tuning problems

[Westphalian]

hi all. just doing an autumn clean and maintain on my chainsaws and the one I am having problems finishing is my oldest, my husq 455 rancher. I cannot get to 9000 revs (the recommended) without bogging. it's either 12-13000 or bogs. I use regular fuel with preservative rather than Aspen etc. I'm supposing I need to clean the carb??
Thanks

[beenthere]

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