Now what ?

letsbarbq

Petty Officer 1st Class
Joined
Jan 6, 2002
Messages
241
I am really dumbfounded right now ? Maybe someone can help. I got a good compression yamaha motor. Before taking it out I change water pump, gear oil and fired it up on the hose. it was rough, it spit and sputtered for a few seconds then cough and died. So I got the carbs cleaned. I ran it last weekend and it seemed to run fine. But it still spit once a while and cough and die at low idle. So I decided to decarb the motor Last week. I didn't replace the plugs. I took it to the river and ran it, it ran fine. It also died at low rpm a few time. I assume it is the spark plugs. So I left it alone because the work week began. Friday I took out my gas sender and then put a rag over the hole and went to test the sender and gauge. Found out it was the wire going from sender to gauge. Things popped up and I forgot to put the sender back in. It rained over the weekend but I had the deck covered. Then Sunday I noted that the rag over the hole was wet. So I put in the sender. And I put in a new water separtor. I just got around to putting in new plugs today. I took her to the river awhile ago. Couldn't even get her started. As soon as I start her. She would spit, sputter, then pop and die. 30 mins. no luck. <br />Did another compression check now. Its all 115-120. On the water hose, she is rougher now then it was before I had the carbs redone. Its hard to start now. I also bought a fresh 6 gallon test tank and tried it when I was on the river and when I was on the hose. No luck. I pulled the cowler off and saw that the filter on the motor was half full of water. This is the clear one with the spring in it. I took it out and empty the water. Where did the water come from. Then it hit me. The sender hole. <br /><br />The carbs had a bolt that I took out to drain the bowls. I did all of them except the lower left one. This is if you are looking at it from the front to the transom. There are six. Couldn't get it off. I re prime the motor and she still acted the same. Do you guys think the carbs need to be cleaned again cause of the water that may have gone into it? But I didn't run it. I couldn't even get it off the trailer in Revs. had to just pull it.<br /><br />any help would be appreciated. I'm almost ready to throw in the towel. What am I doing wrong.
 

tpggolf4

Cadet
Joined
Jul 31, 2002
Messages
12
Re: Now what ?

how old was the gas before you ran the test tank? <br />If the gas was old all the cleaning was for not, and motor needs recleaning. Also need to replace fuel lines and clean anything old gas might have ran through. If gas was good check choke and primer bulb.<br /><br />You will need to drain tank with that much water in the seperator.
 

tuber

Cadet
Joined
Jul 20, 2002
Messages
22
Re: Now what ?

Like tpggolf4 said about the gas, and put the battery on a charger, lots of cranking + not much runtime = low battery = weak spark.
 

rbu

Seaman
Joined
Jan 17, 2002
Messages
66
Re: Now what ?

I agree with the others. How old was the gas in the tank? I think you are going to have to drop the carbs and give them a quick cleaning to be sure there is no contamination. Then I would stick to the 6 gallon tank until you are sure the motor is running perfect. If your fuel lines haven't been changed, now would be good time to do it.<br /><br />And if you did have bad gas, you have to get it all out. Before I got my boat, it had sat for a few years and someone had removed the fuel filler cap, so I had a 100 gallon tank filled with 50 gallons of gas and 50 gallons of water.
 

Gold Bear

Petty Officer 1st Class
Joined
Sep 26, 2001
Messages
224
Re: Now what ?

Lets Bar -b- q <br /><br />You had a rough idle before the water problem came along. "Cough and die" sounds like the idle mixture is lean.<br /><br />Squirt a little pre-mixed fuel in the carb and see if it will start. If it start, then coughs and dies, open the idle mixture screw about 1/2 turn and see if that helps.<br /><br />Do this after you have gotten the water out of the system. For the tank that got water in it, I would consider pouring some alcohol in it (put just a few gallon of gas in), drive the boat around on the trailer to mix it well, then pump out as much of the fuel as you can.<br /><br />Good Luck, Gold Bear ;)
 
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