Me and a buddy recently purchased CRG shifter Karts, both with cr125 engines as we are looking at getting into the sport. I ran my kart the day we purchased it in a local parking lot until it ran out of fuel. Only ran for a few minutes until it died from no fuel. Ever since I added fuel, it is a bitch to start. When we do a push start and pop it into first and try and start, it seems to bog down and die. My buddy thought I was flooding the motor when I was trying to start because I would hit the accelerator to the floor once I popped the clutch but if I get into his kart and do the same thing, his will fire up and run. Only difference in his Kart is he has a duel fuel pump setup. sometimes we can get it to start and once running, it runs flawless. Then once we turn it off, again it is a bitch to start. On the stand, I can get it fired up on the first pull in third gear when cold. if I let it run for about a minute and then shut it off, I can't get it restarted. Seems I have to wait until the Kart gets cold. Kart has a pump around carb system. I added a gallon and half of C12. Used 2 oz of Motul oil per each 1/2 gallon. (filled 1/2 gallon at a time). When I pulled the plug the last time after it ran, the plug was wet. Any advice or recommendations? We both think it is something stupid causing it to be a pain to start. Want to work this out before we get them to the track as I don't want to be having a issue trying to start it.