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Thread: Super nice 225 Promax
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02-12-2019, 12:53 PM #1
SOLD. Super nice 225 Promax
Mercury Racing 225 Promax with essentially a new powerhead. Engine was built with a new factory block, piston kits (WSM with 1.5mm rings), steel cage rod bearings, all new electrical components (regulators, stator, trigger & switch boxes). A32 ECU that was just serviced at Simon motorsports w/ a year warranty. New TDR reeds, injectors cleaned & flowed. All new cooling components - poppet valve, thermostats & waterpump. The engine has about 15 hours on it for break-in, testing and tuning. Factory Promax midsection, Alien Style Factory light weight cowls. Ratcheting 1.87 lower unit with welded Bobs cone lower water pickup and torque tab on skeg. Probably forgetting a bunch. The motor looks new and run great. A Promax I built that is identical to this one peaked at 242 HP on the dyno. The only reason I’m selling it as I just bought my old 280 back and something has to go. Motor can be demonstrated and installation is available. Trades-ins of similar Mercury outboards will be considered. $7800 Firm, Call or Text me (Mark) at 757-84six-897one.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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tux974, Frank Molé liked this post
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02-13-2019, 08:30 AM #25000 RPM
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You have leak-down numbers?
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02-13-2019, 09:12 AM #3
UPDATED COMPRESSION READINGS. Readings were taken with engine warm and throttle open. Also verified the readings with 2 different Snap-on compression gages. They didn't change much from the original cold readings.
Leakdown was less than 4%.
Compression
1-145#
2-144#
3-149#
4-148#
5-148#
6-144#
Leakdown
1- 3%
2- 3%
3- 2%
4- 3%
5- 2%
6- 3%Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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03-07-2019, 08:30 AM #4
Back to the top. This powerhead is exceptionally clean and runs great. Built with all top shelf components. High quality piece.
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2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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03-14-2019, 05:21 PM #55000 RPM
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Fat shaft or small shaft lower
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03-15-2019, 05:26 AM #6
Smallshaft
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2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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03-15-2019, 05:34 AM #7Screaming And Flying!
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03-15-2019, 06:01 AM #8
Thanks Greg
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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03-28-2019, 09:24 AM #9
Back to the top. Come on...you know you want it.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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03-28-2019, 09:55 AM #105000 RPM
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What charging system and flywheel does it have?
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03-28-2019, 02:24 PM #11
The charging system is a factory 40 amp system but with the lighter factory red flex plate flywheel ( used on the early model 40 amp systems). The flywheel has been indexed. The engine is essentially stock with some minor component upgrades. And before anyone asks, the heads are factory stock, not cut. I do have some other heads available to the buyer.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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03-28-2019, 04:06 PM #12
Those are really great compression numbers for stock heads and block.
Really nice package you got there....James H. W2F a V-King... Want 2 Fly a V-King
Dedicated Site for Hydrostreams >> http://hydrostreamforums.com/
My Project 1979 V-King restore >> http://hydrostreamforums.com/viewtopic.php?f=9&t=2761
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04-03-2019, 10:24 AM #13
Updated Post #3 with recent hot compression numbers and verified gage.
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2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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04-23-2019, 09:28 AM #145000 RPM
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Stock from factory they should b lower no...?
11757 btw lol
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04-25-2019, 07:06 AM #15Screaming And Flying!
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