We're very disappointed with the new Lego 10303 Loop Coaster. After looking forward to getting our hands on it for months, we realised very soon after building it that it has a serious flaw. The counter balance keeps hitting the top pully mechanism, effectively breaking the structure apart each time it returns to the top. The carriage also hits the bottom of the set quite hard causing it to bounce very violently.
We've tried to fix the issue and believe we've succeeded so this video shows what we've done to solve the problem. The fix included making the counterweight heavier and removing one chain link.
Also, remember not to run your motor at full speed!
