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Old 05-11-2009, 01:42 PM
  #1    
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Default 2005 Yamaha 115 2 stroke - Starting problem

Hello -

I recently purchased a 2005 115 Yamaha 2-Stroke and have had quite a bit of trouble cold starting the engine.

Once the engine is running and warmed up it turns over fine.

I think I am following the correct procedure:

1. Pump ball on fuel line til hard.

2. Push the throttle forward and back 3 times in nuetral
(This is a single level throttle - you have to push the button in on the side to throttle in neutral.)
Then leave the throttle a bit forward - say about 15-20 rpms if the motor was running.

3. Push down on the key for 3-5 seconds and turn the key while it is still pushed down.
I hear the choke engage (clicking noise)

Eventually I get the motor to start after about 10 time of cranking.

I have tried using the manual choke instead of the key choke - no luck there.
I have tried not pushing the neutral throttle forward - no luck.

It seems if I have one person pumping the ball while I crank, it starts on like the 5th attempt and not the 10th.

This is what I was planning to check - in this order:

1. The fuel filter.
2. The spark plugs
3. The ball on the fuel line (to make sure the one way valve is closing)
4. Making sure the choke is working properly.

if anyone has some advice it would be much appreciated.

Thanks,

James
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Old 05-11-2009, 02:21 PM
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Default

James -

Where did you read or who told you this procedure? Cranking the throttle is an inboard engine technique because there is no choke.

When the engine cranks, right after turning the key, does it turn over FAST? Is the battery new or in good shape?

Define cold. When not used or when it is 40 degrees outside.

My 1987 90 hp would take forever untill I learned the right procedure.

Try this -

A)
Prime the fuel
Leave throttle in neutral
Push and hold key (choke) and turn over 5 seconds. (1 mississippi, 2 missisippi)
Repeat 5 times.

If no joy then B)

B)
Prime
Advance the throttle 1/2 way and leave it there (when she starts, throttle back to N ASAP!)
Push key in and turn over 5 seconds.

If the engine fires, even for a millisecond,reduce throttle to neutral and use choke and turn key (with choke) for 5 seconds.

If you use the throttle advance without the choke, you will flood the engine.

Report results.
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Old 05-11-2009, 03:36 PM
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Is this a fuel injected 2 stroke? On my SX 150, I never prime the bulb and I start with the throttle in idle position. It starts every time within 4 or 5 seconds. Even though you can press in the ignition key to 'engage' the choke, there is no choke per se on the EFI Yamis.
If it is carbureated, that is a different story but shouldn't have to pump the throttle before starting
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Old 05-11-2009, 03:53 PM
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1=Do not pump the throttle, thats not doing anything
2=Do not leave the throttle forward a bit, most carbed engines that lessens the effect of the choke
3=pushing the key in before the engine cranking does nothing, the engine needs to be cranking to suck raw fuel from the choke.
4= don't assume it needs choke,crank it first see if it pops, I bet it will but it will die right away so then just bump the key in(choke) for 1 sec while cranking It will start then if she sounds like shes going to die bump the choke again just for a sec.

The problem your having is common people think the carbed outboard chokes are like a car, there not when you push the key in(choke) it pumps A LOT of raw gas into the carbs 3-5 sec is way too long just a touch will do give it a try
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Old 05-12-2009, 02:14 PM
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Default Thanks for the info

Hello All -

To answer some of the questions:

to CascoBayOtrage:

The previous owner told me the procedure.
yes the motor is attempting to start quicly - does not sound like the battery is rundown.

The air temp has been about 60 - Cold meaning the engine has not been started in a few days.

to lostsinker:

It is carb.

I printed out all your advice and will try tomorrow to start her up again tomorrow and let you know what the outcome was.

Thanks again.
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Old 05-13-2009, 01:13 PM
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PP1
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I've got the 130. This is essentially the same motor you have. I also had a hard time starting mine for a while when it was cold (meaning not used in the previous 12 hours). This is what I do now and it is almost always easy.

1. squeeze bulb until hard
2. advance throttle slightly (12 to 1500 rpm)
3. push key in and turn (sets choke and starts cranking)
4. after a couple of seconds it will sputter
5. turn key (do not push in)

It almost always starts on step 5 within a couple of seconds.
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Old 05-13-2009, 01:33 PM
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Quote:
Originally Posted by PP1 View Post
I've got the 130. This is essentially the same motor you have. I also had a hard time starting mine for a while when it was cold (meaning not used in the previous 12 hours). This is what I do now and it is almost always easy.

1. squeeze bulb until hard
2. advance throttle slightly (12 to 1500 rpm)
3. push key in and turn (sets choke and starts cranking)
4. after a couple of seconds it will sputter
5. turn key (do not push in)

It almost always starts on step 5 within a couple of seconds.
I had the same motor as well on my old Action craft and your procedure was exactly the same as mine and worked every time.
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Old 05-13-2009, 02:35 PM
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Default Starting much better now - Thanks all.

hello -

this procedure worked well today. it is mostly what brwonman said but pretty much the same as everyone else that posted yesterday:

1. Pumped ball.
2. Turned key with no choke or neutral throttle for about 4 seconds - motor turned over an died instantly.
3. turned key again and pushed down after it started to crank - only about 1 second. This time the motor turned over and ran for about 5 seconds and sputtered out.
4. put the throttle fwd (in neutral) just a touch and turned key and again pushed in key to choke for about one second - motor turned over and stayed running.

Lots less smoke and ran smooth - no sputtering.
I didn't believe that this was so sensitive in terms of the amount of fuel getting to motor in order to start. I was clearly flooding the engine before.

Thanks again everyone - now I can go get some stripers.
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Old 05-13-2009, 07:53 PM
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have a 05 150. i never let it go a week without runung it but when it does get to that week long point its clock work and works everytime.

1.pump ball

2. nuetral rev to 2k rpm range

3. push key in and turn

4. fires everytime, sometimes it stays running, when it does i let it run reved up just above 1k rpms for 2 min. when it sputers and shuts off:-

5: nuetral rev again, but this time without choke. (after it fires you dont really need nor want to choke it anymore, that will flood it.)

its about feeling out your engine, my old yammer was a different set of steps. its all about figuring out what your little "hole in the water" likes
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