Plz Help. Need to make my bike faster and better

cheap helps - grease your hubs, clean and oil the chain, take off head and get a sheet of 400 & 800 grit wet sandpaper, lay it on perfect flat surface and wet lap the head just a tiny bit. run 40:1 gas oil ratio, increase tire pressure.

but like ppl have said ^ you ain't gonna go 50 without a better carb, expansion pipe and tuning