Features: 

• Carburetor: The offset carburetor position is patented and provides improved flow through the crankase intake, delivering improved fuel efficiency and a better power curve.
• Rear Ball Bearing: The design of the rear bearing features a narrow inner race, reducing the inertia of the rotating mass and increasing the engine's scavenging ability. The bearing, combined with the re-designed case provide increased throttle response and higher top speeds.         
• Coolinghead: The 'Lighter & Lower Evolution 2' cooling head has been drilled and milled out to reduce the mass of the cooling head, lowering the Center of Gravity of the engine/car. The use of 6 screws instead of 4 provides a better seal between the sleeve, head button and the crankcase.
• Crankshaft: The slugged/ramped tuned crankshaft improves balancing. This will reduce the vibration produced by the rotating and the alternating masses.
• Sleeve: The sleeve has 9 transfer ports and an exhaust with booster ports. The special shape and position of the ports is covered by a patent, and improves the internal fluid-dynamics to provide maximum performance.
• Backplate: The shape of the rear cover helps to optimize the crankcase filling and reduces dead space. The steel plate helps to reduce friction and increases the life of the rod.          
• Conrod: The R7 conrod is machined from super light aluminum that has been checked ultrasonically. The unique shape of the R7 rod creates less turbulence inside the engine.
• Gasket: The inner shape of the gasket has a new shape, and with that more material. Together with a change in material these gaskets are more resistant to high temperatures.

Recommended Tuned Pipes: 51009, 51010, 51011 
Recommended Manifold: 41015, 41016, 41017 

Recommended Glow Plug: 

• C7TGF: For ambient temperature - 32°F/41°F (0°C/5°C)
• C8TGT: For ambient temperature - 41°F/104°F (5°C/40°C)

Specifications: 
Displacement: 3.49 cc 
R.P.M. (max power): 41,000 RPM 
Practical Range: 6,000-46,800 R.P.M. 
Bore x Stroke: 15.88x17.60mm 
Sleeve: 9 ports 
Rear Ball Bearings: Ceramic 
Front Ball Bearings: Ceramic 
Crankshaft: 14.5mm - tuned - turbo 
Carburetor: Aluminum - 9mm - slide 
Glowplug: Turbo (C8TGH) 
Exhaust Position: Rear 
Weight: 336 g 
Fuel Type: 25% nitro