94 Yamaha 225TXRS Throttle problems

[bori2020]

The boat was sitting for a few months. It starts right up and idles great. I took it out and it would not go over 1500rpm's. I stopped and check the fuel and water separator and it had water. It went up to 4500rpm's and shut off and started misfiring. Every time it shuts off it starts right up but when I try to floor it or go past 1500rpms it dies. Could it be water in my tank? If so what can I use to fix the problem without having to take out the 90gallons of fuel in it. The fuel has Yamaha RingFree in it.

 

[yamamarinetech40]

Re: 94 Yamaha 225TXRS Throttle problems

Ringfree is NOT a fuel stabilizer, it removes carbon from engine internals....you have to remove the water from tank, engines don't run too good on water...if you keep trying to run this motor on this stuff, you won't have a motor(all of a sudden like, POW)....you need to pull the carbs and have them cleaned by someone who knows better than to 'spray clean' them, have to be disassembled and cleaned, rebuilt(just a kit), and put back together....it isn't as bad as it sounds....the water is on bottom of tank and pickup picks up from bottom of tank, just pump into barrel(suitable steel) while tilting boat at end of water to get it all, when you just get gas, stop and run for a little, then empty fuel water seperator every hr of operation till water gone....oh yeah, you can add stabil AFTER bulk of water is out, it can only make gas absorb so much water....

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

Thanks for your reply I install the kit to the carb. it was dirty I put everything back together I'm using a 5 gallon container whit new fuel and stabil start good but the RPM are to high 1200 I try to adjust the throttle but no change and the alarm start to sound I let the engine run like for 5 min before the alarm start

 

[yamamarinetech40]

Re: 94 Yamaha 225TXRS Throttle problems

Ok, if the carb was gunked up and someone adjusted idle, now it needs to be idled back down...are you running on hose? These engines tend to get hot on hose if above 800 RPM...need to put in water and find out if it'll rev up now, you don't mention if that problem went away....do you know where the idle set screw is? Also, I would perform a lync & sync...if you don't know how, buy a book for this engine. Screwing with the carbs on a two stroke and not knowing what you're doing can lead to sudden death of engine.

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

Hi thanks for all yours reply and help.
yes I'm running with hose, the problems with the rpm always revup good in neutral the problem is in the water in gear but now am waiting till saturday for drop the boat and tested after the clean carb and fuel tank hope is good now. I know were the idle screw is but I try to adjust and nothing but I find out the problem I install one of the rod accel. lever upside down I flip the other way and good rpm between 700 and 800 and no alarm , you think I still need to do the sync.... and about draining the fuel tank I can reused some of the 90 gallons... and then what you recommend for keep the gas good and out of moisture only stabil and keep the tank full or what... Thanks

Sorry about my writing I try the best.

 

[yamamarinetech40]

Re: 94 Yamaha 225TXRS Throttle problems

ok, don't know the condition of the fuel...pay attention to smell, some people can and some can't smell new/old gas....once you put it in water you can decide if you need to sync/lync....BUT...on a two stroke if it doesn't take throttle well, DON'T give it more throttle than it responds to(or keep trying) because if it's lean, it's burning hotter PLUS not getting oil(with the gas) to that cylinder....equals ruined piston....and yeah, the symptoms of revving with no load and bogging under load is classic dirty carb, so you should be on right track...good luck. Oh, i would run stabil but you might think about 'shocking' this old motor with RINGFREE(Yamaha product) or POWERTUNE(Mercury product), both excellent, I actually prefer PowerTune....follow directions and remember to change/or clean your plugs AFTER the treatment/running not before...

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

I rebuild all the carbs with the kit fire up right away when get warm shut off. I notice the electric pump is on all the time only when I turn the key on and when the engine is running I disconnect the red connector for the pump and now the engine continue running I plug in back with the engine running and the engine shut off. What that pump due? I have another concern how I know if the oil injection pump is working correctly if I check the spark plug they suppose to be a little wet or ....

sorry for this stu.... question is my first outboard I'm trying to get this guy running by the way I check compression and is like this, that is ok?
2=113 1=115
4=115 3=113
6=113 5=115

Thank's

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

By the way some one have the electric wiring schematic for this engine 1994 225TXRS serial # 700176 I found the blue wire from the choke cut close to the engine starboard side and I'm trying to check why the prime pump stay on all the time I need to disconnect the red plug when the engine is warm that way the engine stay working. Any advise?

