It looks like I'm going to need to replace the crank seal on my 05 125sx because it's burning gear oil. What is the part I need on this page? 70 or 71? I'm not sure which side is which. http://www.motosport.com/dirtbike/oem-parts/KTM/2005/125SX/CRANKSHAFT%2C-PISTON?fam=Engine Any tips on replacing it? I was looking at another thread, but it wasn't very specific.