In looking over everything, I came to find I have a bent axle. New one on the way, and I’m not even going to open up the can 'o worms about stiff vs. soft… It has a medium in it, and that’s what’s going back in.
I did notice that the chain tension is variable depending on where the axle is rotated. I suspect this is due to the bend, but after fooling with the two piece rear sprocket a bit to try to dial that out, I got to thinking- how critical is it to get the two halves exactly the same distance from each other on both sides? Using a digital caliper, I was able to get them within 0.02mm of each other.
I also noticed the outer races of the two engine side axle bearings could move around a small bit in their carriers. I presume this allows the axle to float a bit in relation to chassis flex, but want to address it if it’s not ok. *edit- I did notice that the middle bearing doesn’t have any grub screws holding it to the axle. Is this what’s meant by running it loose?
Finally, I read on some UK karting board that Tony Kart frames have a tendency to crack under the engine mounts if the tensioner bolt is left tight against the mount. Thoughts? How tight is enough if it’s supposed to be touching the mount?
And as an after thought- are there any books or websites that cover general maintenance stuff like what I’m asking here? I don’t mind asking, but I feel like this is pretty basic kart wrenching stuff that should be covered somewhere.