I was riding in my neighborhood in some crud the other day, rode for a couple hours and of course when I was about to head home I lost power. I was climbing pretty aggressively and there was a pop, engine revved way up and I had nuthing. I opened the hood/drive cover and the engine would rev, vibrate more than norm but the primary was just barely trying to move a bit but never moved the sled. So after 4 days trying to get help I finally got it home solo style (5 hour mission) Anyhow I know these cranks are known for failing, is that what u guys think I'm looking at?