Took boat out over the weekend and immediately noticed it sounded different. Not the usual loud rumble of a two stroke. Could only get about 4000rpms at WOT. Changed the plugs. no improvement. When I pulled all the plugs to inspect I noticed the whole left (port) side bank was not firing.
not sure if I should replace the power pack or ignition coils (both?)
is there a way to test for either one?
my 2001 did that and it was the power pack i came in on 3 cylinders but about 2000 rpms . if i remember corect its under the flywheel.
210CCSEAPRO 225merc.
simiretired
15’ High Tide
50hp RUDE
I did some extensive research (Google) as to why the port side cylinders are not firing. There appears to be a neutral shift switch that cuts power to that side in order to make for softer shifting from nuetral to forward or reverse. Will check it out and post follow up.
I had the same problem on an 87 merc and it was the power pack. You can switch the two power packs and see if the problem changes sides. Change the rectifier too.
Put the muffs on the engine and cranked up. Same low rumble signifying continued problem with the port side cylinders. I removed the neutral shift switch and depressed and pulled the plunger, engine immediateley increase rpm’s and was affected by my activation of the switch (appears to stick and not release). Order placed for replacement. I will post follow up once I retest. I hope this resolves my issue.
I had the exact same problem and I simply removed mine. Mine was hit and miss whenever it decided to knock out 3 cylinders. The only thing it’s for is for that split second when you shift so you don’t slam into gear and tear up vyour lower unit. I have no problem with my motor idling low so it’s not a big deal. If your motor doesn’t idle down then you’d end up tearing up your lower unit. I’ve had no problems since I removed it.
Being superstitious is bad luck.