As a part of the Honda VersAttach™ System, the UMC425C/UMC435C powerheads are powered by the Honda GX25/GX35, Mini 4-stroke engine. Compact and lightweight, it offers easy starting, low engine noise, minimal vibration and superior fuel economy. It delivers the ‘starts-first-time, every-time’ reliability Honda is known for and offers superior performance when the UMC425C/435C powerheads are paired with one of the multiple available lawn and garden tool attachments. The world’s lightest OHC engine, the Honda Mini 4-stroke engine requires no fuel/oil mixing and runs at approximately half the operating cost of comparable 2-stroke engines. Also, it offers full 360° “any-side-up” operation, which means you can use and store the UMC425C in any position and take advantage of the exclusive rotary-slinger lubrication system. A lightweight and ergonomic design with legendary Honda power results in trusted performance you can count on, day in and day out.