not really, take it up to 70 and it's a good size for running high end power still no mail from tweak
using a kwak z650 with z9 (900) carbs as a guide, oversize carbs are a liability if you take them too far. the bike in mention does about 20 to the gallon, smokes like it's a 2 stroke and won't rev. all because the carbs are too big. this is a bit extreme but re-jetting a 21mm carb to a 50cc barrel willmake the mix in wrong. can't think how to explain really.
ok as i am getting a brand new malossi 21mm carb wid malossi manifold for my scooter for £50 and its been used for 200 miles
thrown a 20.5 on a stock 50 with a pipe.. more top end power but alot less accell.. needs VERRY accurate setup
yes iv got a reverse fully derizzed, unlimited cdi, malossi multivar, cf reeds shall have a 70 on it wen i add the carb tho