MEPHISTO.21 GT5/H configuration:
   Displacement: 3,49 cc
   R.P.M. (max power): 41.300 RPM
   Bore x stroke: 15,88x17,60 mm
   Sleeve: 5 ports
   Rear ball bearings: ceramic
   Front ball bearings: steel
   Crankshaft: 14,5 mm - turbo - tuned - DLC
   Carburetor: plastic 9mm - reverse 3 adj.
   Glowplug: Turbo (CT8)
   Exhaust position: rear
   Starting: standard
   Weight: 365 g
   Fuel type: 16% nitro

Available versions:
with front and rear steel ball baerings (MEPHISTO.21 GT5/A)
rear ceramic and front steel (MEPHISTO.21 GT5/H)



r4 18   85028   16007   doppia reg meph off
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.
The crankshaft is grinded to increase the mixture flow and has a special shape to reduce turbulences inside the crankcase. The balancing is done by three inserts made of tungsten alloy and the inlet has a silicon filling to reduce the weight of the crankshaft to improve acceleration. The durability has been significantly improved with the DLC coating.
  Rear ball bearing:
Rear ball bearing:
The rear ball bearing has high quality ceramic balls to minimize wear and inertia to improve acceleration and fuel consumption.
  New compact carburettor:
The new three tuning needles gives a better idle and improves the ability of the engine to return to low rpm after throttling.
08581   nitromethane16 25   scarico meph21 on   air flow 21 on
The sleeve has 5 transfer ports and an exhaust with booster ports. The special shape and positioning of the ports improve the internal fluid-dynamics to obtain the maximum possible performance.i.
The underhead designed to work with a mixture of 16% nitromethane (code 28038), but optionally the engine can be supplied with a underhead to operate at 25% (code 28025).
Improved internal machining of the crankcase drainage port to facilitate the expulsion of fumes.
  Cooling head:
New head, redesigned to improve the flow of air and thus increase cooling and ensuring an optimal center of gravity.
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