1995 Sea Rayder - Mercury Sport Jet 90 - High Idle

[sojournertruth]

I have an inherited 1995 Sea Rayder that has the Mercury Sport Jet 90 in it. It starts right up but the idle speed is excessively high. I have checked and cleaned the carbs, checked the vacuum fuel pump for any tears in diaphragm and made sure the linkage, and throttle assemblies aren't jamming (Although I could be missing something in that department). What are some things to troubleshoot and check? I am new to jet drives and inboard boat engines. I will attach pictures to the thread tomorrow.

 

[tdonoughue]

Not familiar with that boat. What engine is in it? 2 cycle or 4 cycle?

May be obvious, but this would be an engine problem (rather than a jet or fuel issue). At that age, many jets had 2 cycle engines. I know you said you cleaned the carbs--did you take them out and do them all, or did you just spray them down while on? Many issues with 2 cycles are the carbs not being cleaned (or, to the contrary, people adjusting them instead of cleaning them--then when they clean them the adjustments are off).

 

[Cobra Jet Steering LLC]

it is 2 cycle and those had a ton of different issues it is a force 3 cylinder 90 hp outboard power head converted to a jet pump