Rebuilt carb/Merc 120 starts to die on acceleration then continues to run normally.

[Joshua Nichols]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Lucky for you both carbs that came on that engine are easy to do a rebuild on.. Plus the rebuild kit is cheap...

Do ya have the repair manual yet? Get it if not.. There is a free down-loadable online version that is nice to use if you have a printer... You can print off the part you need.. Then later print on the back of the page or wipe a dipstick on it..

Both are good to have.. Book and the one on the computer

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Lucky for you both carbs that came on that engine are easy to do a rebuild on.. Plus the rebuild kit is cheap...

Do ya have the repair manual yet? Get it if not.. There is a free down-loadable online version that is nice to use if you have a printer... You can print off the part you need.. Then later print on the back of the page or wipe a dipstick on it..

Both are good to have.. Book and the one on the computer

Yep already have the manual. Im up for an easy rebuild especially if there is a kit. Too bad there isn't a drain plug on the fuel tank... Maybe ill just pull it out of the boat completely and dump it in a economically friendly way.

Where is a separator commonly located? I've seen one before but it was for an JET-A fuel tank... I imagine the one I'm looking for is much smaller. Im pretty sure I don't even have an inline fuel filter so I probably don't have one of those either. I'll have to consult the Mercruiser section on the fuel filter... Sounds more and more like my bogging out of the whole is carb related... I'd rather it be that than soaked foam...

 

[not enuf toys]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Save the gas for the lawn mower, they don't mind it!

Fuel seperator looks like an oil filter usually towards the front of the motor towards the botom

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Save the gas for the lawn mower, they don't mind it!

Fuel seperator looks like an oil filter usually towards the front of the motor towards the botom

Nope. Don't have one of those. I'll syphon the tank tomorrow and try ALL fresh gas sometime this week before decided to rebuild the carb. It runs good at idle, no sputtering or anything. It's only when I'm trying get out of the hole or adjusting throttle when it sputters. Carb could be dirty even though it is smooth running?

 

[not enuf toys]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Yeah will idle fine, but once high speed jet is needed that's when sputtering starts.

First, start oven with new gas
Run it
If still acting up jets mostlikely need replaced as they are loaded with crap from the bad fuel

Been there on this exact smae scenerio wit a boat. Ultimately rebuilt carb and ran like a dream,

I learned right there and then, full tank of gas with stabil and fog motor before storage

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Yeah will idle fine, but once high speed jet is needed that's when sputtering starts.

First, start oven with new gas
Run it
If still acting up jets mostlikely need replaced as they are loaded with crap from the bad fuel

Been there on this exact smae scenerio wit a boat. Ultimately rebuilt carb and ran like a dream,

I learned right there and then, full tank of gas with stabil and fog motor before storage

Think I'll be fine just syphoning or should I put it and have it sanitize by a shop or something?
I think I'm going to go after the cap, points, wires and plugs while I'm at it.

Going back to the prop. maybe it can run good with the 14x19. or maybe i should get what JimS123 database has 15 1/4" x 19 and shoot for 43 MPH or could that bog the engine more?

 

[not enuf toys]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

I would get her running right first. You won't know true wot until you do...as of right now your current prop sounds too big with too much pitch.

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Could the fact that is too big and too great of pitch cause a quick vibration when getting out of the hole? Or do i have another problem? the vibration is audible and happens for about 1.5 seconds (when getting out of hole) and then does not return, and does not occur while turning, etc... engine alignment perhaps? Hoping its a bad prop. (doesnt look too bad though unless its simply the wrong one)

 

[not enuf toys]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

not to sure on a confident answer for that one. could be 1 of several things...address your issues one at a time and you will find that they are related. fixing one may fix another )

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Ended up pulling tank to drain nasty gas, was hazy and had weird particulates in it. Going to fresh gas with WOT tomorrow evening. I put a bottle of Seafoam in before I filled. Figure it couldnt hurt.

