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Thread: 300 pm ecu
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03-22-2018, 03:57 PM #1Member
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300 pm ecu
2002 Stratos 20XL w/ 1998 Mercury 225 EFI
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03-29-2018, 05:11 PM #26000 RPM
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Mine run around 6350 bolted to my 250xb, the 250xb ecu turned 6150
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03-29-2018, 05:35 PM #3Member
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03-30-2018, 07:03 AM #4Member
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Both ECMS have to have raised limiters. If you try to use a 300PM ignition and a 225 Fuel ECM, it will flood the motor with fuel. Either use a 250XB or have a 225 fuel ECM programmed.
"We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, we are now qualified to do anything with nothing."
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Capt.Insane-o liked this post
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03-30-2018, 03:56 PM #5Member
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03-30-2018, 05:55 PM #66000 RPM
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Last edited by Varmint; 03-30-2018 at 06:01 PM.
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03-30-2018, 09:46 PM #7
early 300 promax motors had a 5800 or 5900 limiter...i remember one of mine would hit a wall at 5800ish so i just kept throwin bigger wheels at it until it stopped hitting the limiter....i have a raised limiter on my 300pm thats on my kryptonite but i dont remember how high we raised it...
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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03-31-2018, 07:36 AM #86000 RPM
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I just cleaned up the clamp on my 300 for paint,I will get you the serial number,,then you know what s/n range to be looking in
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03-31-2018, 03:08 PM #9Member
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ghost28 liked this post
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03-31-2018, 06:43 PM #106000 RPM
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03-31-2018, 06:44 PM #116000 RPM
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03-31-2018, 07:44 PM #12Member
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04-01-2018, 07:39 AM #136000 RPM
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04-01-2018, 07:40 AM #146000 RPM
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no,the 300 box and both 250xb boxes are stock,never touched
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04-01-2018, 07:46 AM #15
Hey xringmaster are you boating now as in this time of year??? I could prob send you my ecu and u could try it out n ship it back...itbwill cost you shipping both ways but at least you ould know if its your ECU or not....
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)