The Stihl MS640, MS650, and MS660 are professional-grade chainsaws engineered for demanding tasks. These models feature robust 2-stroke gasoline engines, with displacements ranging from 72 cc for the MS640 to 91.1 cc and 91.6 cc for the MS650 and MS660, respectively. Their power outputs vary from 4.4 kW (6.0 bhp) to 5.0 kW (6.8 bhp), providing ample performance for heavy-duty cutting. Designed for reliability and durability in professional forestry and arboriculture, these chainsaws offer direct drive systems for efficient power transfer and are built to withstand rigorous use.

This workshop manual provides comprehensive guidance for the maintenance and repair of the Stihl MS640, MS650, and MS660 chainsaws. It covers essential procedures such as recommended service intervals for spark plugs, air filters, and chain sharpening, as well as specifications for fuel-oil mix ratios and bar and chain oil types. The manual is an indispensable resource for owners, technicians, and mechanics, detailing technical specifications, troubleshooting advice, and safety guidelines to ensure optimal performance and longevity of these powerful tools.

The Stihl MS640, MS650, and MS660 are professional-grade chainsaws engineered for demanding tasks. These models feature robust 2-stroke gasoline engines, with displacements ranging from 72 cc for the MS640 to 91.1 cc and 91.6 cc for the MS650 and MS660, respectively. Their power outputs vary from 4.4 kW (6.0 bhp) to 5.0 kW (6.8 bhp), providing ample performance for heavy-duty cutting. Designed for reliability and durability in professional forestry and arboriculture, these chainsaws offer direct drive systems for efficient power transfer and are built to withstand rigorous use.

This workshop manual provides comprehensive guidance for the maintenance and repair of the Stihl MS640, MS650, and MS660 chainsaws. It covers essential procedures such as recommended service intervals for spark plugs, air filters, and chain sharpening, as well as specifications for fuel-oil mix ratios and bar and chain oil types. The manual is an indispensable resource for owners, technicians, and mechanics, detailing technical specifications, troubleshooting advice, and safety guidelines to ensure optimal performance and longevity of these powerful tools.