My second gear :(

[rustydog]

So i have a 06 busa with about 13000 km's on it. I've noticed for a bit. Well it started in first then stopped now all the time in second. Its like there's power there than for a split second its gone and back. It will do this all the way throu second gear. If i accelarate hard or slow it still does it.
Any of ya guys have an idea what it might be.
PLZ and thanks