Hmm , affraid my $$$ are on the 250 cc , don't know exactly why , but i haven't come upon a stock 300cc that can't be digested quite easily by a stock 250cc , well stock except for Dr Pulley sliders which although do provide an edge over std rollers , don't exactly give heaps more .I think most people that buy a 300 cc do so thinking that if 250cc is good , then 300cc has to be better , yet an one who graduates from 250cc up to a 300cc usually says that they didn't really go very far , both 250/300's are fine machines & if i couldn't have a 250 , then i would happily settle for a 300 cc. I personally think that the best power mod for a Quaser motor is KM's , the Quaser is a very different motor in respect that the further it goes , the harder it runs, 90,000kms & definately revving harder than it did at say 40,000kms , call me mad but thats the exact story of my 250cc .
Red ones always go faster but blue ones go pretty quick , but now blue ones are the way to go😄