Yep, we finally finished the build. We had to get creative with a couple of things like the steering blocks which we deviated from the plans a tiny bit.
The other issue was dealing with the chain. After some testing we determined we needed a tensioner to take up some of the slack because it was popping off when going off road.
We built a tensioner with some scrap delrin I had lying around and another "steering" block we had an extra of. The steering block is actually a bracket for hydraulic lines with a tapped metal plate to which 2 split green blocks of plastic hold a 1/2" tube then a plate on top. We welded the tapped plate to the bottom of the frame where the chain crosses under then drilled a couple of holes in the delrin and bolted that to the plate. This way it's replaceable when/if it wears down.
Once the chain dug a bit into the delrin the slack seems to be gone and things are working better.
We'll see how this tensioner holds up over time and if we need we'll some up with a spring loaded one with an idler. I was going to go with the idler idea but finding a 41 chain idler with a bearing is really tough around around here...
Go Kart first run:
http://www.youtube.com/watch?v=4WYDc63lbyg
More testing (Mike's daughter showing off):
http://www.youtube.com/watch?v=uld1bIHa9iw
