1999 Yamaha S200 RPM's bounce up and down passed idle speed

[CaptainSteve75]

Just recently bought a boat, came with a 1999 200hp Saltwater series (S200TXRX)...and the dam engine is not working properly...Figure that.

Currently the engine on idle sound like a champ.

When I take off on idle...No problem...nice and smooth.

As soon as I accelerate, it picks up speed for about 2-3 seconds, and then the engine starts to bounce the RPM's up and down.

When I attempt to continue like this...the engines RPMs start to bounce up and down maintaining a speed from 4 to 7 mph max.

Then I have tried to give it full throttle it sound and feels like, it is going to launch us right out of the water for about 2-3 seconds...WOO HOO...then it drops and if kept completely open...it bogs out and feels like it is going to shut off.

So this is what I have done so far to attemp to remedy the problem:

1. Review and clean (Air Compressor) all gas lines from tank to Carbs.

2. Replaced Primer Bulb and Water Separator.

Then ran it again...same thing...maybe a tad bit better.

3. Rebuilt (Yamaha kit) and Clean Carbs (Air Compressor and Carb Solution). Used all specification per Seloc Repair manual, Float Height, Air Mix Screw, etc.

Then ran it again...speed now increased to a whooping 7 to 11 mph, but Rpm, once passed idle speed...starts to bounce up and down again...opening up a little better, but basically the same.

Almost seems like it is jumping in and out of safe mode (Guessing)

Thanks in advance with any suggestion to this matter.

 

[cousinabe]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

have you checked the lp fuel pumps?

you can T in a pressure gauge between the lp fuel pump and the engine mounted filter.
should be around 3"hg. more and there is a restriction, less is a lp fuel pump problem.

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Thanks for the quick response...Change it still the same...anything I can check and/or change...I don't think the previous owner did any maintenance or updating to the serviceable parts.

I was looking into the manual a bit more and they mention Thermo's can be bad and or no oil into cylinders...which can make you run in a fail safe mode (basically idle only)...

Oil pump good...

If I were to change thermo's do I need to reset the system...there is a red switch on back does that have some thing to do with?

 

[99yam40]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

have you tested the alarm system to see if it works?
How have you tested the oil pump to be able to say it is good?
If you keep running a motor with oil or fuel problems it will eat major parts

You can use a inductive timing light to see if the timing is being retarded or jumping around and it may show you if you are loosing spark on different cylinders.

Do like cousinabe told you and make sure you do not have a fuel supply problem

 

[cousinabe]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

let's clear things up and get on the same page. talk rpms' not mph.
is the motor not going past 2000 rpms and shuttering? if so, this is fail safe mode and you need to correct the problem. do you have yamaha gauges? what indicators is it showing, whats flashing,etc.
oil level, oil transfer and overheat can cause fail safe mode.

fyi, i change my tstats and water pump every 100hrs and my fuel pumps every three years all as preventative maint items.

you can download the owners manual here.
http://www.yamaha-motor.com/outboard/service/viewmanuals/outboard_manuals.aspx

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Sorry Cheif, for not being clear...I have no gauges...

Other responses:

Oil is feeding...in addition for safety precautions, I am running 50:1 from gas tank.

Alarm was disconnected

Fuel supply: lines are clear, new fuel pumps, carbs rebuilt, new water filter...reviewed from tank and used aux tank to test as well.

 

[99yam40]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Borrow, rent, or buy test equipment for troubleshooting, you can throw parts at the motor but that gets expensive and frustrating especially if they are not needed.
Check like the manuals says and fix what is broke.
Hook the alarm back up and see what is setting it off if it is going off.

 

[Home Cookin']

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

If it was a smaller motor I'd also suspect your gas tank vent. Are you running through your built-in tank, or a portable? Maybe something similar is going on to restrict fuel flow, but you've covered a lot of the trouble spots.

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Ran both to cancel out my doubts about the on board gas tank...

I have an old school snap-on timing gun but don't know how to use it on a boat engine. Any Suggestion?

Nothing on the manual about the red switch on the back of motor.

Manual does say to swap out thermo's every hundred hours...Pumps every 600...I am just changing the minimal stuff...without knowing the history and no gauges...so far with thermo's I am under 500...I just want a fresh start.

I look foward to thank you all soon for all you help and support.

If anybody has suggestion (youtube Vid) for timing let me know.

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Could not find anything on a PRV (Pressure Relief Valve) or AKA Poppet for Yamaha...

Still trying to find out what the ____ is the toggle switch covered in red located on the back attach to the CDI Unit on back purpose.

 

[basstracker219]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

the fuel pumps might not be pumping enough fuel.

 

[cousinabe]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Pressure Control Valve/Poppit/PRV #21. Make sure there is no debris in it.
http://www.boats.net/parts/search/Yamaha/Outboard/1999/S200TXRX/CYLINDER CRANKCASE 2/parts.html

As a fresh start, I would
1) replace both tstats #8 plus gaskets.
2) replace water pump with entire kit. #18
http://www.boats.net/parts/search/Yamaha/Outboard/1999/S200TXRX/REPAIR KIT 2/parts.html
3) Fuel pumps (done).
4) Spark plugs.
5) Change lower unit gear oil.
6) Link and Sync.

