Here is the brand new 50cc DOPPLER kit called Vortex for DERBI Euro 3 and 4 which is the evolution of the ER1. First of all let's start on the design, as we can see it is unlike any 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 the others. The cooling is obviously improved thanks to the new architecture!
This kit is 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 intake transfers are 5 in number and they are redesigned for more performance / better filling. We prefer a simple but efficient system than a complex system with 6, 7 or 8 transfers, often fragile and rather commercial!
The cylinder head is a polished hemispherical model with the studied shape which will guarantee an optimal combustion. This cylinder head allows you, if desired, to reconnect the antifreeze to your carburetor. This cylinder head provides excellent compression ratio.
The piston is a VERTEX model, very high quality and silicon content accompanied by two chrome segments 1mm thick to push to the maximum in high speeds (friction reduction) while maintaining good torque. Doppler recommends running a 300 km break-in and using DOPPLER racing 2t oil or IPONE STROKE 2R at 2.5% with super unleaded 98.
In summary, this kit will make you gain in performance without neglecting solidity . It will therefore be excellent for the road and for competition. We really appreciated the very worked channels on this vortex model ....
We advise to accompany this kit with at least : reinforced crankshaft, bearings, unclamping coil, racing exhaust, racing valves and carburetion 17.5mm minimum 21mm for proper use, spark plug B9 or B10, alignment of cylinder / crankcase transfers recommended!
The pack contains :
Piston Ø39.84mm mono-segment 12mm axis
Aluminum cylinder with 5 transfers bar
two hard chrome domed segment Ø39.84X1mm
Polished hemispherical cylinder head Ø39.84mm
Cylinder head screws
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 to the piston and the bottom of the skirt is also included in this modification. Allow 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 RCR - SMT 50 2T LC (DERBI D50B0)
And many other machines.
