Floating rods and pins
 

Has anyone converted stock rods to floating ones? I've heard that full floating = less frictional losses. I'm wondering how difficult the conversion of rods and pins would be for a beta engine.

Not difficult at all if you are a machinist who knows what to do. For someone buying parts, you just have to find that machinist and convince him to do it! Fully custom rods and pistons are a thing, and you can have any configuration you want - if you are willing to pay for it.