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

OK...This is what I did so far:

As a fresh start, I would
1) replace both tstats #8 plus gaskets. ***Done***
2) replace water pump with entire kit. #18 ***Done***
http://www.boats.net/parts/search/Yamaha/Outboard/1999/S200TXRX/REPAIR KIT 2/parts.html
3) Fuel pumps (done). ***Done***
4) Spark plugs. ***Done***
5) Change lower unit gear oil. ***Done***
6) Link and Sync. ***?***
7) Poppet or PRV***Done***
What does link mean?

Took it out today Sat. 20th 3/2010 after installing the above mentioned. Symptoms have gotton better...but still not running faster than idle.

Watch the Vid:
http://www.youtube.com/watch?v=RhECQvyJylQ

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

OK...This is what I did so far:

As a fresh start, I would
1) replace both tstats #8 plus gaskets. ***Done***
2) replace water pump with entire kit. #18 ***Done***
http://www.boats.net/parts/search/Yamaha/Outboard/1999/S200TXRX/REPAIR KIT 2/parts.html
3) Fuel pumps (done). ***Done***
4) Spark plugs. ***Done***
5) Change lower unit gear oil. ***Done***
6) Link and Sync. ***?***
7) Poppet or PRV***Done***
What does link mean?

Took it out today Sat. 20th 3/2010 after installing the above mentioned. Symptoms have gotton better...but still not running faster than idle.

Watch the Vid:
http://www.youtube.com/watch?v=RhECQvyJylQ

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

The actual heat senors were tested and by-passed to rule out the heat sensors were working properly or not...

The first step was to disconect the pink and black lead to see, still did the samething.

Second, I conected the pink and black lead samething and the buzzer did not go off...Strange?

Tested the buzzer and it worked but not doing its job!!!...I assuming it is not properly connected.

The only thing that I can come up with is the engine fell in to safe mode due to oil sensors intially and is not responding to any to the heat switches when testing, that the only thing I have not checked on.

Any suggestion? Please look at the video help me resolve this issue.

YouTube - http://www.youtube.com/watch?v=RhECQvyJylQ

 

[rodbolt]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

do some forum searching on precision blend.
lots of info posted.
second fix the alarm circuits.
the engine WILL go into RPM reduction regaurdless of the horn sounding.
that red switch,originally was gray, is for manual oil transfer.
test spark, test compression.
do a forum search for a home made spark tester.
check the crank position sensor output voltage.
lose that and it dumps two cylinders.
lose a pulser coil and it dumps 4 cylinders.
have you removed,dissasembled and cleaned the carbs?
thats a dirt simple engie to test but it will REQUIRE some special test equipment.
do you have a digital voltmeter AND the DVA adapter?
I will be in Volvo school the rest of the week so I dont know if I will have access to a puter, sucks being a Yamaha master tech but still have to deal with sterndrives.
but quit the splatter gun method, find what works what doesnt and simply fix the non working issues.

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

Can't leaving this post hanging, It has been about two weeks of testing after work and banging my head up against this unit...But lots of fun.

Ok recap, I have collectively taken all your responses and used them to troubleshoot and repair the motor...without you guys I would of been lost...THANK YOU>

The chain of events that occur are as follows

1. Clean and rebuilt carbs with kit...New Spark Plugs...New Mech. Thermostats.
2. Tested Motor using portable tank with fresh gas. No issues with boat Gas Line, Bulb, fuel filter, and water separator.
3. Resistance test (engine off, Ambient temp of 68-70 degrees) was conducted and all results were in range per manual, Thermo switches, Thermometer, Oil Float sw 1, 2, and 3, CPS (gap fixed), Both sides of Pulser out of top and bottom of CDI, Lighting coil, Stator, Rectifier, Ignition coil.
4. Spark (Blue strong) and compression test within range per manual.
5. Wiring Followed every wire from components to CDI from CDI to Wire Harness to ensure proper connection. Found couple of wire loose not making proper contact and repaired them.

Issue at hand when engine reaches above 2500 - 3000 RPMs the engine starts to surge http://www.youtube.com/watch?v=RhECQvyJylQ

It goes up to 5000 rpms then down to 3000 then down to 1000 and back up to 3000 with remote at WOT.

The power is there...but there is definitely something that is holding it back...Some of you mention something about lose the pulser coil and it dumps 4 cylinders...Is there some kind of dianostic tool I can use to further troubleshoot this problem.

Also I have not done any load test while the enigine is running I was hoping I can find a dianostic tool. My guess is that one of the pulsers is on its way out.

 

[CaptainSteve75]

Re: 1999 Yamaha S200 RPM's bounce up and down passed idle speed

My apologies for the splatter gun approach:

Thank you all for your support...all the above information has brought me closer and closer to solving my problem.

Again, I greatly appreciate the infomation.

I have countinued this problem on another post, narrowing it down to a more specific problem. If you are interested in following tune into:

Motor Still Surging @ Revolutions Above 3000 RPM's

By:

CaptainSteve75

This Post has ended...