Yamaha 200 Carbs drain ports ?

jjjtronics · #1 04-07-2009, 07:16 AM

Saludos !

My boat has a serious problem with water in the tank, which leads to dirty and clogged carburators. I am tired of removing the carbs and cleaning them, so I`m looking for solutions to this. I cleaned the tank completely dry, found half a gal of H2O in there. I know is from condensation because when I gas the boat, a lot of water spits out of the air vent port.

Last time I pulled the carbs out, noticed that they have what seems to be a place to put drain fittings on the carb fuel cans. See photos.
I am planning to drill and tap for either fittings with hoses, or at least screws, so I can completely drain the carbs on my Yami without removing them. The 13mm drain bolts on the sides do not drain all the fuel out, they are only ports for the removal of the main jets.
Has anybody seen anykind of drain fittings on this carbs, OEM or mod.
I am planing to use fittings like the ones used on model airplane engines muffler-pressure fittings.
Any suggestions ?

Stillrunning · #2 04-07-2009, 08:04 AM

I have a Johnson and I have bowl drain screws on each bowl. Looking at you middle picture it looks like you have the same thing but on the bottom of each bowl (notice the brass screw on the bottom of the bowl). Do you have a seperator on the boat an if so you may want to switch the filter to one that has the plastic bowl on the bottom that you can drain. I know with E10 gas there are moister issues but if you getting that much water in you gas all the time its coming from some where. Where is your vent hose located and could water be splashing up and into the vent? Mine is turned slightly back to prevent that from happening. If you mix you oil and have a carbed motor its important to keep the jets clean as a cyl running to lean can burn up that cyl. I read somewhere that is the cause for like 90% of carbed motors burning up a cyl.

jjjtronics · #3 04-07-2009, 08:19 AM

Thanks stillr,
I have a water filter/separator ( big ), and I drain it every week. And water still gets to the separator/filter on the engine, so I drain them both every week, but the carbs still getting clogged with the jelly stuff that water/oil/gas together form, and the engine starts giving me problems about every month, so for me is a once a month carbs removal/clean.
I will install the drain screws and try that.

Monkey Butler · #4 04-07-2009, 10:06 AM

If you have water coming out of your vent hose when you fill up then I think you have found your problem. Water is getting into your tank through your vent. Any water in your tank would be at the BOTTOM and it would not have access to the vent which is at the top of the tank. The water that spits out must be sitting in a low point in the hose. I wonder if you could trick someone into tasting it to see if it is salt? Condensate would be fresh.

If you can route your vent hose so that it goes up some from the thru hull first that will help prevent water from getting to the tank.

Stillrunning · #5 04-07-2009, 12:18 PM

Quote:

Originally Posted by jjjtronics

Thanks stillr,
I have a water filter/separator ( big ), and I drain it every week. And water still gets to the separator/filter on the engine, so I drain them both every week, but the carbs still getting clogged with the jelly stuff that water/oil/gas together form, and the engine starts giving me problems about every month, so for me is a once a month carbs removal/clean.
I will install the drain screws and try that.

When I had water issues I never noticed any of this jelly stuff you are talking about. What coloer is this jelly stuff?

THEFERMANATOR · #6 04-07-2009, 12:20 PM

I have the same jelly stuff in my filter every 5 hours or so. I just chock it up to E-10 as others ahve the same issues with it. And those carbs have drains in them already, it's the bolt that goes into the bottom of the bowl to allow access to the jet in the bottom. You can see it in your 2nd picture.

Stillrunning · #7 04-07-2009, 01:43 PM

Quote:

Originally Posted by THEFERMANATOR

I have the same jelly stuff in my filter every 5 hours or so. I just chock it up to E-10 as others ahve the same issues with it. And those carbs have drains in them already, it's the bolt that goes into the bottom of the bowl to allow access to the jet in the bottom. You can see it in your 2nd picture.

I thought that was a bowl drain on the bottom of the bowl. I still don't get this jelly stuff you guys are talking about. Are your fuel lines rated for E10 gas or are they old? Is the jelly stuf black in color?

Monkey Butler · #8 04-07-2009, 02:07 PM

Oh, and those small screws in the last picture where you have arrows pointing to them with "Drains?" photochopped in... Yes they are the bowl drains and especially with the motor tilted up they will remove all but a drop or two from the carb bowls. There are even little drainage ditches molded into the bottom of the bowl leading to these screws to help them drain more. The larger brass nut is the main jet and it sits higer in he bowl so it won't drain everything.

But still, identify how the water is getting into your tank.

jjjtronics · #9 04-07-2009, 03:53 PM

The jelly stuff is light blue or gray, and it dissolves instanly if carb cleaner is sprayed into it.
For now, I will be riding with a couple of 6gal portable red tanks, and the main tank will be there holding air only. I am so tired of this problem that for now the main tank is decommisioned. If the problem goes away with the portable tanks, then I will start looking for a solution to this problem.
Last time I sailed, the motor quit on me approaching the dock, and before I managed to start it, I had hit the pier and bent/broke the SS rail.
My Yamaha 200 runs so smooth and reliable when fuel is clean, and the V20 is a dream to sail around, but a little water in the fuel can make it all worthless.
I am even considering pulling the main tank out and throwing 3 portable tanks in there, all I need to do is put hinges on the tank cover/deck.

macojoe · #10 04-07-2009, 09:49 PM

watch weren you get your gas from you might be getting it from them? Also ck your vent, I had a friend that was getting water in thur the vent cause the opening was facing front, when he was in ruff water it would splash up and go in the vent.
The fix for that was a big ss clam shell over the top of the vent, still vents and water will never get in there ever again.