You should have a rim sprocket clutch drum on a husqvarna 545. Original rim should be a SM7 ( small 7 spline ) 7-pin rim sprocket, oregon pn: 11892. For faster chain speed you can try for 8-pin rim sprocket, oregon pn: 11891. This could be a good choice if using nk-.325 chain.
Oregon speedcut bar 18" for nk-.325 chain with .050 gauge pn: 180TXLBK095
Chain for setup mentioned above husqvarna X-Cut SP33G 72DL pn: 581 64 31-72
This is great. Thank you for that detailed presentation. When I put all together Oregons Speed Cut 18 inch bar could be optimum solution for my Husky
At the end one more question:
If I have, as U mentioned small 7 rim sprocket onboard shaft, whose job was to pull 0.058 chain can it be used for 0.050 chain or I have to change it ?
Thank you!
Regards