boat motor tune up..

[Dirty42]

Sounds good. Even if the adjustment screws seem to be in the same position, it won't always sync them up. Pull the spark plugs (also number where they came from to identify specific cylinders that may have issues) and get a good read on them. There's a few charts online that you can use to help diagnose any rich/lean conditions. Check your fuel supply before you go out too. Most of your issues could be due to something simple like a filter or kinked hose.
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