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Stalls under light load. Good on hose but in water good at

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idle and wot but not...
Stalls under light load. Good on hose but in water good at idle and wot but not a light load
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Customer: Replaced the port side head due to hole through spark plug threads and changed bottom coil same side because spark would bite you but still runs the same
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Customer: No
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Submitted: 1 year ago.Category: Boat
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Answered in 5 minutes by:
6/21/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,293
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hello my name is ***** ***** am I speaking with?

What are we working on?

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Customer reply replied 1 year ago
My name is*****'m working on a 1990 yamaha 225. 225etxd
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Brandon.

What is the history on this engine? Have you ever personally seen it make full power?

Have you done any spark or compression testing on your own yet?

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Customer reply replied 1 year ago
Not sure if i have seen it full power. Had one issue when it was WOT for a little ride and lost forward momentum for a couple minutes but was fine ever since. I bought it about a year ago and haven't really had many issues. New OEM NGK plugs all coils now firing and compression is 120 +/- 2 psi
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

You have good compression, and you say spark is good. The next step would be going through the carbs and rebuilding them. Has that been done yet?

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Customer reply replied 1 year ago
No it hasn't was next course of action. Why would it be fine on the hose though? I'm an auto mechanic but not familiar with outboards or 2 strokes
Customer reply replied 1 year ago
You know I did start noticing one thing that I thought was not good. When I put it in reverse and gave it a little throttle the motor shook pretty good like it was misfiring
Customer reply replied 1 year ago
Last time I took it out we anchored on an island for a couple hours and when we were ready to leave it wouldn't start until I sprayed it with starting fluid then would only idle then after a little while was able to WOT but not light throttle.
Customer reply replied 1 year ago
Also is there a way you can tell me the test procedure for the tps
Customer reply replied 1 year ago
Sorry but another thing I noticed was on my fishfinder it would sometimes show almost 17 volts
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3,994
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
Verified

Hello, my name is***** you still need assistance with this engine?

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, First thing that we need to verify is that voltage on the battery with the engine off and then with it running at idle and then at about 2000 RPM. I am looking to see if it is getting over 14.5V DC and the reading on the fish finder is correct when it shows 17V.

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Customer reply replied 1 year ago
Well the tps connector was corroded so I rewired it. That took care of the stalling. But now when it's WOT for like 30 secs it will bog down to idle for a couple seconds then I can take off again. Haven't had the chance to check voltages yet
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Does the alarm test beep when you turn the key to on?

Are your oil tanks full?

Do you know how old the water pump is?

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Customer reply replied 1 year ago
No alarm test beep. Oil tank full but bypassed. Not sure on the water pump seems to piss ok. My gauges don't work either. Is it hard to hook up analog gauges to a yamaha?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Do you currently have digital gauges?

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Customer reply replied 1 year ago
I do but you can hardly see what they are displaying. The numbers are real faded
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Analog gauges really do not work for this engine. You would not have the oil pump fill function.

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Customer reply replied 1 year ago
Ok. So what do I do next?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Test the horn circuit for the engine. It should have power in with the key on, but will only have a ground for a few seconds. If that works, replace the warning horn. We need it working to know if you are getting an alarm at WOT or not.

Have you looked into the carbs yet?

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Customer reply replied 1 year ago
Ok i will. Do you have a diagram? And I haven't yet I will do that also
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

For the wiring or the carbs?

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Customer reply replied 1 year ago
Wiring for the alarm not sure where it is. Only reason I haven't gone through the carbs is because it idles and cruised ok and will even take off and get up to speed nicely just after a minute or less it bogs down
Customer reply replied 1 year ago
Was gonna try to do some trouble shooting when I get home. Will the buzzer go off if it's over heating or something like that?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Provided that it is still functioning, yes it should.

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Customer reply replied 1 year ago
Ok and if the voltage is true to 17v what next?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

If the voltage is really at 17V, the regulator would be bad.

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Customer reply replied 1 year ago
Ok i tested the buzzer wiring. Key on the yellow wire gets battery voltage and the pink gets 6 volts. I unplugged it and put power and ground and buzzer didn't work but I got it to work but still doesn't get ground
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

The buzzer should only get a ground when there is a fault on the engine.

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Customer reply replied 1 year ago
What about the test beep though?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Yamaha has changed it over the years, some have it, some do not, Hard to tell which does and which dont..

Ever do the running test for the voltage at the starter solenoid?

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Customer reply replied 1 year ago
Will do tomorrow
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

ok

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Customer reply replied 1 year ago
I decided to pull the carbs and go through them. Is there any specifications you know on the adjustments when putting them back together?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Set your mixture screws at 1 1/4 turn out for starters, you may need to adjust them once the engine is in the water and at idle.

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Customer reply replied 1 year ago
What about float adjustments? I found one lower then the other in the first carb
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Have it running and make small adjustments to it.

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Customer reply replied 1 year ago
You can't adjust floats without taking the bowl off
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

The floats need to sit level with the body of the carb.

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Customer reply replied 1 year ago
The alarm is going off now I'm on the boat
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

That is either oil level in one of the tanks or overheat, or voltage. Unplug the head temp sensors and see if it stops..

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Customer reply replied 1 year ago
There is never oil in the tank
Customer reply replied 1 year ago
It stopped when I unplugged the sensor
Customer reply replied 1 year ago
When I take off the port side it doesn't stop buzzing. Only on starboard side
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Either that head is hot, or the sensor is bad.

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Customer reply replied 1 year ago
Well it slows down and smokes
Customer reply replied 1 year ago
White from exhaust and boggs down
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

It is going into protection mode. That is why it is slowing.

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Customer reply replied 1 year ago
if it's over heating on one side. What do you think it is?
Customer reply replied 1 year ago
Voltages to spike at times
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

If the voltage is spiking it is the regulator that is going out.

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Customer reply replied 1 year ago
I removed both thermostats
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

The engine needs the stats to operate properly. Otherwise it will not come up to temp.

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Customer reply replied 1 year ago
Just want to see if the buzzer will go off
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok

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Customer reply replied 1 year ago
Still doing it
Customer reply replied 1 year ago
Water pump?
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Is the head hot to the touch? Is the sensor still plugged in?

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Customer reply replied 1 year ago
Yea I plugged it in and could hold my hand on head for a second or 2
Customer reply replied 1 year ago
if it was the sensor I don't think there would be white smoke though. Unless that's from it going in a limp mode
Customer reply replied 1 year ago
Maybe I'll put the sensor on the other side tomorrow and see what happens
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Provided that they are the same sensor, that would work.

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Customer reply replied 1 year ago
Swapped the sensors and still buzzing for starboard side
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

You are going to heave a blockage inside the water passages on that head. You will need to open it up and inspect it.

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Ask Charles Your Own Question
Charles
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3,994
3,994 Satisfied Customers
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.

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