The coolest motorcycle with the least powered engine is all about the RC 125. You just can't beat this machine. It looks pretty awesome and priced very affordable. Above all it's very fuel efficient as well. Looking just like its elder siblings, the RC 200 and the RC 390, the bike gets attention and respect wherever it goes through. The baby RC is powered by a 125cc, 1-cylinder 4-stroke engine, water-cooled, which s=is capable to deliver a max power of 15 hp. It's coupled with a 6 speed, claw shifted transmission.