r/MercuryOutboards

Mercury 110 9.8 (1972) only starts WOT

I’ve been trying to get this outboard back up and running and have hit a wall. Started about a year ago but wiring was cracked and corroded. Confirmed spark, compression and fuel. New spark plugs, points and gapped to spec, rewired corroded wires, replaced impeller, rebuilt carb and fuel pump. It will not start in neutral, even with some premix sprayed into the carb, but if I shift into forward gear to WOT it starts after a few pulls. Cuts out when I try to throttle down to put into neutral. I went through the steps to check timing from the service manual and timing seems correct too.

Any idea what is causing this issue? New to outboards and looking for some guidance, thanks!

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u/Twanz8 — 2 days ago

▲ 1 r/MercuryOutboards

Can’t find carburetor gasket kit

I’m having a hard time finding the parts I don’t know where to look if anyone finds this gasket kit it would be greatly appreciated.

u/blakejames41 — 3 days ago

▲ 3 r/MercuryOutboards

What can you tell me about this model

Came with a lovely boat my buddy just got a steal on. I have no experience with mercurys, but im volunteering to be it’s maintenance guy

u/Clovehitch1312 — 4 days ago

▲ 2 r/MercuryOutboards

Mercury Verado missing part and fuel lift

I recently got a boat with two 2015 verado 225 outboards that have been sitting for 8 years and only have 30 hours on them. I was told there were serviced once in awhile but really never used so I wanted to do a full service on it and took FSM apart to clean. Both the high pressure fuel pump and a low pressure lift pump we're working but they look like they should be replaced. Should I just replace these? They are kind of expensive.

There was also a bit of debris and powdery residue inside the FSM reservoir so I'm cleaning that out. Any recommendations for how to clean that out what I use a solvent or anything?

Also when I change the water pump impeller I noticed that one motor had part number 33 in the link below but the other motor was missing. Boat motors ran finally tested in forward and reverse. Is it bad that this part's missing is it super important?

https://www.mercruiserparts.com/bam/subassemblydetail/50941017/28203351

u/ChuckFinsky — 4 days ago

▲ 1 r/MercuryOutboards

1996 Merc. 4 cyl 40 hp 2 stroke

Over the weekend when installing an audio amp. I accidentally hooked up my power leads to the battery backwards. Boat still started and ran for the day but now my battery gauge reads low. The fuse under the hood (20amp) was not blown. What do you think it is? I’m guessing the rectifier.

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u/SeaChampBig_C — 3 days ago

▲ 5 r/MercuryOutboards+1 crossposts

Not running

Its a 95 25hp 2stroke, would run on muffs but not with a load. Ive rebuilt the carb and changed spark plugs, now no matter where I adjust the air fuel screw it wont stay running for more then 1 or 2 seconds. It's holding prime on the fuel system.

u/Silly_Pineapple_8182 — 5 days ago

▲ 1 r/MercuryOutboards

40hp 4cyl 2carb

I got this 1990 40 horse that im trying to figure out a leak on. I just found out that im missing a key/keeper for the bearing carrier in the lower unit. Could this little key (just ordered one) really cause a big leak? Is there any special steps i need to take when reinstalling the bearing carrier? Gasket maker??

u/Particular_Salad_851 — 6 days ago

▲ 1 r/MercuryOutboards

Going past the recommended 300 hours on alternator belt

As the title suggests, how exact are folks when replacing the alternator belt at 300 hours, which is the recommended interval for my 2019 Mercury 150 outboard. I am at ~285 hours in the middle of salmon season and don’t want the boat in the shop right now. Of course I don’t want a failure on the water either! Any input appreciated. 🙏

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u/Western_Meat_554 — 7 days ago

▲ 4 r/MercuryOutboards+2 crossposts

Started boating and blew a cylinder out shortly after running down the lake. Can’t figure out what this shrapnel is from. 2003 235 efi

Finally got the pontoon on the water, got all loaded up and started running the lake. About half hour in it started making a weird noise and lost power. Took the heads off, piston is destroyed and wrecked the head. This shrapnel is what caused the damage but can’t find anywhere it could have came from. The rings are in tact so it’s not that Reed valves are in tact.

u/AlwaysLurking237 — 10 days ago

▲ 2 r/MercuryOutboards

Mercury Verado 225 help.

I have twin 225 verados. took it out for a quick 5 min spin yesterday just got to see how it went. Started out great both fired up /, sounded great and ran them up to 4500 rpm 26 knots for a bit then when headed in, the port would just lose rpms, and go down to about 2000-2500.

Now today when flushing them out with ears on, the port fired right up but didn't pee right away. Started peeing after 30-45 secs. After a bit it got to 190f so I turned it off.

Starboard would not fire up at all and said communication error. Pic attached

It's a project boat but motors only have 30 hours however, haven't been used in years aside to fire up and do service here and there.

Honestly, I just need to take it on for full service which was the plan anyways, but wondering if anyone has any ideas on hats going on.

Thanks

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u/ChuckFinsky — 10 days ago

▲ 3 r/MercuryOutboards+1 crossposts

Mystery part 1990’s 25hp 2 stroke

I am doing a rebuild on a 1990/ Mercury mariner 25hp 2 Stroke outboard, and putting everything back to together I have found a bracket that I can’t seem to remember where it goes. Can anyone help identify the part and the location?

u/Rok4331 — 12 days ago

▲ 1 r/MercuryOutboards

Marine gas can question

I have a couple Mercury 225 verado 4 strokes that I can't hook up to our boat gas tank for a bit and need to buy a couple marine gas tanks. Does the marine gas tank need the bulb on the hose to help pressurize or suck the gas in or does the motor do that?

I was just going to go to Walmart and buy one or two 6 gallon scepter Neptune Marine tanks but I don't think they come with the hose and bulb

Thanks in advance guys

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u/ChuckFinsky — 12 days ago

▲ 5 r/MercuryOutboards

Early 90’s 9.9 check ball

I have an early 90’s 9.9 that I lost the check ball while cleaning the carb. Does anyone know the size it may be? Or what the carb number is? Also considering just ordering a new carb off Amazon, just trying to figure the right one. Serial number in pic

TIA everyone!

u/cam_loh — 13 days ago