I am fairly new to dirtbikes as this is my first, but this is defintely not my first bike. This will be my third motorcycle build and I am quite excited. A few questions: I'm trying to update the look of the bike a little and would like to know the newest plastics that will fit. From my understanding 2003 wr426 plastics and tank will fit the bike and give it better ergo. I would like to replace the fan shrouds fork covers, evertying, the stock plastics are pretty beat up. I'm assuming this bike has never been properly maintained as I do with everything I purchase so i'm going to do the timing chain, is there anything else that should be replaced along with it? In car engines you usually replace the timing chain guides but in this case the guides cost $150 so if I can get around it I'd like to but i'll see what they look like once I get it apart. A question regarding the new 2012-2013 wr450f, does anyone know how the efi system senses cam/crank position? No more carburators for me, I rather have an excel spreadsheet over jet changes.