ORIGINAL: w8ye

This first part of this post is for new people that may be reading this?

The gap in the ring must not go through a port area.

I'm sure you have already been there but the ring must be pinned to keep the gap between port areas
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If your catching or clicking point moved, it may very well be a bearing? I rebuild a lot of glow engines and old bearings are frustrating in that you will think you have them cleaned out and that they will be fine and the next time you pick the engine up, there is a rough place in a bearing.