I had a similar issue with my 2014 Honda CBF125. I know nothing about bikes but from googling, it says it could be the fuel pump. Dose the throttle lose rev and it stalls on a warm day? It only started happening when I'm slow in traffic or at a stop and trying to start up again. Another thing I read was that if you've changed the exhaust, get it tuned because sometimes it pumps too much air into the engine and it's most felt if it's a warm day. I took my bike to a local garage but they said there's absolutely nothing wrong with the bike or the fuel pump. No pressure in the fuel tank because there's no hissing when I open it either. I put it down to overheating + fuel pump issue. This is the closet article I found that resembles my issue: https://cbf125rider.wordpress.com/2011/06/27/the-dreaded-kangaroo-hopping-problem/ Hope this helps! Let me know if you got it fixed because I'm interested and worried about my bike too!