2005 90HP TLRD YAMAha Enrichment valve

[drumbeat88]

I have been reading this forum for years and have maintained an awesome boat so THANK YOU Long story short...been running boat for 10 years....purred like a kitten...sat for a year(hard times) Started engine(stupid since I did not check gas) Drained separated gas(disposed of properly) worked and worked to no avail on engine....seafoam, everything(plugs, pump, ball, 10 micron, checked lines, plugs...etc.).....I maintained this engine for 10 years, and the boat....no service ever, since I did everything. Anyways, turned in to a shop to see what was happening(carbs and a broken oil link) I knew this already but did not have the time nor the proper tools to do(compression check) Carbs rebuilt and link fixed-920.00 later, tested engine and it runs much better but not like it did....idle ramps up and down slightly, engine rocks much more, and fuel enrichment doesn't work. I always test emergency since I am out on salt and safety is key for me....not to mention that I have never broken down on water and don't wish too. QUESTION? Shouldn't enrichment always run unless in the closed position(normal or emergency) if I recall, it will always run the engine in either position. Engine runs in normal but emergency, immediately stalls. Make me nervous because I had to use one time on salt and got me back to dock. Thoughts? Thank You for your time on reading this, I should have become a marine mechanic

[boscoe99]

The engine will run in either of the three positions.

In automatic model the Prime Start device is con*****ing the supply of additional fuel to the carburetor. More when the motor is cold and less or known when the motor is hot.

In the on/open mode additional fuel is provided all of the time. When warm the motor will run rich.

In the off/closed mode no additional fuel is ever provided. When cold it will be hard to start.

[drumbeat88]

THANK YOU Boscoe99 ! Soo, with that being said, I have been running it in the normal position I'm guessing......(all the way to the left which is normal, middle is open, and right bottom is closed?) I just can't find the right documentation on this....not even in the manual. I guess I will need to look into that more. When I move to open or close, engine immediately stalls.....I am guessing that the emergency starter valve is dirty? I would have thought that the shop would have checked this as my specific instructions was to give the motor a complete checkup and get it running....I am at a lost on what to do.....what are your thoughts if you don't mind me asking? And thank you so much for your time

[drumbeat88]

I walked away for a minute and thought about what you said Boscoe...I understand now exactly what you are saying so thank you....I am guessing that the emergency starter valve IS dirty and will need to be cleaned?

[99yam40]

while playing with my C40 TLRX and installing a clear hose out of the system
I have found that when you switch to e position, it (prime start system)will pump liquid fuel into the hose leading to the intake that feeds all 3 cylinders through internal passages.

If carb passages are in good condition and you have it in e mode the extra fuel will cause an over rich condition and cause motor to flood out.
even when you have a hard time starting because of clogged pilot passages
the extra fuel in e mode is not meant for running, just starting and warming up. But I could be wrong on this
manual says to switch it to the off position one started if I remember correctly.

In the auto position , I did not see anything flow so it must be a enriched vapor heading through that hose to the manifold not liquid fuel

In closed position there should not be any extra fuel flowing through the system, so if still cold it would die, but once warmed up it should keep running if the pilot passages are clean and furnishing the proper fuel needed

[drumbeat88]

Thank you! I have been reading and searching, finding more info about this(Thanks Boscoe99)....I was just typing the wrong search terms I guess. I just found it weird that the engine is running fine on normal, but totally stalls when open, immediately stalls....I just don't recall this ever happening before. I could always switch to e mode(open) and rpms would go up but engine still runs. I only do this as a test or when engine is cold. I just got boat back today and began some tests before I hit the Salt this week. I guess I will be ok, just monitor and see how she runs on the water. I can definitely tell the carbs have been cleaned though. Just didn't know if something was missed with this valve.

[drumbeat88]

it definitely stalls on open or closed position....immediately stalls, cold or warm. Thanks again 99Yam40 and Roscoe I will need to further research I guess, maybe this is normal?

[drumbeat88]

I also reviewed the manual again and yes, you are correct 99Yam40.

[99yam40]

it definitely stalls on open or closed position....immediately stalls, cold or warm. Thanks again 99Yam40 and Roscoe I will need to further research I guess, maybe this is normal?

I do not see where once motor warmed up it would hurt to put it in closed position.

might need to contact the people that did the work and charged you all that money

[drumbeat88]

I contacted the shop and they were very nice in talking with me....This is such a long story to tell everyone all that has been done. I just want my boat back operating like it should. A 90 2 stroke is not a complicated engine and in 10 years, I have never had an issue.....until I LET IT SIT WITH ETHANOL...I use treatment Startron and ringfree but this time, I did not have enough in the gas AND I did not have a FULL TANK.... Anyways, I did not receive my compression readings and obviously did not have a certified master YAMA tech work on the boat as I requested. They were apologetic and requested I bring the boat back in, they guaranteed to make it right. Told me the name of the mechanic I will meet (who I researched and found on Yamaha site as CERTIFIED Master Tech, and the one who I was hoping would work on my engine but I did not let them know this) I also found out that the other 3 working at the shop were let go....So off to take the boat back to the shop since I spent all that money, which I think is a little steep for just carbs rebuilt and oil link fix. I will update when I get the boat back and run it. Thanks again for your time, input, and advice. I have learned so much from these forums And by the way, noticed I was auto corrected to roscoe...lol, they should read Boscoe99