u didnt break the second truck in ???

your truck is sticking at the top of its stroke it is a tight fit with the piston and sleeve that is why it is getting stuck spray a little wd-40 in the piston chamber let sit for 30 mins with the piston at the bottom of its stroke and try it again

always store your truck with the piston at bottom of stroke so that when it cools the sleeve will tighten up again and keep high compression in the engine