


Mercury/Mariner 65-125 Hp L3 / L4 Top Guided Connecting Rod 800-204, 646-818846
Marsoni
M251S
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Friday, May 29
Mercury/Mariner 65-125 Hp L3 / L4 Top Guided Connecting Rod 800-204, 646-818846ITEM#: 800 204 CONNECTING ROD MERCURY MARINER 65 125 HP L3 L4 OEM#: 646 818846A3, 646 818846T6 BRAND: WSM FITMENTS: Make Model Year(s) Mariner ALL Mercury 3 Cyl 3. 375 Bore Looper 70 1987 1990 Mercury 3 Cyl 3. 375 Bore Looper 75 1987 1993 Mercury 3 Cyl 3. 375 Bore Looper 80 1987 1990 Mercury 3 Cyl 3. 375 Bore Looper 90 1987 1993 Mercury 3 Cyl 3. 500 Bore Looper 75 1994 2006 Mercury 3 Cyl 3. 500 Bore Looper 90 1994 2005 Mercury 3 Cyl 3. 6255 Bore 1. 5L
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4.1 ★★★★★
Based on 653 reviews
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Product Reviews
★★★★★ 5
If pump doesn't seem to work
Size: For 85-300 HP, Size: For 85-300 HP
Hi....I apologize it took me a while to get back to you with my results. Here is what I discovered about the pump and will also apply to some of the other comments I read in the reviews with people not getting the pump to work:
1.) I removed the pump to check the proper direction of the impeller and it was correct as can be seen in the photo.
2.) I built a pump shaft attachement so that I could operate the pump with a power drill.
3.) I attached the water muff to the unit and tried to pump water.....it wouldn't do so. What I did see however was that even at high hose discharge and small leakage at the muff I could not fill the water cavity in the housing.
4.) I installed a strap around the muff and tightened it very tight and THEN at high hose pressure I was able to get the cavity to fill with water.
5.) At that point I activated the drill and was able to get the pump to actually pump water. I then removed the pump housing and removed the O-Ring that resides on top of the impeller, reassembled and it would not pump water. Since the O-Ring sits higher than the original does I wanted to make sure that it was necessary to have it in the pump.
6.) I reassembled the engine and kept the tight strap on the bottom and finally it pumped water into the engine.
My conclusion that you can reply to other buyers if they have a problem:
Do NOT underestimate 2 things....1.)the lack of ability of the pump to draw water up AND 2.)the fact that if the muff leaks it will NOT fill the cavity when common sense says it should. This was a 120hp Johnson. The engine bottom must be immersed fully or the muff must be very tight on the lower unit for the pump to function.
Please feel free to post this if you wish.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 12, 2024
★★★★★ 5
Exelente
Size: For 85-300 HP
Exelente
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
★★★★★ 5
Good as new
Size: Package Dimensions 6.02 x 4.02 x 2.05 inches
Fitment was great and works as it should. Good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2025
★★★★★ 3
Incorrect motor listed. Far smaller impeller than what's in the 6 horse johnson.
Size: For 5.5HP 6HP 7.5HP
It seems to be of good quality. However it does not fit a 6 horse johnson as it states. Therefore it will not pump water or function for my purposes. It was a waste of money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2025
★★★★★ 5
OE Quality Part
Worked perfectly. Everything needed is there.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026