Crankshaft, connecting rod assembly long race for DERBI euro 1 & 2

Here you will find a crankshaft long race for DERBI euro 1 and 2 for motorcycle GPR, X-TREM, X-RACE, DRD ... 50cc. Remember, the crankshaft has long run increase the engine displacement. They are not approved, they offer a clear increase in power and torque! They can be mounted on cylinders specially designed for a long run, but also on kits 70cc or 80cc standard, with a wedge ... If diagrams allow. Here are some ideas: original stroke crankshaft derbi euro 1 or 2: 40mm original rod size: 90mm diameter silk / worn Original roll: Ø20mm Cage original needle: Ø12mm X Ø15mm X 15mm length a 47mm diameter cylinder with an original race 40mm provides the engine displacement 69,39cc and operation is very far from the square called race. A 47mm diameter cylinder with a 43mm long stroke provides the engine displacement 74,60cc and operation comes a little more than the so-called square race. A 47mm diameter cylinder with a 45mm long stroke provides the engine displacement 78,07cc and operation is very close to the square called race. Remember that a cylinder which is designed for 40mm before being placed on a long race course must be verified, he will receive a hold of 1.5mm for a 43mm stroke for example, or a block of 2 mm for a 44 mm stroke ... And so on. The diagrams must therefore be higher! We must therefore look at the basic diagrams with standard 40mm stroke. Diagrams not to exceed are around 135/195 ° to keep a usable engine. The squish should also be checked, and for proper operation, planning work on the down lights so that the piston opens at PMB!