TPR Racing 84mm 305cc Big Bore Kit for Honda CBR 250 – Steady Garage
Honda Cbr 300 Big Bore And Head Package Kit | eBay
Honda unveils CBR300R sportsbike - webBikeWorld
Ari Henning - Ride a CBR300R, CB300F, CB300R, Rebel 300, or a Grom, Monkey or CRF250L with a 300 engine swap? You can go from 286cc and a paltry 10.7:1 compression ratio