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Outboard Technical Discussion This is our outboard engine related technical discussion forum. Topics include engine repair and maintenance, modifications, gearcases, electrical and electronics, etc. For technical assistance related to topics not outboard related please use our other Engine forum.

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Old 09-21-2017, 09:03 PM   #1
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Default Reflashing a Verado

Okay...I know there is misinformation out there regarding reflashing the Verados, so let's see if we can set the record as straight as we can for everyone who might be considering this.

I am considering getting a boat with a 200 Pro Verado on the back. I've talked to a lot of folks and researched many, many boards about reflashing the 200 up to a 300 at Eric Simon's shop. To my knowledge, the 2 motors are identical bolt for bolt above the gear case, except the ECU. The gear cases only differ in ratio as the 300 is a 1.75:1 and the 200 is a 1.84:1.

Every once and in while a new factoid will pop up that I haven't encountered before so I'll do my best to verify if I can. So, with that in mind, the most recent one I encountered was that the pistons in the 200 are not the same as the 300. However, I don't think that's correct but I'm not certain either. I've looked up pistons for each motor and the part numbers are coming back identical. However, what I don't know is if the pistons corresponding to this part numbers are somehow different from OEM pistons.

200 Pro Piston Part Numbers: https://www.perfprotech.com/mercury-...150?model=1427

300 Pro Piston Part Numbers: https://www.perfprotech.com/mercury-...150?model=1429

Jupiter Pulsare raised another one with a windage tray for oil. I have to confess I don't know what that is. I'm hoping he can help me understand and have asked him to jump in here.

The other thing I'm not sure about is that there are differences in same model engines from older engines to new engines after a certain serial number, but I don't know what changed in the engine to cause them to differentiate at the designated serial number.

I'll ask John Lamon to jump in here too as he's a Mercury tech.
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Old 09-21-2017, 09:12 PM   #2
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Interesting, but think there's a lot more difference. Just can be that easy to gain 100hp.
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Old 09-21-2017, 09:28 PM   #3
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Quote:
Originally Posted by PA-Cougar View Post
Interesting, but think there's a lot more difference. Just can be that easy to gain 100hp.
I think it is, but it costs your warranty to find out.
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Old 09-22-2017, 01:34 AM   #4
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Model Owned: 89 Eluder w/220 merc EFI, 76 V-mate 1

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I can tell you that when I order a power head for and 200 to 300 pro verado it says right on it 200/250/300 Pro verado, other than that I'm not supposed to say much, lol.

They have been talking about sometime in the near future the possibility of sending the motors to us as blanks and we program them for whatever the customer buys, the 200/250/300 pro verado, the 75/90/115 and the 200/250 optimax. Easier for dealers to stock a variety that way, we just set it up and put the appropriate hp decals on and done, I'm not sure if it will actually happen, but there's been talk of it.
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Old 09-22-2017, 08:38 AM   #5
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I would think that the cost to make either the 200, 250, or the 300 would be virtually the same in labor and parts. So that is probable that it could be simply a reprogram. Likely the 200 and 250 engines are de-tuned 300s. This also assumes that the engineers were able to design (size) the fuel / air, and exhaust systems to work for all three.

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Old 09-22-2017, 09:39 AM   #6
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If that is true then the pricing is criminal. Over $4000 upcharge to a 300. http://jacosmarine.com/mercury-engine-pricing/
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Old 09-22-2017, 09:50 AM   #7
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If that is true then the pricing is criminal. Over $4000 upcharge to a 300. http://jacosmarine.com/mercury-engine-pricing/
It's true, every part number but the ECU is the same, I want to try a 250 ECU on my motor and see what happens, but yeah warranty would be gone if something happened.
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Old 09-22-2017, 10:13 AM   #8
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Go big or go home... throw the 300 ecu in!
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Old 09-22-2017, 01:39 PM   #9
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Can I reflash my 300 to a 400R?
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Old 09-22-2017, 02:31 PM   #10
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https://whipplesuperchargers.com/ind...ategory_id=186
I talked with someone who had thier 200 flashed to 325, said on 90 oct its got an unbelievable amount of power, and he would do it again without hesitation. I think all the 6 cyl models can be flashed to 300 plus. My 4 cyl model is only able to be flashed up to 225, but after my warranty is up, im doing it
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