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Johnson 200

I have a Johnson 200 on a sv2100 sea pro.The compression is good on all cylinders. It does not have a jack plate and not sure of prop size but only getting about 4500 rpms out of it. What you guys think. Prop issue?? Thanks!
maybe old fuel, ethanol fuel with water in bottom of tank, some type of fuel blockage, engine not getting enuf fuel, air leak in fuel hose or bulb, pickup tube partly blocked in tank, collapsed hose, spark plugs, possibly fuel pump, carbs and etc! start with the easy and work your way to the uneasy!!!GOOD LUCK!!! PLEASE LET US KNOW WHAT THE PROBLEM WAS!! is it a 2 or 4 stroke?

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