Out of stock

Designed to achieve the easiest operation and max performance over & over, the new PRO-21BX-R delivers an awesome raw power & durability The new webbed reinforced compact crankcase is made for added wearing resistance and provides effective heat dispersion for longer runs.

All PRO series engines are manufactured by automated computer-controlled machinery, using the highest quality materials and state-of-the-art CNC manufacturing techniques to deliver a powerplant that looks and performs better. Precision mixture control carburetor makes adjustments simple, the crankshaft is lightened, and balanced to achieve a smoother and more efficient fuel mixture.
The new 21 engine fits in the same mounting as the original .21/.28 engines, with no additional weight - but delivers greater output and higher practical rpm.

The Pro-21BX-R is equipped with a built-in recoil starters ("X" type) for easy and quick start

Rear exhaust
ABC construction: Aluminum piston with Cr-plated brass cylinder liner
Hypereutectic machined Al-Si ringed piston
High-strength connecting rod with bushings pre-installed
SG crankshaft
One-piece crankcase with squared-off cooling fins
Dual ball bearing-supported crankshaft
Machined over-sized heat sink head
Built-in pull starting backplate
Three-needle valves slide valve carburetor
State-of-the-art CNC machined components

Displacement(c.c. / 3.49 c.c. / .213
Bore(mm / in.) 16.26 mm / 0.640 in.
Stroke(mm / in.) 16.8 mm / 0.661 in.
Practical R.P.M.(R.P.M.) 3,000 ~ 36,000 rpm
Output(BHP/RPM) 2.15 BHP / 30,000 RPM
Weight(g/oz) 460 g / 16.23 oz

More Information
Part # 9436
Brand Thunder Tiger
Fuel Type Nitro / Glow
Type 2 Stroke
Vehicle Type Car