Can really tell the difference after this set is installed! With this the Echo 90152 Repower kit my two Echo SRM- 265T. SRM- 266T Trimmer pdf manual download. View and Download Echo SRM- 266/ S operator' s manual online. SRM- 266/ S Trimmer pdf manual download. Echo srm 265t owners manual. View and Download Echo SRM- 266T operator' s manual online.Also for: Srbuild my carburetors every 2nd year to keep them running well.