Stihl SR200 Gas Powered Backpack Sprayer, 2.1 Gal, 27.2cc EngineStihl SR200 Gas Powered Backpack Sprayer, 2. 1 Gal, 27. 2cc Engine The STIHL SR 200 is a value priced backpack sprayer thats in a class of its own. It features a low exhaust emission, fuel efficient engine that delivers up to 20% better fuel economy than most conventional 2 stroke engines. Its easy to use with a one hand joystick style control handle and provides excellent control over rate and range of spray. And because its a STIHL, it uses high