Have a 2006 Merc 50 HP 2-stroke that came with a used Tracker PT165 that I bought last fall. The motor ran rough from day 1. I thought I figured out my problem when I found that the inside lining of the hose was disintegrating. I replaced the fuel line with automotive fuel hose, re-built the fuel pump, and replaced the fuel filter. All along this path, I found pieces of the old fuel hose lining. While the motor does run better, it still doesn’t seem like it runs right to me. It runs the roughest when I trim the motor up at idle. The more I trim it up, the rougher it runs and dies most of the time when I trim it way up as I approach a boat launch. I’m thinking I may rebuild the carbs next. Thoughts? Could pieces of the old fuel hose lining be in the carbs even though they are on the other side of the filter? Why does it run the roughest when trimmed up?
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