I have a brand new engine with a centrifugal clutch, pull start, and shift kit. The pull start is because i can't turn the engine over pedaling because the shift kit gears down the power from pedaling so much. I also had to make a makeshift intake because the engine fits too high up on the frame. I made it from copper pipes jb welded together. It's a little longer (about 2 inches) than stock but they make extended intakes so i didn't think it would be an issue. I'm getting spark and gas it getting into the cylinder. I've pulled on the thing for about half an hour. I don't know how much pulling needs to be done to start it for the first time if anyone has a pull start that's done this before. Or if there's an actual issue with either the homemade intake or something else. Any help is appreciated, thanks!