Righto people, I did a search on this problem and couldn't find anything so here goes (sorry if it is there mods) My bike has been behaving badly of late. It started playing up a few weeks ago. I had just switched back to normal fuel (I usually run premium) just for fun and it really "seemed" to make a difference. It was pissing me off the lack of response and crappy fuel consumption (30km less out of a tank) so I went back onto premium a few days ago but its still running like crap! The problems are: 1. Poor throttle response (especially in first) 2. I now have to grab the front brake really hard to slow down. 3. Bubbles on top of the oil, when I tip the bike back onto its side stand, the bubbles remain on the view port. 4. Call me paranoid but there also seems to be a funny hissing noise coming from the engine. My thoughts are that the last batch of fuel really fouled up my engine or something has gone wrong with my front brakes and they might be slightly engaged while riding. The bike just had a oil change 300km ago and the brakes were bled 3000km ago. HELP! I hate it when my bike is broken. The lack of riding is giving me a twitch.