I guess by the front exhaust pipe you are not in the USA.
I would start troubleshooting by first looking at your air filter. Is it clean? Next look at your spark plugs and spark plug wires. Then try getting gas from a different gas station, sometimes you get a bad batch of gas.
Does this happen when the motorcycle is fully warmed up? Or does it happen all the time when the bike is warm or cold?
I would ask other people on this forum, but it is possible your fuel pump is not working correctly.