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10-25-2016, 01:19 AM #1
5000 RPM
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Is a 2002 Mercury 250efi Powerhead the same as optimax?
Just wondering if the Powerheads are the same? Basically looking at buying a Powerhead I blew my 2002 Mercury 250 efi. I've seen a lot of optimax Powerheads for sale. As long as the compression checks out are the optimax the same as in can i put on my electrical accessories etc and be the same as the efi or no? Thanks for any help.
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10-25-2016, 08:56 AM #2
AKA Eroshibend Yamamoto
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They are different,pistons some bosses and bleed system,not worth the time to convert jmo
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10-25-2016, 10:18 PM #3
6000 RPM
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Why not rebuild yours?
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10-26-2016, 09:07 AM #4
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Thats the plan i was just exploring ideas. I've been having a hard time finding someone that rebuilds outboard crankshafts. I just need one journal repaired does anyone know of anybody in Florida? I was told somebody in Miami does it but nobody I have talked to has a name or phone number.
Originally Posted by Todd D
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10-26-2016, 09:12 AM #5
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#1 piston rod cap bolts broke in half looked like from lack of lubrication. On number 6 here is a picture the piston. Does anyone know what causes this? Overheating? On the other side of the end cap there is nothing it looks good.
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10-26-2016, 01:37 PM #6
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Don't rebuild that crank just find a used one. The repairs always fail. A used crank for that should run $500-$600. They are pretty easy to find. Repairing one cost about the same....
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03-09-2017, 01:36 AM #7
Screaming And Flying!
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IF ITS A DOWN DRAFT MOTOR then YES you will have to swap the bleed valves from 1 to other but yes the DOWN DRAFT EFI motors are same as opti blocks the LASER BACK DRAFT Nippondenso electronics block is DIFFERENT
4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she
things that were are no longer as they are today...
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03-09-2017, 07:12 AM #8
Supporting Vendor
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. Port timing is totally different, as well as the pistons. Op should just get a used crank and fix what he's got. I just picked up a used crank yesterday for 300$ Originally Posted by 150aintenuff
action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build
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03-18-2017, 06:42 PM #9
Screaming And Flying!
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I have a 250 opti block and a 250 down draft efi block ports are identical save for the oil drain back in the sleeve on the opti block which are below the rings an uneffect the actual running compression area pistons yes different for the fuel system but BLOCKS themselves are same
4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she
things that were are no longer as they are today...
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03-18-2017, 07:34 PM #10
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He rebuilt his power head and everything is good
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03-19-2017, 09:12 AM #11
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Thanks to Todd d I rebuilt the motor a few months ago and all is good. Couldn't have done it without him.
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