How Big of a Deal Swapping Out Power on a 25 OB?
#1
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I've had my eye on a 25 PP OB that was originally rigged with 2 X 225ProMax's EFI's. Would prefer an Opti powered boat and Mercury only offers the Racing Division Optimax 250XS's with 20" mids and counter-rotation.
I'm assuming the 225 powerheads were not as wide as an Opti 250XS powerhead and also that these two different engines have differently spaced bolt patterns with the Optis being mounted a few inches wider to allow full steering.
How big of a deal is it to plug the original mounting holes in the transom and rehang the new Opti's?
Any feedback is greatly appreciated. Thanks!
I'm assuming the 225 powerheads were not as wide as an Opti 250XS powerhead and also that these two different engines have differently spaced bolt patterns with the Optis being mounted a few inches wider to allow full steering.
How big of a deal is it to plug the original mounting holes in the transom and rehang the new Opti's?
Any feedback is greatly appreciated. Thanks!
Last edited by Ing; 12-03-2012 at 07:16 PM. Reason: spelling
#2
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I've had my eye on a 25 PP OB that was originally rigged with 2 X 225ProMax's EFI's. Would prefer an Opti powered boat and Mercury only offers the Racing Division Optimax 250XS's with 20" mids and counter-rotation.
I'm assuming the 225 powerheads were not as wide as an Opti 250XS powerhead and also that these two different engines have differently spaced bolt patterns with the Optis being mounted a few inches wider to allow full steering.
How big of a deal is it to plug the original mounting holes in the transom and rehang the new Opti's?
Any feedback is greatly appreciated. Thanks!
I'm assuming the 225 powerheads were not as wide as an Opti 250XS powerhead and also that these two different engines have differently spaced bolt patterns with the Optis being mounted a few inches wider to allow full steering.
How big of a deal is it to plug the original mounting holes in the transom and rehang the new Opti's?
Any feedback is greatly appreciated. Thanks!
Most of the 25' PP's I've seen have the motors mounted to the transom so that'll make it easy. Pull the motors and glass in 1/2" dowel rod in the existing holes and re-drill.
Good thing is, I believe that will be a direct bolt up conversion. Control cables and harnesses should mate right up.
Glad to help if I can. pm me for my # if you have questions.
Gary
#5
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Not sure about the opti's due to smartcraft, but any other 3 litre merc will go in the same holes, and have the same wiring as the promax's. Not sure if the powerheads are bigger or not, but since center to center is not changing, I dont think it would be that big of an issue.
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The promax to optimax motors will bolt right on the transom with no problem but u will have to buy an adapter for the boat harness since the plug in from the boat harness to the engine harness are different. If u dont want to buy the adapter u can buy new harnesses for the boat but the adapters are less expensive.
#8
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The promax to optimax motors will bolt right on the transom with no problem but u will have to buy an adapter for the boat harness since the plug in from the boat harness to the engine harness are different. If u dont want to buy the adapter u can buy new harnesses for the boat but the adapters are less expensive.
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The boat was originally rigged with older ProMax 225's that required 91 octane, I was thinking that Optis were the way to go with this installation. The adapter vs. new harnesses info is very helpful. Thanks
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