i have a 1995 lx with airsal 27 tooth sproclet techno estroil 15/15l carb uni filter and ported intake and exhaust. i was riding to day about 90 degrees outside and i reached my top speed witch is around the speedo once so passed 40 at zero again. after that, i went into my friends house and when i went back to ride it it would get to 35-40 and cut off then accelerate then decelrate in a very jerky way. what is the probelm help. is it the heat is it seized?