Need Help!

I am running Akra evo slip on's with Akra map...and for a couple
of weeks the bike has been running Great!!!

Yesterday on the way home from work if I crack the throttle hard
anywhere under 5-6k rpms it feels like it loads up for a sec or two
and then runs hard up to redline...all gears

where before if I was in second at 5k and nailed the throttle it would
shoot the front tyre in the air. Now just bogs then catches up.

Any ideas?

Hi
My SD has started losing water in the last week and its a lot. I was hoping it was just expired hoses because they started to turn white although I couldn't see any water leaking. But have just dropped the oil out and it's chocolate brown colour which to me means water in it. Is it definitely a head gasket if so how do I work out which one and could it be something like the water pump leaking through to the oil. Any help much appreciated!