Description: The MS 311 is a high-tech workhorse with a step up in horsepower and features over the MS 291. With our improved engine technology, you get higher fuel economy for longer run times. The MS 311 also has larger fuel and oil tanks for even longer extended use. Youll stay productive while youre saving money on fuel. With the MS 311s fuel-efficient, high-powered engine, youll reduce your down time on the job so you can enjoy your own down time when the job is done.