2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 208Get this manual
Running motors too fast (Overspeeding)
"Too fast" means running faster than motor normally runs on boatRunning too fast can happen when1) Using flushing device Turn on water before starting motor to keep motor speed below 2000 RPMWith no load, motor will run too fast very easilyWear eye protectors
2) Running with the wrong test wheeL This may happen if motor runs too fast
Use the right test wheel
Running motors: Exhaust fumes
Exhaust gases of running motors contain carbon monoxideYou cannot see it; you cannot smell it; you cannot taste it, but it is there whenever motor is runn ingand it is deadly! When you smell the other gases in the exhaust, you are inhaling carbon monoxideRun motors only in well ventilated areasEyes need protection when: