Hello from Humboldt Co! I sure am glad and thankful for this awesome forum.My name is Sean, i live in northern Cali. and am also a full blown motorized bicycle junkie! I also have serious mechanical issues,I put a upgrade piston from crmachine, stage 2 head,and NT speed carb.Both test rides resulted in seize.BUT,not in the top end?both rides no farther than quarter mile. Any thoughts and suggestions much appreciated.