KEEP.21M


   Displacement: 3,50 cc
   R.P.M. (max power): 42.800 RPM
   Practical range: 6.000-44.000 R.P.M.
   Bore x stroke: 15,88x17,60 mm
   Sleeve: 9 ports
   Rear ball bearings: ceramic
   Front ball bearings: steel
   Crankshaft: 14,5 mm - turbo
   Carburetor: aluminium - 9 mm - rotary 
   Glowplug: Turbo (C8TGH)
   Exhaust position: rear
   Starting: -
   Weight: 321 g
   Fuel type: 25% nitro
download-exploded-view
carburetor-setting
instruction-manual

Also available with rear and front ceramic ball bearings.


FEATURES

biella-R7   08569   85021t   13021
Conrod:
The R7 conrod is made from a superlight alluminium which has been checked ultrasonic. The specific form of the R7 creates little turbulence inside the engine while running.




  Sleeve:
The sleeve has 9 transfer ports and an exhaust with booster ports. The special shape and positioning of the ports, covered by a patent, improve the internal fluid-dynamics to obtain the maximum possible performance.



  Crankshaft:
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 ball bearing was lowered to 5mm.
  Rear Cover:
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.




 

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