got a problem. only been able to take my bike out about once a week for about 3 months.today i took it out as normal after i gave it a well deserved clean,got fuel,but shortly into my ride i felt the bike just wasnt right.when i arrived at traffic it was barely ticking over.then as i give it throttle it just didnt go until about 5000 revs.i left it idle outside my house to hear anything wrong,it was just ticking over then it would rev back up to normal.but as soon as it did that the bike revs died and the bike cut out. 1.is it because i havnt put my optimeter on it for a few months. 2.could it be the fuel(shell premium) or could water have got in after iwashed it.help.