Thunder Tiger CORP. -- F-91S NO.9804


  1. 9804-manual9 MB


Item No. 9804
Displacement(c.c. / 14.97 c.c. / .914 
Bore(mm / in.) 28.3 mm / 1.114 in. 
Stroke(mm / in.) 23.8 mm / 0.937 in. 
Practical R.P.M.(R.P.M.) 2,000 ~ 12,000 rpm 
Output(BHP/RPM) 1.6 BHP / 11,000 RPM 
Weight(g/oz) 742.8 g / 26.20 oz 


1. F-91S engine x 1 EA 2. Carburetor Assembly x 1 EA 3. Allen wrench 3mm &2.5mm &2mm &1.5mm 4. Wrench 5/5.5 &12/14 5. Muffler Assembly x 1 EA 6. REDLINE RF glow plug x 1 EA 7. Instructional manual x 1 EA 8. TT logo sticker x 1 EA


Thunder Tiger Four Stroke series are manufactured by automated computer-controlled machinery, resulting in a product that looks and performs better. Special camshaft and oversize valves combine to improve performance and easy handling. Precision air bleed carburetor makes adjustments simple, and efficient mufflers keep things quiet at the field. Perfect for the pilot looking for the authentic aircraft sound.

The Thunder Tiger F-91S powerhouse engine is the perfect choice to enjoy the advantages of four-stroke performance; the ability to swing a large prop, increased torque, reduced noise and much improved fuel economy.

The F-91S features a twin needle updraft carburetor, black anodized cylinder head, oversized valves, and combines a high performance silencer to deliver the best power-to-weight ratio and awesome torque.


Black cylinder head
Crankshaft with Ni plating to further reduce corrosion
XC2 (extreme composite coating) cylinder liner with special criss-cross pattern etched
Lightened hypereutectic machined Al-Si ringed piston
High-strength connecting rod with bushings pre-installed
Dual ball bearing supported crankshaft
Rubber- sealed rear bearing to further reduce corrosion
Plain bearing supported camshaft
Fine polishing rocker cover
State-of-the art CNC machined components
Smooth manifold
Rear-mounted updraft and reversible carburetor
Black anodized muffler included
Redline RF glow plug included

Spare Parts List