Bore bike engine?

Yamaha 125r, is it possible to bore it out?

11kw. weak

Yes you can, there are 150cc kits for the bike.

Have a browse - http://www.yamahar125.com/forum/

when did this come out ? the bike lol.

wow, i wonder how much gained hp it nets

prob not enough to justify the price it would be to do it

remembering that its a learner specific bike.