mixgashaulbass My Ride Posted November 25, 2018 Hey, doing a top end on a 2003 400ex. Getting a new cylinder and all. On all the 2 strokes I've rebuilt I've oiled the cylinder but I was reading on a 4 stroke page that most people assembly the top end dry to ensure that the rings seat. Which method should I use? Wet or dry? Also, how should I break it in? Thanks in advance Share this post Link to post Share on other sites
shrubitup Posted November 25, 2018 split the difference. Lube one side of the piston and then other other side of the cylinder wall. 🙂 I assemble a two stroke dry except for the wrist pin bearing. 2 Share this post Link to post Share on other sites
Joey Obrien Posted November 26, 2018 No always do it wet. Dry can cause premature wear 1 Share this post Link to post Share on other sites
