Hi all, I'm trying to upgarde my bike to 62mm (175cc) with stock valve. Im using uma brand for cylinder kit. Now i want to help something. 1. I'm using vixion valve spring for 12rpm limited is ok? 2. What is the camshaft size? Camshaft brand can fit for daily used. 3 what is the best of ECU. 4. How about sprocket final? 5. About spark plug, airfilter. Ignition coil. Top speed require about 15xkph. And all modifing can durable? Im ride 70km per day. Thank all.