Thunder Tiger CORP. -- PRO-28BX-R NO.9477


  1. 947722 MB


Item No. 9477
Displacement(c.c. / 4.63 c.c. / .282 
Bore(mm / in.) 18.30 mm / 0.720 in. 
Stroke(mm / in.) 17.6 mm / 0.693 in. 
Practical R.P.M.(R.P.M.) 3,000 ~ 35,000 rpm 
Output(BHP/RPM) 2.40 BHP / 30,000 RPM 
Weight(g/oz) 460 g / 16.23 oz 


1. PRO-28BX-R engine x 1 EA
2. Carburetor Assembly x 1 EA
3. Instructional manual x 1 EA
4. TT logo stickerx x 1 EA


Designed to achieve the easiest operation and max performance over & over, the new PRO-28BX-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 28 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-28BX-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

Spare Parts List

Optional Parts List