Flywheel Magnets Unstuck again- Dhadley?

[Beacham]

1987 Evinrude 225. Runs GREAT.

I posted here two years ago to ask for advice on how to glue in a new set of flywheel magnets during a complete rebuild of the ignition system. The existing flywheel magnets were all unstuck and bunched up when I got this motor and I needed to know the orientation for a new set.

I got EXCELLENT good advice on this and many things since. Just noticed today after a weekend of running that one of the flywheel magnets has come unstuck. Whats going on? I scoured the inside of the flywheel last time around, when I replaced all of the magnets using the glue in the kit provided, and thought that this was solved for a lifetime. Since I'm about to pull the flywheel and do it again, what do I do to avoid this again? A couple questions:

1) Should I remove/replace all of the magnets?
2) Could this be due to the WD40 spraydown that I give my motor before (and sometimes after) each ocean run?

DHADLEY, since you are my hero and always have answers about this motor, have you been here before? Where did I go wrong?

One last thing; with the help of this forum and lots of parts/labor/busted knuckles (all my own) I have gone from 3200 max RPM to 5200 over the 2 year lifetime of this boat in my hands, with top speed of 40 mph on my 22 foot ChrisCraft Seahawk 216. Any suggestions for squeezing out another 300-400 RPM? Fuel and ignition are all new or rebuilt. What steps can I take to tune?

 

[Dhadley]

Re: Flywheel Magnets Unstuck again- Dhadley?

We don't put a whole lot of trust in the glue that comes with the magnet. We use the typical "A B" 2 part epoxy. The other thing is to clean the flywheel. We glass bead the sealing surface. Or sand it completely.

At this point I'd say that any magnet you can get loose, go ahead and do it. If the magnet is still stuck, then it's OK. Clean the surface real good and reglue any magnet that is loose.

 

[Beacham]

Re: Flywheel Magnets Unstuck (Again)

Re: Flywheel Magnets Unstuck (Again)

Thanks a million-

I know that you guys tend to avoid brand specific recommendations, but would you go with something like JB Weld, or some other 2 part product? Should it be marine-specific?

Unrelated, but, can you refer me to a thread in this forum that deals with tuning the top end, or is 5200 RPM all I can expect out of my motor?

Seems like I hear the number 5500 a lot.

 

[Dhadley]

Re: Flywheel Magnets Unstuck (Again)

Re: Flywheel Magnets Unstuck (Again)

JB Weld will work. We use a generic 2 part epoxy. Can't think of the name but it's very common. Any 2 part epoxy will work.

You should be looking for at least 5600 or more on that motor. Now that it's running good, just work with the set up to gain as much efficiency as possible.

 

[Beacham]

Re: Flywheel Magnets Unstuck again- Dhadley?

Roger wilco