200 hp - 2003 RPM limitor issue

[chuckmead]

I have twin 200 hp - 2003 Yamaha outboard motors.
Issue:
50 % of the time when I go to excelerate my port engine will not go above 3,000 RPM.
No Alarms and all gauges are reading correct status.
To correct the issue I have to shut down the port engine and turn key completely off, I restart the port engine and jump on the excelerator quickly and the engine performs normal. There are time I have to do this 2 or 3 times for the motor to reset to work normal.

Question:
Which components should I check or replace that will correct this issue?

[rodbolt17]

model number?
were about 6 versions of a 200 hp yamaha in o3.

[chuckmead]

Motor Model # LZ200TXRB in 2003
it is in the LZ200TXRB 2003 series

[chuckmead]

We conqured the oil pump issue on the starboard side now hopefully we can conqure the limitor issue on the Port side.
the model number is Motor Model # LZ200TXRB in 2003

[rodbolt17]

lz200txrb
left hand rotaion
HPDI
trim
25"shaft
remote control and a 2003 model run.
tells me its a single driver HPDI based on the 2.6L v6.
your description tells me you most likly have a fuel restriction.
you must measure,simultaneously, medium pressure and high pressure fuel rails at the problem RPM and load.

[chuckmead]

okay, as a reminder
The problem goes away and is corrected when I shut down the port engine and turn key completely off, I restart the port engine and jump on the excelerator quickly and the engine performs normal for over 27 miles. There are times I have to do this 2 or 3 times after idle or cruising for the motor to reset to work normal.
But if I cruise at 1500 rpm or so for a few minutes then jump up to speed it limits at 3,000 or 3,500 RPM, but not all the time
I fugured it would be another sensor telling the motor to slow down but I have been wrong on all these items so far - lol.
So we will proceed with a mechanical issue not a electrical/sensor issue.
Question:
the test needs to be done under rpm and load so I imagine I cannot do the test with a flush apperatus.
Can this test be done in an outboard tank or do we test it in the field in the water ??
I will need to read up on the test procedure and which tools/equipment I need to get.

[rodbolt17]

in the water, preferably with the laptop connected.
remember when you hit save on the laptop it grabs the last 13 minutes of operation.

[chuckmead]

Okay, its time to purchase hardware/software,
I need the pc adaptor and software,
does Yamaha outboard parts sell it?

[rodbolt17]

beats me.
I do know they are hard to get and version 2.0 has been released but is not supposed to be sold outside the dealership and will only be updated through yamahas YMBS.

[chuckmead]

Not suppose to be sold to the public - GREAT!!!!
Yamaha forgets that the customers purchase the outboards and make them money, not the mechanics, isolating the mechanics with the only source to trouble shoot a motor does not make the consumer happy.
So Yamaha theory is:
that I have to go to a Yamaha dealership, hire a mechanic and his computer and software and take them out on my boat to test the motor under a load.
They do not sell to the public - lol ,
Oh MY!
Okay, well I guess I keep resetting the motor everytime I need to go above $3000 RPM.
I guess my next set of engines will be another brand of motor.
anyways that was just me venting from frustration.
I will keep searching for a diagnostic testor of some sort.

[rodbolt17]

do some googlng.
I was on a forum that a poster had posted what and how.
and it was all avalible from radio shack.
most techs could not solve an engine issue with the puter up their .
puter says MOTOR GOOD.
sometimes ya just gotta do it old school.
means ya simply gotta understand how and why.

[chuckmead]

LoL - Old School is ripping all the sensors out and by passing them.
When you notice your motor not working well, you shut it down, It does not shut it down for you.
All I need is an alarm/light for temporature, oil pressure. oil level and Alternator.
Let me shut the motor down because of a problem, not a computer.
If you are stuck in the surfline or out in a small craft advisory in a wave breaking channel, you need the right to shut the motor down, not a computer.

Its like that new SUV that just came out.
It will not go into reverse because it sees an object behind the back bumper!!
It doesn't realize its a trailer!!

[99yam40]

Its like that new SUV that just came out.
It will not go into reverse because it sees an object behind the back bumper!!
It doesn't realize its a trailer!!

I love that one

But as Rod said there are in spec failures that you will need to check out and be able to spot as the computer does not realize it is out of whack

[rodbolt17]

old school has nothing to do with bypassing anything.
it means knowing when to use the digital meter,analog meter what I am looking for,what I expect and why that reading affects what part of the running issue.
it means haveing a complete understanding of what its supposed to do,what its doing and why.