yamaha 2stroke 30deo

[gvp90000]

Dear friends,
I have a 30d yamaha outboard purchased in Greece, Europe in 2004.
Recently i found a service manual and I started to read the timing settings.
This is what I found so far.
1. From 25 BTDC until TDC the piston movement is 3.70 mm instead of 3.55 stated in manual.
I dont know if this difference is important ... so this is my first question.
2. The full advanced magneto position is in TDC insted of 5 ATDC. Do you think its a good idea to change this setting?
3. And the most important question. Last year i removed the carbs for cleaning. I didnt setup the pickup timing setting and a friend told me to set it touching the throttle cam to the throttle roller while the magneto is in full retard position.
Since then i've noticed that the idle is ok but when while the rpm is rising (and in low rpm's) the motor is shaking more than before and in high rpm's its like before. Do you think this problem it's because of wrong pickup timing setting?
4. I've set up pilot screws according to specs but playing with them i didnt noticed any difference at idle. Is there any other method to optimize pilot screws settings?
5. The oil discharge test seems complicated... its important to do it every year?

Thank you
Bill

[boscoe99]

Need the complete motor ID. Something that starts with the number 6. Should be on a data plate on the side of the motor. With that I can get to a service manual. Then I can see for myself what it is that you are describing. I can show it to others so that we can then argue over what "is" means.

An oil discharge test sounds like your model uses the precision blend oil injection system. I don't know of anyone testing it. Ever. Might not hurt however if the motor is new to you and you just want to confirm with your own eyeballs that the system is working according to Hoyle. The Yamaha oil injection system is very very reliable. According to our very own esteemed (in his mind anyway) Master Mechanic rodbolt, aka rodnut.

[gvp90000]

Need the complete motor ID. Something that starts with the number 6. Should be on a data plate on the side of the motor. With that I can get to a service manual.

Do you mean the 6j8 ?

[99yam40]

Probably wants the other numbers along with that.

OP did you make sure the TDC marks on flywheel are lined up with pointer when the pistons are at TDC.

Timing will affect the motor idle some.
not sure I understand #2 question

[gvp90000]

Probably wants the other numbers along with that.

OP did you make sure the TDC marks on flywheel are lined up with pointer when the pistons are at TDC.

Timing will affect the motor idle some.
not sure I understand #2 question

I'm on vacations now so i cant tell you the Serial number. But i'm sure for these
Yamaha 30DEO
6J8 L ............ and SERIAL NUMBER is greater than 1 millon.
In Thusday i can give you the exact SN.
In the motor head has a label with 6J8K .......... and the same Serial number.

About question no2 see attached image steps 5 and 6.
In my motor the marks in magneto base and the flywheel are aligned at TDC and not at 5 degrees ATDC (my motor is not a PTT model)

[boscoe99]

Is you motor manual start or electric start?

Oil injection or premix?

[gvp90000]

Electric start
Oil injection

[boscoe99]

I would do exactly what the SM says to do, in the steps that it says to do them.

For those that want to follow along, here is the timing procedure:

[boscoe99]

Dear friends,
I have a 30d yamaha outboard purchased in Greece, Europe in 2004.
Recently i found a service manual and I started to read the timing settings.
This is what I found so far.
1. From 25 BTDC until TDC the piston movement is 3.70 mm instead of 3.55 stated in manual. I suspect that the timing plate is not correctly adjusted. The dial indicator positions the piston to 25 degrees BTDC based on distance of the piston BTDC and then the plate is set to indicate that in degrees.
I dont know if this difference is important Yes, it is important. ... so this is my first question.
2. The full advanced magneto position is in TDC insted of 5 ATDC. Do you think its a good idea to change this setting? Yes. Should be 5 ATDC.
3. And the most important question. Last year i removed the carbs for cleaning. I didnt setup the pickup timing setting and a friend told me to set it touching the throttle cam to the throttle roller while the magneto is in full retard position. Follow the manual. Ignore friends even if they have the best of intentions.
Since then i've noticed that the idle is ok but when while the rpm is rising (and in low rpm's) the motor is shaking more than before and in high rpm's its like before. Do you think this problem it's because of wrong pickup timing setting? Don't know.
4. I've set up pilot screws according to specs but playing with them i didnt noticed any difference at idle. Is there any other method to optimize pilot screws settings? Not that I know of. Just follow the settings specified in the SM. If the motor were to indicate a lean condition then you might want to turn the idle mixture screws outward just a tad to see if the problem is corrected. Just keep track of what you are doing or you will have to screw them all in and then reset them.
5. The oil discharge test seems complicated... its important to do it every year? Unless you suspect that someone has monkeyed with the system I would leave well enough alone.

Thank you
Bill

You are welcome.

[99yam40]

I would think that as long as you do not mess with the setting of the oil pump and you keep the oil tank clean and full of clean oil, there should not be a reason to check output any .

Keeping track of how much oil you use over time compared to the fuel you run thru the motor should give you an indication that the oil ratio is close or not changing very much

[gvp90000]

@boscoe99 , @99yam40

Thank you so much for the info ...

[robert graham]

Until you determine that the oil pump is operating/pumping as designed maybe consider running a 50:1 gas/oil mix in gas tank with motor running to avoid any damage....

[gvp90000]

Until you determine that the oil pump is operating/pumping as designed maybe consider running a 50:1 gas/oil mix in gas tank with motor running to avoid any damage....

Yes its writen in the service manual too.
Thank you, but i think i'll leave it untested because i dont have a problem with my oil pump

[gvp90000]

I would do exactly what the SM says to do, in the steps that it says to do them.

For those that want to follow along, here is the timing procedure:

Is this the correct service manual ?

My motors plate is this

[boscoe99]

Looking for something that looks like this.

https://www.nionwatersport-webshop.n...ha-heb-ik.html