cylinder kit Airsal sport 81.3cc 50mm for 139QMB, GY6 50cc, Kymco 50 4-stroke

81.3cc High performance aluminium cylinder kit from Airsal for 50cc 139QM GY6 Engines. Unlike cast iron cylinders, the aluminium cylinder offers much better heat dissipation making these kits less susceptible to wear or piston failure. Much improved performance in lower engine speed ranges and all in all, a very good quality kit. Supplied as per image with barrel, piston, ring, pin, clips and required gasket. Original head can be used. Notice: Due to the fact that the outer diameter of the cylinder is 54mm, in some rare cases the opening on the crankcase need to be modified slightly to create enough mounting space. By purchasing this item you should be prepared in case this is required.