The rear cover presents a round shape to
optimize the filling and reducing the dead spaces. the steel plate is
to reduce friction and to expand the lifespan of the conrod.
The sleeve has 4 transfer ports to supply a linear power output and to keep fuel consumption low.
The crankshaft is manufactured with a
larger bore intake to increase the mixture flow and has a special shape
to optimise gas-flows in the engine. The durability has been
significantly improved with the DLC coating.
The combustion chamber is
supported by an O-Ring which is placed between the combustion chamber
and the crankcase to reduce the vibrations of the combustion chamber.
New R4/18 conrod, redesigned and made with a
special aluminum alloy that allows it to have a high resistance while
maintaining the lightness and performance of the previous R4/17.
Rear ball bearing:
The rear ball bearing has high quality ceramic balls to minimize wear and inertia to improve acceleration and fuel consumption.
The three tuning needles gives a better idle and improves the ability of the engine to return to low rpm after throttling.
New head, redesigned to improve the flow of air and thus increase cooling and ensuring an optimal center of gravity.
Displacement: 3,49 cc
R.P.M. (max power): 36.500 RPM
Bore x stroke: 16,42x16,42 mm
Sleeve: 4 ports
Rear ball bearings: ceramic
Front ball bearings: steel
Crankshaft: 14 mm - turbo - DLC
Carburetor: plastic - 9 mm - slide
Glowplug: Turbo (CTO6)
Exhaust position: rear
Weight: 365 g
Fuel type: 25% nitro
51007 (EFRA 2135) tuned pipe - 41021 manifold. The 51007 EFRA 2135 tuned pipe, made in collaboration with Hipex, coupled with manifold 41021, allows to maintain the same consumption of the kit 9901/41021 increasing further performance.