Hey, my wife brought a rex 450 rs back from Deutschland. I just found out today that it is a Rex 450 rs. When we took it out of storage it wouldn't run so I put in a new battery, spark plug, cleaned the carb, changed engine and gear oil (refilled with fully synthetic), put on a new belt, reset the valve lash and cleaned the air filter. Since then I have put in 88 and 40 jets and installed a performance air filter. my top speed is a measly 35 kph. I forgot to mention that I de-restricted everything and there was no restriction washer on the variator.