Problems? Everything- the Chrysler switch to Force is correct. I had a Force 120 horse and it had lots of problems. The ones that I hear have the least are the 75 and 85 horse. On the 120 horse and 150 horse ( the 150 is a 120 with an unbalanced added cylinder globbed onto the crank) balance is terrible, they are crap. I bought my Trophy with it. (against all of my friends advise, but thought how bad could it be) I had trouble from day one. I continually put money into it. I was going to change it out with a Merc and nursed it along for several years. If you troll one the rings will stick into the piston ring lands, which you shouldn't do with any big older outboard two stroke. So it will drop compression in cylinders easily. Lets see, wish I would have kept the receipts for this motor to discourage you, I had the stator go out on the top and take out all of the magnets on the flywheel. So had to buy both. Had a crappy starter. Alternator only put out 7-9amps so fishing two days in a row with electric downriggers was out unless taking it home to recharge the batteries. I fish Neah Bay often and would never, ever, go past Tatoosh Island (where the straight becomes the ocean) with this motor.) Make sure you have a good trolling motor as I had a 20 horse and used it to come in on the Puget Sound more times than I care to remember. When the newer Forces said by Mercury on it they were a little better and used some newer electronics and better Merc parts. But I think they did this to finish getting rid of the rest of the remaining motors, then discontinued them. The last go round I spent $800 keeping it running so I could get rid of it. That’s when it blew a cylinder. So it was worthless to get rid of. I now have a 150 Merc and have gone out as far as 40 miles past Tatoosh into Canada halibut fishing. One of the best days of my life when the Force blew. No more throwing money into a hole.