Thunder Tiger USA - Pro .28BD-R Engine

Designed to achieve the easiest operation and max performance over & over, the new PRO-28BD-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-28BD-R is equipped with a built-in dual hexagonal & recoil start ("D" type) for easy and quick start.

A Closer Look

Features

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.

Specifications

Displacement: 0.282 cu in (4.63 cc)
Bore: 0.720 in (18.3 mm)
Stroke: 0.693 in (17.6 mm)
Practical RPM: 3,000 - 35,000
Output: 2.40 HP @ 30,000 rpm
Weight: 17.28 oz (490 g)