The Mx B4R EU Edition. The finest OS Spec 2 out there. Pre run in at the factory.

Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.8 mm)
Practical RPM Range: 4,000-42,000
Output: 2.65 HP @ 34,000 rpm
Weight: 355 g
Includes: 21J carburetor, 6 mm and 7 mm carb restrictors, P3 glow plug, exhaust seal and dust cap set
Requires: glow fuel, muffler, tuned pipe and manifold

  Lighter crankshaft, with DLC coating, Tungsten weight and silicone-filled intake passage

  Modified piston and con rod that reduces overall weight

  Newly designed outer head with V-shaped fins for lower CG and more efficient cooling

  Dual-adjustable 21J carburetor for smoother acceleration and better fuel mileage

  A 6.5 mm restrictor is installed; 6 mm and 7 mm restrictors are included

Tuned and modified parts by Maxima: Sleeve, Crankshaft and Crankcase.