Maxi kit "TPR" by TOP PERFORMANCES aluminum diameter 50mm and 44mm long ride for scooters with minarelli horizontal liquid engine. Diam.50mm single-beam piston and 1mm chrome band. Decomposed aluminum conical trunk head with calculated squish, 12mm plug, tpr full-shoulder crankshaft with 85mm 44mm long stroke connecting rod and 12mm plug, displacement 86.35cc WARNING: Before proceeding with the assembly of the thermal group, you must bare the engine crankcase to allow the cylinder to be insert, bringing the in-depth diameter to 56.7+00.1mm for a depth of 19mm. To allow the engine tree to be lured, it is necessary to bare the 2 semicarters at 76.5mm in diameter