Justme101, when I had a bike I spent money on it all the time cos it kept breaking down, it was knackered really, and I couldn't really afford the parts, but it gave me independence and helped me get my shopping home. I never wanted to move up to a bigger CC, mine was a 125, but I wish it had been reliable then I may have ventured further on it.    I reckon if you use the bike a lot then it's worth spending money on no matter what cc it is, or what age, and if you don't want to get a bigger cc then don't, don't let others push you into it.