Hello, I just recently put a new piston, rings and head on my sons PW50. Had the entire bike taken apart to clean and lube it. After re-assembly the bike started up fine after quite afew kicks. The problem is when I switch from "start" to "run" the bike goes all out full throttle. My first thought was a kinked throttle cable. I can still twist the throttle, it just does not increase or decrease the throttle response. I pulled the throttle cable out of the top of the carb numerous times, it seems like it has enough travel. Maybe stuck? Any help would be appreciated. Thanks!