Troy-Bilt TB90BC Operator's Manual page 25

Engine Type .................................................................... Air-Cooled, 2-Cycle
Stroke ........................................................................ 1.25 in. (31.75 mm)
Displacement ..................................................................... 1.9 cu in. (31 cc)
Clutch Type ........................................................................... Centrifugal
Idle Speed RPM .................................................................. 2,800 - 3,600 rpm
Operating RPM (Trimmer) ......................................................... 6,100 - ]0,400 rpm
Operating RPM (Brushcutter) ....................................................... 8,200 - 9,600 rpm
Ignition Type ........................................................................... Electronic
Ignition Switch ............................................................... Momentary Flip Switch
Spark Plug Gap .................................................................. 0.020 in. (0.5 mm)
Lubrication ....................................................................... Fuel/Oil Mixture
Fuel/Oil Ratio ............................................................................... 32:1
Carburetor ................................................................. Diaphragm, All-Position
Starter ............................................................................. Auto Rewind
Muffler ......................................................................... Baffled with Guard
Throttle ..................................................................... Manual Spring Return
Fuel Tank Capacity .................................................................. 12 oz. (355 ml)
Drive Shaft Housing ........................................................... Steel Tube, EZ-Link
TM
Throttle Control ....................................................... Finger-Tip Trigger with Lock-Out
Unit Weight (No fuel, with cutting attachment, cutting attachment shield and J-handle) ........... 14 Ibs. (5.23 kg)
Cutting Mechanism ....................................... 4-Tooth Cutting Blade, Dual String Cutting Head
Line Spool .................................................................... Bump Line Releaser
Line Spool Diameter ............................................................. 4 inches (101.6 mm)
Trimming Line Diameter ......................................................... 0.105 inch (2.66 mm)
Cutting Path Diameter, Cutting Attachment ........................................... 18 inches (45.7 cm)
Cutting Path Diameter, Cutting Blade ................................................. 8 inches (204 mm)
Shoulder Harness ................................................................ Single Quick-Snap
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