BBK Crankshaft killer?

[flu]

Thanks all for the responses! I had done a 47mm kit on my t3 before the crate motor it all went together and ran well with the jetting for the 50cc set up. It ended up blowing up literally after I ordered an #38 idle jet. The problem was I received a #50 but was too excited to notice until I had it in and all was not well. Spitting unburnt fuel out the exhaust and it back fired a few times. I didn't run it long like that but the damage had already been done. Since there was a giant hole in the bottom of my crankcase I decided to just get a crate 72cc from scrappy! I've been very pleased with that displacement for my t3 ,but I feel that my ruckus clone will need more umph! but of course don't want to tear up the bottom end.