mercury pro 250 XS

[206 Champ]

I bought,or, at least thought I bought, a remanufactured 250xs from what is supposed to be a reputable business. What I ended up with was a 225 proxs with the ECM flashed to a 250 and 250 stickers on the cowl. What I find out is that the heads and block are different and just by flashing the ECM it does not make it a 250. The most I can get out of her is 5300rpms. My mechanic recommends that I reflash the ECM back to a 225. Reason being is that the 250 ECM is putting to much fuel n the motor and basically choking it out. Is this possible? Will reflashing the ECM fix the problem? I don't want to spend 700 on reflashing the ECM and not have it work. The other altenative is to have the heads and block redone to a 250 which will cost 2200. I don't want to spend that amount on the motor. There is no legal recourse. Its out of state and no attorney wants to touch it. Any suggestions? Thanks

[JOE54]

first youll find more info on your engine in 3.0L section but you may can find a used pcm in for sale section too/but see if you can find someone that will let you run a pcm for a 225 pxs make sure it has same ignition [coils] and throttle cam see how it runs then youll get an idea of what to do/id choke somebody people like that need to be tarred and feathered

[EuropeanAM]

+1 on the Tarred/Feathered!

Drop over to the 3L forum, and start a post there. Be sure to include some pictures and the engine Serial Number for assistance.