We put the left side battery tray back in, and found the second commonly known problem with the Caster EX1.5R. On some motors (the Tekin T8 included) the shaft protrudes too far, and hits the battery tray. Now, some people cut their motor shafts to make it not hit. I wasn’t comfortable hacking on a brand new motor.

Instead, I drilled new holes in the battery tray, about 3/16′ forward of the stock holes. This allowed me to slide the battery tray back as far as possible. It now hits the rear shocktower (no moving parts though).

There is now about 1/16″ of air between the motor shaft and the battery tray. Not a lot at all. We’ll keep our eyes on this spot as we start running the buggy. We’ll watch for signs of the motor shaft hitting the battery try and address it as soon as we see it (if we see it).