So im just starting to get into dirt bikes and i thought i would jump in feet first with a rebuild. not the smartest move on my part, but things were moving right along till i hit a stump. Im rebuilding a 97 Suzuki RM 125 ( bought the bike with a blown motor for $60) and it needs a new crankshaft. i started looking around for them on line and realized there are like 4 different models of crankshaft. how do i begin to find the one that i need?