[tyman150]

i want to know what a big bore kit is and what it does for you bike thanx

[04 crf450]

a big bore kit increases the displacement of your motor. for a 150 the most common is a 175cc kit (correct me if im wrong) it is an excellent way to gain power. heres a link
http://www.bbrmotorsports.com/Products/Products.htm[/url]