The PRO engine series feature aerospace-technology ball bearings for supporting the crankshaft at high RPM while the Schnuerle-boost combustion porting delivers greater power & fuel economy. The Pro Series engines are equipped with twin ball bearings, twin needles & ABN-type piston & cylinder for years of trouble-free performance. All Pro Series engines deliver exceptional power-to-weight ratio & value, making them fantastic 2-stroke power plants for model airplanes. The latest Pro-91 is a ringed-type engine equipped with a massive forged aluminum connecting rod & dual bushings. Its unique "squared" cylinder head design allows for cooler runs. Note that the pro-91 requires a muffler sold separately. (No. TT9225)
Features: Side exhaust ABN construction: Aluminium piston with Nickel-plated brass cylinder liner Hypereutectic machined Al-Si ringed piston High-strength connecting rod with bushings pre-installed One-piece crankcase with squared-off cooling fins Dual ball bearing-supported crankshaft Vertical fins heat sink head for optimum air cooling 2 Needle valves carburettor Swept back needle valve for added safety adjustment State of the art CNC machined components Redline R2 glow plug included Specifications: Displacement: 14.96 cc. / 0.913 cu. in. Bore: 28 mm. / 1.102 in. Stroke: 24.3 mm. / 0.957 in. Crankshaft: UNF 5/16 / 24 Practical RPM: 2, 000 ~ 16, 000 Output: 2.75 BHP / 15, 000 RPM Weight: 562 g. w/muffler / 19.83 oz. Product Name/ Code:PRO-91 TT9190 Manufacturer: Thunder Tiger