🔧 MerCruiser Thunderbolt Distributor Ignition Sensor Kit - 87-91019A3 Replacement | 4.3L, 5.0L, 5.7L, 7.4L, 8.2L Engine - Upgrade: 87-91019A2, 87-91019A6, 87-892150Q02, 87-861780Q4 - Ignition Pickups Review

Both errors within the first 2 hours. End up costing thousands at sea. I should have known better by not trying products with no way out.

mounting holes for screws do not match. You will need to enlarge the holes in the manifold and remove the insulation from the module to fit.

After what felt like an eternity in the middle of boating season. I was at the limit of my abilities examining an old hand grenade in the hatch. Until I came across it. I was skeptical because nothing else worked to get the spark needed to run the old 350. Well for $40 this little one gave me what I was looking for. All of this was connected and, kablaammm, a 35 year old outboard motor was brought back to life! That day was the happiest day of my life. No problems after 15 more uses! Highly…

I bought this as a backup in case one of the motors failed (it happened twice in 21 years). So I wanted to test it and see how it works but the holes in the manifold didn't match. so i return But after filling I can see where there is a thicker foam gasket around the rim on this unit that needs to be compressed more than it can allow, maybe the problem. My old one has a thin seal. So if you buy this and can't line up the holes, take a sharp knife and cut the gasket in half the width.

Easy installation and solution to two annoying problems. Removing the old sensor required sanding the plastic case. Fixed starting problem, no start on my vintage 1985 cruisers. Baron Restoration Project 222. I also couldn't get the engine to run at half speed without stalling. Mercruiser 305 GM Crusader, 230 hp. At the same time I refreshed the coil, cover, rotor, wires and candles. The starter drew too much current and dropped the voltage below the 9 volts needed to signal the Thunderbolt…

50%. So far this has been my measure of success. I bought two of these to replace my old devices. I thought companies like Seirra and even Quicksilver would contract for these devices. There are only a few companies that manufacture them. The only difference is the name on the packaging. But for now I think I'm wrong. Of the two I bought, only ONE works! I just spent 8 hours troubleshooting why I had no spark on one engine, but my other engine was working fine. Finally. I put a worn, rusty, old