2002 merc 225 smart craft rev limiter

[gugug]

Does any one know why my smart craft rev limiter kicks in at 5750 RPMS? For a 225 bthis seems low. What are the max rpms for a 2oo2 mer 225 efi? How do i reprogram or adjust the limiter ? Thanks-d

 

[bret walters]

Re: 2002 merc 225 smart craft rev limiter

that is the max rpm that the mercury engineers have decided is safe for this engine. the rpm limiter is not adjustable. just curious why the need for more rpms?

 

[gugug]

Re: 2002 merc 225 smart craft rev limiter

I am not dissatisfied with the performance, merctech, the motor reaches the rev limiter very easily, pushes my basscat cougar about 73-75mph, seems like it would go considerably faster with a couple thousand more rpms. Also I had a 94 merc xri 175 horse that would wind up to about 6000 rpms, so why the low limit on the newer model , doesnt merc have confidence in thier product?

 

[bret walters]

Re: 2002 merc 225 smart craft rev limiter

yes mercury has confidance in there engine. this engine is a larger displacement engine and make more horsepower and torque in a lower power band. it is done making power by 5750. if you are hitting the rpm limiter you are under proped. try a larger pitch prop of the same design, you should see a decrease in rpms of aprox. 200-300 per inch of pitch increase. engine rpms do not make a boat faster, the amount of water that the prop moves is what propels the boat. more horse-power means a larger prop can move more water at the same prop shaft speed as a smaller engine turning a smaller prop at the same prop shaft speed.

 

[gugug]

Re: 2002 merc 225 smart craft rev limiter

I mean no disrespect, but wouldnt turning the prop I have now a couple thousand times more a minute displace more water thus making my boat faster as well? I agree that the boat is under propped maybe a 27 pitch would help. I talked to a few marina owners that say that 2002 merc efi max rpms are 6100, and that merc sets the limiter to reduce warranty claims and emissions? Again I am no mechanic (I think this is obvious) and I appreciate your help merctech.-Gug

 

[Dhadley]

Re: 2002 merc 225 smart craft rev limiter

Do you have an EFI or an Opti Max?<br /><br />Let us know!