 

[Joshua Nichols]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

I put a bottle of Seafoam in before I filled. Figure it couldnt hurt.

I wish adding a can of fuel crap would fix things... It won't.. Draining the nasty fuel will help though.. Change the filters

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

I wish adding a can of fuel crap would fix things... It won't.. Draining the nasty fuel will help though.. Change the filters

.............what filter.........

 

[Joshua Nichols]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

.............what filter.........

You need a water separator.. But if ya don't have one.. The carb should have a strainer type filter in it where the fuel line connects

http://www.iboats.com/Fuel-Water-Se...2504708--**********.508742273--view_id.187573
These are nice to have.. HINT HINT

 

[JimS123]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

I'm not an expert... does this look like its sitting low (taken yesterday)?

At rest in the water with no people on board, the waterline stripe should "just" be out of the water across the transom. If its under water you have water in the hull, or one heck of a load of beer on board.

You should have 2 fuel filters - a metal screen at the fuel line into the carb, and a cartridge on top of the fuel pump. OEM or Sierra parts are $16 and it takes 2 wrenches and 10 minutes to replace them. The directions are in the owner's manual, and its listed as "owner maintenance" as opposed to a "dealer repair".

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

At rest in the water with no people on board, the waterline stripe should "just" be out of the water across the transom. If its under water you have water in the hull, or one heck of a load of beer on board.

You should have 2 fuel filters - a metal screen at the fuel line into the carb, and a cartridge on top of the fuel pump. OEM or Sierra parts are $16 and it takes 2 wrenches and 10 minutes to replace them. The directions are in the owner's manual, and its listed as "owner maintenance" as opposed to a "dealer repair".

By waterline stripe I assume you mean the 3 parallel vinyl strips?

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

The port side looks lower than the starboard, but there is a full 17 gal tank sitting all the way aft, port side.

here is an out of the water comparison. those lines are pretty darn low, those are supposed to be out of the water?

 

[JimS123]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

By waterline stripe I assume you mean the 3 parallel vinyl strips?

Yes, that's the waterline stripe.

I got my information looking at the 1983 Stingray catalog. The pictures there are a bit clearer than the one you posted.

Mine is a 19' model and I have the same fuel tank configuration. Except that I also have a aux 9.9 outboard on the stbd side, plus a 6 gal tank right in front of it. So, basically, I'm a little stbd heavy, and thus mine at rest leans maybe 1/2" to stbd. I never ran the boat without the 9.9 so I don't know what it would be with the factory config.

Regardless, since your battery and trim pumps are mounted stbd, my guess would be that it should sit pretty level.

 

[egleas84]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

The furthest rear of the top stripe is only about 1" under water; that doesn't seem like much to me. Especially with full tank and a heavy 750 cca battery.

Planes great with a new prop, carb rebuild, and a tune up. Thanks for the input guys! Seems that im not too water logged.

 

[Joshua Nichols]

Re: Prop pitch not big enough?

Re: Prop pitch not big enough?

Don't forget you got than funky fuel out too... Glad ya got her running right..So what kinda speed and RPM ya getting now?

 

[egleas84]

Rebuilt carb/Merc 120 starts to die on acceleration then continues to run normally.

I had my marina rebuild my carb. Solved some hesitation problems but created a new one, of course. When I start to accelerate I get on plane get around 2800-3200 RPM's then it starts to slow down, sputter, and feels like its just going to kill; leaving it alone it just picks right up again after 5-10 seconds and gets up to speed nicely and stays there. It only does it if its the first speed up after a complete stop/engine shutoff and it had sat for a couple minutes. If I don't shut off the engine and speed up, slow down, then speed up subsequent times it doesn't do it. It also idles well regardless. It was hard to start the first time after the rebuild too.

Obviously I'm going to call them on it, but I wanted some theories first is it getting too much gas and flooding? Fuel filters replaced, new gas, etc... the only thing I haven't done is install my fuel water seperator, but it didn't do this before the carb was rebuilt so I doubt its water.\

Thanks!