I currently ride a 250cc bike but thought i would get a RVF400 as a project bike. As recommended here on the forum, I used Three Bond conditioner and this cleaned the carbies beautifully. So the carbies are good with no blockages and the floats are seating the needles well. My problem is that I cannot get the bike started unless I take out all plugs, make sure they are spotless and make sure the cylinders are dry. My petcock seems to be functioning correctly and the fuel only comes out of the tank when the engine vacuum is applied (eg when engine is running or when starting the bike). I can start the bike and it idles well. If i start the bike within a few hours , it is fine. If i leave the bike about 12 hours, I cant seem to start it . I tried starting with full choke and no throttle and if it does not start within about ten seconds, it wont start at all unless the plugs come out etc . The plugs at that stage are wet with a dark coating that smells of petrol. I used a small camera and inspected into the cylinders and they look like they have a lot of carbon deposits inside . I was wondering if three bond conditioner could be sprayed into the cylinders to clean them but I would like a member to tell me if that is a bad idea or not. Anyway, does anyone have a suggestion as to why the bike seems to flood as it starts? I tried some no choke starts and that also seems to fail to the stage that nothing happens and plugs are taken out and are wet. If the bike starts, it all idles well and warms up well etc. Thanks in advance.