1993 Evinrude Crossflow 115 runs rough

[chopperguy]

Ok, When I checked the timing at idle with the embossed mark aligned with the cam follower, The timing was well below 4 deg BTDC. As a matter of fact it was below the TDC mark. I don't think this is a good thing when a spark occurs after TDC. Could this cause popping through exhaust at idle? When I advance the timing at the arm leading to timer base unit the popping stops. Not sure if this is correct, but the thing is running much better.

 

[racerone]

At idle the throttle plates are closed.--RPM is controlled by retarding the timing.---The more retarded it is the better !

 

[chopperguy]

I know it's been a whilebut here's an update. Finally got out to check max advance. 28 Deg as near as I could tell. Boat is running great, no popping, good acceleration and idle is steady. Thanks for all the input.

 

[jimmbo]

So what was changed that stopped the popping?