i bought a used banshee from a guy who was in need of money awhile back, i had always ridden 4 strokes and have never been into drag racing unless for shits and giggles. the bike came with a t-rex top end and needed crank seals bad. oil was coming out the exhaust and muffler packing was soaked in oil. fixed that problem and then i had to spend a hundred dollars in jets trying to get the jetting right. once i "thought" i had the bike running good i raced one of my friends, who has a 400cc quad with a big bore kit making it a 440cc, and he stays right next to me when drag racing. sometimes he even wins. so i started doing some research because i thought, "if this t-rex top end is all that" and so expensive, how come i cant smoke a 440cc suzuki right? i read on a site that sells the t-rex top end and it says you need to run a 4mill crank with 115 long rods, so i asked the previous owner if it had a 4mil, he said no, stock crank with long rods, so is my bike slow cause of this? im running the recommended 35mm carbs and even very close to factory recommended jetting. now im trying to figure out if i just wanna sell the top end and buy a used stock one, or spend the loot putting in a 4 mil in and see how it runs, like i said i dont drag for competition, i mostly trail ride and dune. ive already spent alot of money in the suspension making it trail worthy, now i gotta figure out what motor i should run, funds are tight cause of x-mas and just paid my tuition off, so what should i do, if i sell the top end how much could i get? with the stock crank and long rods could i bore out some stock cylinders and get good power, i like alot of torque, plus i wanna smoke them 4 pokes when i drag for fun, any advice would be great.