Hi so I built a 2 stroke motorized bike and it's been sort of a pain so far but it was finally working good but then I took it out yesterday and I would get up to speed then drop the clutch and give it gas and it seemed like it started but really weak then when I give to more gas it comes to a stop, so I took apart my bike and replaced the bottom cyclinder gasket because I thought that was why it wasn't starting but I got the same problem. As soon as I try and start it it starts but there is like 0 power produced. Also if I try and pull in the clutch to let the motor idle it dies right away. I haven't messed with the carb at all after I got it to idle right when it ran so I have no idea what's going on. Also when the bike "started" yesterday it would rapidly slow the bike down then start sputtering. I don't know if this is important but when I took apart the motor yesterday the plug was black. I am on my 2nd tank running 16-1. Please help me I'm getting frustrated and don't know what to do. Thank you.