Believe it or not, that vintage of Force engines are pretty durable if you do the basics:
- Keep fresh 50:1 fuel in them, preferably with a little Seafoam mixed in
- Clean the carbs if you ever notice idling issues
- Keep a good impeller in them, so you don't overheat them.
What mostly happened with the earlier ones is that they sold a million of them at Costcos and Sams and in malls to people who had NO idea of how to run or even gas/oil a boat with a 2-stroke engine. Many of them detonated because people put 10W30 or NO oil in them. So they got a bad reputation.
The 70 HP were bombs. Every one of them blows the center cylinder. But the 85, 90, 120 and 150 HP engines were actually solid engines. Many of them are still in service and many others are still serviceable, but the boat has rotted from around them like the Spectrum above.
I've run a couple of them for years with excellent service. I've never blown one up. Here is a story about one I ran the longest on my Chesapeake Bay center console
Back around 2009 I sold my Aquasport 170 center console with a 90 Force to a friend who was moving to the coast, but he HATED Force engines and he complained loudly about it.
I told him it was a great motor and that he should run the boat as-is for a little while before swapping it out. He scoffed, but he ran it after they moved. Later, he called me and said he was shocked at how smooth and powerful it was. But he was going to change it out, "for safety reasons."
A year later, we spoke again, and he hadn't gotten around to it because it ran so well, "But that Force was GONE" when he got time...
Fast forward to @2019, a good decade later. We saw each other online and chatted for a bit. Of course, I asked about the boat. He said it was still great, and NO... he never swapped engines. He gave the boat to his two sons, and they run it almost every day. He then laughed and said he can't believe that JUNK Force has outlasted several other engines he's had since then, and is still going strong! I smiled, but resisted the urge to tell him I told him so.
True story!