Your rotating (big ends) are out over a spread of 1.0g there if your numbers are accurate (173.7g largest, 172.7 lightest).... that's about 3x more than I would allow for a precision balance effort. Easy to fix, and worth fixing. The reciprocating weight really only counts for about 50% (the little end/piston assembly), but the rotating weight (big end, bearing, crank) are 'weighted' at nearly 100%.... you'll want that as close as you can manage for balance purposes. When I was doing pedestrian stuff (not high performance) the target was .5g weight match on both ends with total imbalance < .5oz/in. On race car stuff I'd like to see .25oz/in, which usually meant getting parts < .3g from one another.... and that was on bobweights that were at least 3 times as heavy as what you're working with there. The uber-short stroke on these motors helps a bit, but I'm a stickler for details.
With that said, I would be more interested in how round and close to spec the big holes are when torqued to spec... did you measure that by any chance?
Attack life... it's going to kill you anyway.
Last edited by SpazOnaZX; 05-30-2017 at 06:04 PM.