Thanks

 

[rodbolt]

Re: 94 Yamaha 225TXRS Throttle problems

225TXRS
the X indicates its a 25" shaft motor but more importantly here it indicates its a 3.1L V76 carbed motor.
as for the electric pump its supposed to run anytime the key is on.
after the carb cleaning you need to correctly sync the throttles,oil pump rod and TPS voltage.
the pump supplies fuel to the six ECU controled solinoids the ECU can alter the fuel mix based on signals from the TPS,thermosensor and the knock detect sensor.
the oiling system supplies oil aft of the carbs into the reed box area.
however like you have been advised a lean out can burn a piston.
if the engine wont run with the primer pump running then most likly you lost or damaged the solinoid Orings and its flooding now.
that engine is prime start so there is NO choke.

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

Is a 3.1L V76 I put new o-rings to the solinoids I take the boat for a test drive today and no luck don't go more than 1400rpm the same thing than before I did the sync to the carbs and oil injection like the book said. the tps voltage is .497 I thing that is pretty close . RPM in Idle is around 750 It run with the primer pump running but sound like is starving with gas.
My conclusion is then the knock sensor or thermo sensor probably are not sending the correct signal to the ECU or the solinoids are bad. I now the tps is working good I check ohms and voltage with the multimeter with the bar and is working wright never skip the bar. I can't find nothing in the book I have is a seloc 1701 about the silinoid how to tested you thing you have some ohm chart. Again this is my conclusion you are the expert you tell me what I need to do or check. I almost forget what I need to do for know if I'm running lean.

Thanks, every help go to be very appreciate.

 

[rodbolt]

Re: 94 Yamaha 225TXRS Throttle problems

if its running lean at low speed it will cough or sneeze.
sounds like your describing a lack of fuel.
did you test the low pressure pumps?
did you carefully dissasemble and clean all six carbs?
did you test compression and spark before starting the repair?
if you suspect the CPS,knock sensor or CTS then you will need the yamaha manual and a working knowledge of electronics and a multimeter.
or use the diagnostic test lamp to check for any codes set by the ECU.
not much other way around it.

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

I don't test the low pressure pumps yet
I did with very careful the carburators
compression test as fallow:

2=113 psi 1=115 psi
4=115 psi 3=113 psi
6=113 psi 5=115 psi

TPS working good per book
I just check thermo sensor working good per book
I just check knock sensor read .553Mohms
I check all the solinoids valve in omhs as fallows:

2=38.22 ohm 1=38.20 ohm
4=39.79 ohm 3=38.13 ohm
6=38.45 ohm 5=38.23 ohm

I don't now if this values are ok I don't have the yamaha manual. were I can get that?
How I can check for codes? were is the code connector?

Thanks

 

[bori2020]

Re: 94 Yamaha 225TXRS Throttle problems

I check vacuum test read 1Hg, no bubbles on clear hose I install new fuel pumps just in case because I opened and have corrosion inside in 2 of them. Any other advise. I'm all ready frustrate.

somebody please HELP.

 

[rodbolt]

Re: 94 Yamaha 225TXRS Throttle problems

we are trying to help, however your splatter gunning it.
what I would suggest is using the FACTORY manual to go back and start over.
check spark for proper intensity, check the plug caps,test compression again.
I use a Kv tester to inspect secondary ign voltage and it also gives me an indication of spark plug firing/fouling.
go back through the carbs, double check everything paying carefull attention to the high speed circuits and the enrichment solinoid orings.
the only good test for the knock sensor is the bench test for voltage, but the best test is to run the engine with the diagnostic test lamp installed.
if the ECU sees something out of range it will set a code and blink the lamp. lamp will only blink when a code is active and WILL NOT store it for later retrivel.
I am very sorry it takes some test equipment and some training but if you wish to fix it yourself YOU have to start buying the same stuff the rest of us did.
claen the carbs and flush the engine fuel system again then run it on a seperate tank containing KNOWN fresh fuel.
ring free simply aids in keeping carbon deposits down, it has NO stabilizing nor water absorption properties.