I just had my top end bored .002 and got a new piston and rings for the bigger size. I put everything back together and pushed the kick start with my hand as the manual says to do. It seems to be pretty tight but I could tell that the piston travelled up and down a few times. Is is normal for it to be difficult to push with your hand? Also, I got a bigger carb because I could not fix my old one. The new one doesn't seem to fit on the end that comes from the air box. Is there an adapter that I need or something else to make it work?