99% of the time when the connecting rod breaks the crank comes around and the crank pin hits the broken rod and mashes the bottom of the sleeve and eggs it in the bore, your best bet if you broke the rod is to replace the entire motor. Reason why I say this is because there is a very high chance that there is more wrong then just a broken rod ie: bad bearings, crank might have damage now also there can be a crack in the block that can cause a air leak that you might not even see. Sorry about the bad news. But you can always use Redcats Lifetime Engine Replacement Program. It can be found here http://www.redcatracing.com/informat...imeengine.html