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Old 08-29-2010, 05:39 AM
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Default 115 YAMAHA hard to start

My 2004 Yamaha 115 is very hard to start when it has been sitting a few days. It seems not to be getting the fuel into the carbs. I can pump the bulb until it is tight and then engage starter with no results. I then pump the bulb again as it has become somewhat soft again.

This process occurs 3-4 times before the engine will fire. It does not even begin to try to fire until it actually does start which is why I think it is not getting the gas into the carbs. Using the choke or not does not make a difference until gas gets into the carbs?

With my OMC's you can hear the gas getting pass the fuel pump into the carbs. With the 115 you can not hear anything like this. This has been the situation since new and just assumed it was the way it was surposed to be. Wife has "encouraged" me to ask your advice.

After it has started, it cranks and runs without any flaws.

Would love to hear your thoughts and advice. Thanks.
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Old 08-29-2010, 06:36 AM
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Sounds to me like you are flooding the motor. First change plugs. Then use below for start sequence.

pump bulb till firm only once
engage choke (push in on key)
spin motor till start while pushing in on key till starts
lift idle leaver to about 1500 rpms or so till warm

You're carbs should not be running out of fuel at all unless you have major problems or you are running them out of fuel on purpose. When you pump the bulb until it gets hard what you have done is pump fuel into the bowls of the carbs till the floats have shut off the needles and seats because they are full and don't want any more fuel. If you keep pumping the bulb you are in effect flooding the motor. Only pump once before cold start once and do the above method and see if it doesn't start easier. I say change plugs and go with NGK not Champion they are garbage IMO.
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Old 08-29-2010, 06:54 AM
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Next time, when the motor is cold, pull the manual choke all the way out and start the motor without using the electric choke. If it starts up quicker, then you know that the electric choke is not closing the plates fully. It could be out of adjustment, have a weak solenoid, or too much voltage drop while the motor is cranking over.
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Old 08-29-2010, 07:37 AM
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Seahorse he said it has never started correctly when cold. I think it is how he is trying to start it more than anything. Not sure but maybe. Carbbed motors have to be started differently than fuel injected and we tend to forget that about setting the choke. Not possitive but I think there is no manual choke on a 2004 only the electronic one.
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Old 08-29-2010, 07:49 AM
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I had a 2001 115 and it never ran right and was always hard starting. I say never, but it did run right after having the carbs cleaned yearly for a month or two and then it would progress down the path of intermittent stalls and hard starting. It was even hard to start when it was warm.

I replaced the fuel/water separator and the engine fuel filter regularly, but it made no difference. I chocked it up to design and moved on. However, in hindsight, I bet ethanol had something to do with it. I never treated my fuel with anything until I started reading about Ethanol on THT. I sold the boat and motor because I was tired of playing the guessing game everytime I took it out.
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Old 08-29-2010, 04:46 PM
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Quote:
Originally Posted by seahorse View Post
Next time, when the motor is cold, pull the manual choke all the way out and start the motor without using the electric choke. If it starts up quicker, then you know that the electric choke is not closing the plates fully. It could be out of adjustment, have a weak solenoid, or too much voltage drop while the motor is cranking over.

What he said...

Its also possible the electric choke is not engaging. With the motor off, turn the key to the on position and press it in. You should hear the clicking sound.

If the motor starts fine when you pull the manual choke lever on the front of the pan, then either the electric choke needs to be adjusted, or the key switch may need to be replaced.
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Old 08-30-2010, 06:40 AM
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I have a 115, hard starting also. Runs fine once you get it. My certified Yammy mechanic says all of them do that. Has to do with the size of the air ports in the carbs.
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Old 08-30-2010, 06:52 AM
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Not sure which Yamaha you have, but we have a bunch of carb'd Yamaha 2 strokes. They can all be hard to start when cold unless you do the following. do this and they all start easily.
1) Pump up the primer bulb until firm
2) Lift the fast idle lever until you have applied some throttle (say 25% - 35% throttle). Note on some controls the first couple of inches of fast idle lever movement do nothing, so move past that point by say 1/2".
3) Push in the key (you should hear the click from the choke solenoid)
4) Whilst holding in the key, wind the engine over for a few seconds. If it starts, pull the fast idle lever back to say 1500rpm for a few seconds
5) If it doesn't start, pump the primer bulb again until hard and repeat the above process.
6) If it kicks and doesn't catch a few times. Try again with a bit more fast idle and without holding the key in

We have had 7 or 8 carb'd Yamaha 2 strokes and this has worked for all of them.
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Old 09-07-2010, 05:17 AM
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good morning, thanks to all for your ideas. "aliboy" seems to have hit the solution as using his method to start and things much better. again thanks to all for your help.
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Old 09-07-2010, 06:27 AM
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This works on every 2 stroke Yamaha I have tried. Must be 7 or 8 guys now that I have heard flattening their batteries at the boat ramps before I have gone over and suggested this method. Some guys give you that "I am embarrassed already so F off look", and others look at you as if you are a bit strange for offering unsolicited advice, but they all smile when their engines suddenly spring into life. It is also amazing how many guys think the fast idle lever is the choke and don't even know to push the key in to choke the engine.
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Old 09-07-2010, 09:22 AM
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I also have the 2004 115 yammi and this is what I do. Advance throttle 3/4 up. pull out manual choke. Crank it and it should start then die. 2nd crank starts it everytime. I used to use the automatic choke by pressing it in at the key but found it was inconsistent. This procedure now works wonders for me. Just make sure the battery is fully charged.
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