Spark Plug for 4AGE BT 20v engine is IK20.
For further information, u may refer this website
http://www.globaldenso.com/en/products/aftermarket/plug/basic_knowledge/heatrange/index.html
Hey guys, I am going ahead with a manual conversion on my 2002 trek. I am having a few issues finding what parts I need to do the conversion correctly. I will be using a an evo 7 5 speed gearbox and engine mount, but...