I just recently bought a 1985 LT250R. It is a project for sure. Crank is shot and piston is melted but it was dirt cheap and came with a brand new FMF and aftermarket Keihin. Now the problem is that I'm new to the LT's. I see their engines are classified by a letter designation. How do I find this? And how do I fix the common crank problem? Thanks guys!