For cutting fresh oak, beech and hornbeam logs up to 30cm in diameter and torn pieces made from these logs, at home in the yard I cut all of this with a Husqvarna 450ll/2025., I also cut old timber from a demolished wooden house (on which I almost destroyed the aforementioned guide bar because there was not enough lubrication with the original oil pump) on which I installed: a regulating oil pump + a bell for the ring transmission + a lamellar coupling + a transmission ring with 8 teeth + a plastic transmission of the oil pump all of it from HQ460 + a Stihl RS23 chain (I replaced sp33g) on an X-force 15"/.325/1.3mm guide bar, now I do all of this happily and contentedly without any problems with great pleasure and desire, so that the HQ450ll with the aforementioned modifications and the aforementioned chain feels and in reality can be seen a big difference compared to the original setting.
I don't know how it would all work if I increased the bar to 16"~18", should I reduce the transmission ring to 7 teeth + put the sp33g chain back, I really don't know and whether it would get better cutting performance with an enlarged guide but because with these described changes, better performance was obviously obtained I wasn't interested in further experimentation at the moment. What do you think and do you have any suggestions for further improvements?
p.s.
I removed the spark arrester screen from the exhaust