After much research, I'm pretty sure the trigger on my Mercury I6 115hp is bad.  It is my understanding that I will have to readjust the timing after replacing it.  Is this difficult to do?  I'm fairly handy but without a lot of experience.  I know I'll have to purchase a timing light.

I think that motor has two trigger modules.  

I think it also has a high and low speed coils in the stator that can make it act like a trigger module is bad.  

Don't know about having to reset the timing when you replace a trigger module, if so, that needs to be done on a dino because it has to be done at wide open throttle (WOT).

If a dino is not handy, you can do it by backing the boat into the water until the anticav plate is a couple inches about the water, leaving it tied down on the trailer.  Then watch the tach as you make a quick full throttle run of the motor, if the RPM is below 5200, pull the boat a little further out of the water, if it's above 5800, back the boat a little deeper in the water.  Only hold it for a few seconds doing this.  Once you get it where the rpm is in the 5500 range, get you timing light setup and have someone go WOT, again only for a few seconds while you read the timing with the light.   MaKe any adjustment needed and repeat.   

If you have an old prop, it would be a good idea to put it on.  It will be sucking all kinds of crap up off the bottom, even rocks off a concrete ramp.  Also, make sure no boats are within 50 feet of the back, you will probably throwing a very healthy rooster tail out the back.

 

One word of advise, anything I tell you about a Mercury motor, verify it by double checking with someone that knows what they are doing with them, I don't.

I believe tne CDI  power pack for inline 6 Merc timing is fixed, no adjusting needed.

Tom

1 hour ago, WRB said:

I believe tne CDI  power pack for inline 6 Merc timing is fixed, no adjusting needed.

That would be nice.