Crankshaft + high engine assembly composed of the DOPPLER ER1 crank assembly reinforced with solid masses, and the very latest 50cc DOPPLER kit called Vortex for DERBI Euro 3 and 4 which is the evolution of the ER1. First let's start with the design, as you can see it looks like no other high engine. The mold is totally different which is not unpleasant to see, on the contrary it will allow you to distinguish yourself from others. Cooling is obviously improved thanks to the new architecture!
This kit is made of very high quality aluminum, a high-end nykasil treatment to give you maximum strength. Then the exhaust is a bar model like most competition models, the admission transfers are 5 in number and they are redesigned for more performance / better filling. We prefer a simple but effective system rather than a complex system with 6, 7 or 8 transfers, often fragile and rather commercial!
The cylinder head is a polished hemispherical model with a studied shape which will guarantee optimal combustion. This cylinder head allows you if desired to reconnect the antifreeze to your carburettor. This cylinder head offers an excellent compression ratio.
The piston is a VERTEX model, very high quality and silicon content accompanied by two 1mm thick chrome segments to push to the maximum in the high revs (reduction of friction) while preserving a good torque. Doppler recommends running in for 300 km and using DOPPLER racing 2t oil or IPONE STROKE 2R at 2.5% with super unleaded 98.
We advise to accompany this kit with at least : bearings, unclamping coil, racing exhaust, racing valves and carburation 17.5mm minimum 21mm to exploit well, B9 or B10 spark plug, alignment of cylinder / crankcase transfers recommended!
The pack contains :
Piston Ø39.84mm mono-segment axis 12mm
Aluminum cylinder with 5 transfers bar
two Domed hard chrome segment Ø39.84X1mm
Polished hemispherical cylinder head Ø39.84mm
Cylinder head bolts
Reinforced crankshaft DOPPLER full masses
As an option we offer you a stage 1 preparation, this preparation is a modification of the channels and the exhaust port by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement of the piston and the lower skirts is also included in this modification. Count a little extra time for this preparation!
Mounts on all DERBI EURO 3 50cc motorcycle engines :
APRILIA RS 50 2T LC euro 2 2006-> ( DERBI D50B1)
APRILIA RS4 50 2T LC euro 2 ( DERBI )
APRILIA RX - SX 50 2T LC 2007-> ( DERBI D50B0)
DERBI Senda DRD PRO R 50 2T LC (D50B0)
DERBI Senda DRD PRO SM 50 2T LC (D50B0)
DERBI Senda DRD RACING R - SM 50 2T LC (D50B0)
DERBI Senda EVO SM 50 2T LC (D50B0)
DERBI GPR NUDE 50 2T LC 2006-> (D50B0)
DERBI GPR RACING 50 2T LC 2006-> (D50B0)
DERBI GPR R 50 2T LC euro 2 2012->
DERBI Senda X-RACE R - X-RACE SM 50 2T LC (D50B0)
DERBI Senda X-TREME R - X-TREME SM 50 2T LC (D50B0)
GILERA RC R - SMT 50 2T LC ( DERBI D50B0)
And many other machines.
