Echo SRM-225i Straight Shaft Line TrimmerThe 225 Series of Trimmers features a whole new look to the 21. 2cc engine and is available in a variety of configurations: Standard with an i 30 starter (SRM 225 and GT 225), with an i 75 starter (SRM 225i and GT 225i), split boom (SRM 225SB), or "U" handle (SRM 225U). Common features to all include: a 21. 2cc Power Boost Vortex engine for plenty of trimming power, i 30 technology to reduce starting effort by 30%, a built in arm rest and spark plug