Cylinder Power Balance Test 90HP 3Cyl

[WildWillJAX]

Can someone tell me what rpm loss and running characteristic that I should experience when performing a cylinder power balance test on my 90hp 1989 3 cylinder Merc.<br />With the engine idling at 900 rpm,s in nuetral.<br />It is my understanding that when I disconnect and ground out spark plug leads one at a time, I should see an equal loss of power(rpm's) for each cylinder and that this observation is an indication that each cylinder is contributing an equal ammount of power.<br />Am I wrong? Will the loss of one cylinder affect rpm's and running condition more than the other/s?<br />Someone stated that the cross looping system on these engines is such, that a cylinder power balance test performed as described is not valid.<br />What is your take?<br />Still troubleshooting my engine power loss/rough runner at plane speed (3000 rpm's under load).<br />Thanks<br />Will