just treied to start my sons xp and it is real hard to pull, rope broke while trying to get it to start first time, so just to check a thought i pulled the glow plug and turned flywheel by hand,wnt ok till piston got to top dead position it stopped and was extremely hard to move and while flywheel was still turning piston didnt move but could hear what sounded like the rod slipping on the crank.....could the rod be too long or is this normal and the motors are junk..... by the way car is brand new and hasnt even run yet....... have turned over my duratrax and associated and losi lst by hand and they are much freer