I'm hoping for any ideas or advice regarding problems with my CB400 as I have been looking for common issues online and all I can find is there isn't any. Before we start I have very little mechanical knowledge to fix much. My CB is a 2009 with 13,500 Ks on the clock and I have done the last 1,500 since purchase and its 12,000 K service. I have done a few rides around 2 hours but last weekend on the ride up to Noojee about 100 ks in it started surging under power to me it feels like on an older bike with no/low fuel. I ended up trailering it home and did a little bit of tinkering and couldn't figure out any obvious issues, however when I had the tank off I thought a vacuum hose was off and I wasn't sure if this had happened whilst I was taking the tank off. So this week I went out riding again staying closer to home and same again about 1 hour into riding same again but worse so bad this time it would idle but even in neutral a quick hard rev would just die. Anyway any ideas or information would be helpful, If you would like any more info just let me know.