Anyone have a rotor do this before?

[JL8Jeff]

Here's the new MSD rotor in the 350 in my speed skiff. This was after running it 3 times. The middle time was a good 1-1/2 to 2 hour day on the water. It completey burned and charred the plastic. I'm not sure if it's salt water related or just a defective rotor that was spraying spark. The engine was still running strong too!

[crainholio]

HEI or points? What cap, coil, and (if HEI) ignition module are you running?

I stick with Delco stuff for the cap/rotor and ignition module, aftermarket stuff hasn't been reliable for me in marine applications.

[sweetbmxrider]

Send that to msd, I bet they send you a new one.

[WildBillyT]

MSD will probably replace it.

Hate to say it but their dizzys are quickly getting a rep for being of poor quality. Just as a matter of completeness make sure you check underneath the cap every little while for rust buildup.

[JL8Jeff]

I'm wondering if the rotor wasn't screwed down all the way or sitting level. Or if the constant bouncing on the water was making the cap bounce around. I put the old rotor back on and no signs of that so far, but I've only run the boat on the river which is nice and smooth. I plan on getting a cap that screws down to the distirbutor instead of using the stock style spring loaded setup. A car doesn't bounce around like a boat does so I could see that being an issue on a longer run like I did.