225HP 2-Stroke restarting problem

[Robert_FL]

Thanks in advance for any assistance here.

I have a 1992, 2 Stroke 225HP Yamaha outboard. It has been checked out at the mechanic and rebuilt carburetors, new fuel lines, spark plugs, new dual batteries, they went through the motor to be sure it runs great. It does, with a caveat. If I start it up when I launch the boat or at home for the first time of the day, I simply press the key in to choke it, it starts and warms up, maybe stalls a couple times maybe not. Once warm ( 1 minute or so ) I cruise off and can run Wide open throttle and the engine smoothly goes from 500RPM to say 4500RPM if I choose.

The problem shows up when I stop the engine and sit a while, say drift or simply dock it with the power on, I attempt to restart the motor and it struggles to start. When it does start, It stalls at 1000 - 1200 RPM when I try to go faster. What I have had some success (it may be coincidence) with on 3 trips so far in this case is turning ALL power off, re-priming, then starting with choke, allow warm up then it goes. What could be causing this issue?

Thanks,

Robert

[rodbolt17]

is there a real reason you wont post the model number?

[Robert_FL]

rodbolt17 - I would need to look up the model number as I don't know the model number off hand.
I know it is a single engine mount - carbureted V6 2-Stroke Yamaha Outboard For that year and size, I only read about 2 motor model numbers that size and year and assume it is the rotation difference.

[rodbolt17]

model numbers get nessasary cause some folks have no clue whats really bolted on the transom and over the years many changes were made to the 225 2.6L and a few years overlapped with a both a 2.6L version and a 3.1 l version at the same time.

can lead to confusion.

if yours is actually a 2.6L 225hp made for the 1992 production run it has NO choke.
see what I am getting at.

if you actually have a 1992 the based on your description I would clean the carbs and rebuild the enrichment pump and replace both fuel lift pumps.
this only applies to the 1990-93 225 2.6L motors.

[Robert_FL]

Thanks. The only way I can choke it is pressing the key switch in while starting it. I will look at the motor more closely to get the information off it.
The marine mechanic I go to, cleaned the carbs for the second time maybe 6 months ago. He replaced the fuel pump on the motor, its a smaller one. I don't recall him stating he replaced a second one. The oil injection pump checked out fine. It could very well be the carbs, but it starts and runs very well the first time going out which is why I am confused about it being the carbs dirty again. I did notice that after he cleaned the carbs a second time I now occasionally lose my prime when the motor is at rest, could this be some of my issue? I will check on where the fuel lift pumps and ask which ones were replaced.

[rodbolt17]

you can call ripley.
you can call santa clause
you can wish on the first star you see tonight.
BUT if it is an actual 1992 225 2.6l US market motor, it simply has NO choke.
push the switch till your fingers BLEED and NOTHING happens on the motor.

the topmost pump takes fuel from the upper fuel bowl and based on various sensors on the motor applies the enrichment for starting,acceleration,decelleration and knock detect .

if that diaphragm ruptures funny things go on.
it also has two lift pumps that supply fuel to all 3 carbs.
rupture one and funky things happen.

if all is well that motor starts and idles all by itself with a simple turn of the key.
I will restate ONE more time.
the US market 1992 V6 2.6L motor had NO choke.

so you simply CANNOT choke it.

we clear on the choke now???

find a tech that can get on the way back machine and try to remember how this early micro processor/prime start engine controls worked.
that system was used from 1990-93.

the reason your keyswitch either uses a push to choke setup or the older separate toggle is simple economics.
no sense in making a different keyswitch for 1 or 2 motor lines.
eventually more and more Yamaha motors were equipped with prime start OR EFI yet still used a push to choke switch. just the blue choke wire had no affect at the engine.

[boscoe99]

you can call ripley.
you can call santa clause
you can wish on the first star you see tonight.
BUT if it is an actual 1992 225 2.6l US market motor, it simply has NO choke.
push the switch till your fingers BLEED and NOTHING happens on the motor.

I was once talking to a fellow and he swore how much better his motor started if he pushed the key switch inwards at a certain time during his starting procedure. He had a Yam EFI four stroke. I told him if pushing in on the key switch made the motor start better, then go ahead and do it. I did not want to burst his fantasy bubble.

[boscoe99]

Rodbolt, do you have a trick that you use to readily differentiate between a V76X carbureted (6 carbs) model and a non V76X carbureted model?

[Robert_FL]

I am certain it's the 90 degree V6 model with 3 twin barrel carburetors.

[boscoe99]

I am certain it's the 90 degree V6 model with 3 twin barrel carburetors.

If so, here is some information about that model from Yamaha:

Prime Start Enrichment
Additional enrichment is necessary to start a cold engine. Fuel-air mixes do not want to vaporize in a cold engine. In order to get a little fuel to
vaporize, a lot of fuel is dumped into the engine. On most V4 and V6 engines, a choke plate is used for cold starts. This plate restricts air entering the engine and increases the fuel-air ratio. The enrichment system on the 90° 225HP engines (1990 - 1995) is con*****ed by a microprocessor. The choke switch and choke valve system have been eliminated. Temperature and throttle position are monitored and enrichment is automatic. An electromagnetic valve unit with a pair of injectors with different diameters are used to provide enrichment. Timing advance is also con*****ed by the microprocessor, thus eliminating the need to advance the throttle during startup.

[99yam40]

Aint technology wonderful.
If it works properly it is

[rodbolt17]

boscoe
the only way I can tell the difference behind this monitor is if someone will post a simple model number.
after that most of its in my memory, and my tune up spec guides.

[TownsendsFJR1300]

How the heck does this manual choke cable hook up???

[rodbolt17]

it attaches through the discombobbulator plate.
if that fails, you simply need an alternator.

not to be confused with a wobbeleator plate.

[Speedcop]

it attaches through the discombobbulator plate.
if that fails, you simply need an alternator.

not to be confused with a wobbeleator plate.

Tell it to him Rodbolt!! ....I love your humor!!!!!