutches in Tanaka/Yamabiko brushcutters. It’s designed to engage progressively, minimising chatter at low revs and delivering positive drive as you throttle on. Use it to resolve symptoms such as head not spinning until very high rpm, persistent slip under load, or a burning smell from the clutch area.
The 2770730090 assembly is referenced by Australian parts suppliers for TBC‑290 and TBC‑340 series models. As Tanaka and Shindaiwa share Yamabiko heritage, some parts interchange across platforms; always check your unit’s illustrated parts list by model and serial number before ordering.
Best practice during replacement is to inspect the clutch drum, springs and crankshaft taper for heat marks or grooves. Replace the drum if it’s scored, and clean the taper seat before installation. If the unit has been oil‑contaminated, also check the crank seal and gearcase for leaks to avoid premature clutch glazing.