Hi there, I have a 2001 CB 250 (ex training bike) reasonable working condition. Some smoke coming from exhaust, dents in fuel tank, minor rust, etc. she needs some attention. So I'm thinking a rebuild may be in order.( good learning ground for me also). My question is to the experts on this site who may help with their wisdom of experience. I'm thinking of building a more cafe racer style of cb. I only purchased the bike for $900 so I figure spending another $1500 or so might leave me with a half decent bike I may hold onto for a while. I read somewhere I can bore out the pistons to 400 spec. If so Is it worth the spend, will it give any noticeable power increase? Any dramas with rego / insurance if I do this? Thanks.