Features :
- Thunder Tiger 9190 PRO .91 Ring w/o Muffler
- CNC machined construction for precise tolerances
- Front and rear ball bearing supported crankshaft with Ni plating to reduce corrosion
- Hypereutectic machined Al-Si ringed piston
- Dual needle valve carburetor
- Redline R2 glow plug
- Forged aluminum connecting rod with dual bushings
- Nickel-plated cylinder liner with special etched criss-cross pattern
- Schnuerle-boost combustion porting
- Three year limited warranty through Hobby Services beginning at date of purchase

Specifications :
- Displacement: .91 cu in (14.97cc)
- Bore: 1.102" (28mm)
- Stroke: 0.957" (24.3mm)
- Practical RPM: 2,000 - 16,000
- Output: 2.75 HP @ 15,000 rpm
- Weight: 19.83oz (562.2g) without muffler
- Crankshaft Size: UNF 5/16-24
- Carburetor Settings-NOTE carburetor is preset from the factory and requires only small adjustments
- Needle Valve: 2 - 2-1/2 turns counterclockwise from closed
- Idle Mixture Adjustment: After setting needle valve, 30° clockwise if mixture is too rich or 30° counter-clockwise if mixture is too lean-never turn more than 30° at a time or one full turn total
- Height from Mounting Tab Bottom to Top Cylinder Head: 3.3" (83.8mm)
- Height from Crankcase Bottom to Top of Cylinder Head: 4.16" (105.6mm)
- Width at Mounting Tabs: 2.4" (62.3mm)
- Width of Crankcase below Mounting Tabs: 1.7" (43.2mm)
- Center of Mounting Holes Same Side: 0.98" (25mm)
- Center of Mounting Holes Opposite Side: 2.05" (52mm)
- Center of Crankcase to Drive Washer: 2.64" (67mm)
- Distance from Backplate Screw to Drive Washer: 4.18" (106.2mm)

Package Contents :
Thunder Tiger Pro .91 2-Stroke Engine with glow plug, carburetor, 1.5mm, 2.5mm and 3mm hex wrenches, decals and instruction manual