i have yamaha 1992 yamaha 200 outboard,no problem cranking up and run everytime,and it will run about 4500 rpm,i never try go over 4500 rpm,it dont feel like loosing power at all,but i unplug ignition core one at the time number 4 cylinder dont change running,is that sounds like i am running 5 cylinder of my motor?and swap core and plug and test ,core and plug are good,compression,1-3-5 110,2-4-6 115,use spark plug tester all 6 have orange color spark,i will check any gas go to that #4 cylinder next,if have gas go to it,what i need to check next,stator?cd?thanks.