I've got the 250 4t evo and love it but I really struggle with making it grip, once it gets hold it's superb but from a standstill - hmmmmm!!!! It's fitted with dunlops which probably doesn't help so I'm thinking of fitting a new rear, any thoughts would be appreciated, especially re the x lite. A friends just put an IRC on his 2t but is struggling to get it to seal properly, is this common? Cheers for any advice....