2000 Yamaha 225 2-stroke

[Seastrike]

I have an issue I bought this boat last year in June and had no problems until about the 10th trip out. It started just cutting out at random and I had no idea what was up because lets face I am not a boat mechanic. Problem persisted only at random. Going up on plane, after being on plane for 5 minutes etc... I changed my fuel water separator, fuel filter, and all spark plugs. Which seemed to help then it started doing it again. I never really figured it out but now. When I tried to bring it out for the first time this year it acts like its mis firing and doesn't want to stay running. I drained fuel thinking that might be the problem but still no go. Any replies on what it might be would be greatly appreciated.

Thanks

 

[cousinabe]

Re: 2000 Yamaha 225 2-stroke

post the full model number located on the port bracket.
If it's an ox66 model it might be a clogged vst

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

The motor is a 2000 Yamaha v-225 OX66 2-stroke Saltwater series II. The only numbers I found are (SX225TURY) underneath those numbers I found (62J U 200632) I'm not sure which ones you needed. Also whats a VST exactly? I read a thread last night where you and rodbolt were thinking that the O2 SENSOR was the problem with some different guys boat that had similar issues to mine. Thanks for the post I look forward to getting some more info.

 

[cousinabe]

Re: 2000 Yamaha 225 2-stroke

here's a link to a VST filter change, although it's from an HPDI motor, yours is similar.
http://bbcboards.zeroforum.com/zerothread/66928

You should clean the VST screen every 100hrs.
Sometimes, you can unscrew that brass plug and spray some carb cleaner in there... bend the carb clean tube up 90 degrees and spray to the left side.

I recommend taking it apart and cleaning it out though.

Not knowing what preventative maint has been done, I would look into:
1) replace low pressure fuel pumps
2) replace/clean VST screen and o-ring.
3) clean pressure regulator screen on VST.
4) clean fuel injector screens
5) clean/test O2 sensor for proper output voltage.
6) replace water pump
7) replace engine filter and water separator filter.
8) inspect/clean out popit valve; PRV.
9) link and synch and set TPS.
10) replace thermostats.
11) check that resistance of spark plug caps are in spec.
12) properly adjust the oil linkage rod.
13) clean filter on remote oil tank.

All of this can be found in the service manual

 

[rodbolt]

Re: 2000 Yamaha 225 2-stroke

I am liking cousinabe more and more.
just wish he would clean up my typo's.
but yep, what cousin says is a very good starting point.
look in most yamaha marine tech guides for the past 4 years and there is a troubleshooting chart.
follow that chart and at the last page your engine will be fixed.

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

First thanks for all the info, Secondly today I took off the O2 SENSOR and it had some nasty black stuff all over it and in the housing of it. The local marine shop said it is carbon build up and I can either clean it and hope its still good or replace it. Since it is $325 and special order, you guessed it I am going to clean it. I took it off and have it sitting in Yamaha Combustion Chamber Cleaner like the guy at the shop told me to overnight, So we will see what it looks like tomorrow... As for the rest of the things you said I should do, I guess I will have to go ahead and get started on that. But, do you think that the O2 SENSOR could be the sole source of my problems? Or is it that combined with other issues that caused it to build up the carbon in the first place?

Thanks again

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

I completed cleaning the O2 SENSOR and put it back on tonight and cranked it up and it ran great for about 5 seconds and then went back to the same old routine of running like crap. I'm about to clean the VST FILTER and see where that gets me....

 

[scjmc]

Re: 2000 Yamaha 225 2-stroke

I had a problem that seemed like a fuel delivery issue. It turned out to be the VST filter. I cleaned it and I was good to go.

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

I just cleaned the VST FILTER and guess what. It wasn't dirty! But, I cleaned it anyway since I was already in there. I still have a boat that runs like crap and I am almost ready to give in and take it to a shop. Thats if I had the money. I am going to go clean the FUEL INJECTOR SCREENS and see where that gets me....

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

I took off my fuel rail so i could clean my FUEL INJECTOR SCREENS but I could not find any screens. I am feeling quite discouraged at the moment. Anyways the BOAT is still not running correctly and I am fairly certain it is well beyond my tinkerings. So I will default to bringing it to a local marine shop and see where that gets me.... Thanks for all the advice. I will let ya'll know what the outcome is....

 

[cousinabe]

Re: 2000 Yamaha 225 2-stroke

explain cutting out. please provide more details.
maybe you have poor ground connections or a clogged pickup in your fuel tank.

btw, the fuel injector screens are pressed into the injectors. you can see the green fitting in the injector. i used a pair of pliers and gently twisted them out, sprayed with carb cleaner and pushed them back in.

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

When I said cutting out I meant that it went from running perfectly fine to like someone hit the kill switch and it would just shut down and it would crank right back up no problems. Mind you that was last summer this is now. Now the problem has gotten more serious or may'be its a different problem all together. About a month ago I took it out and was idling out of the harbor and I got it up on plane and all was well for about 15 seconds and it cut out and when I tried cranking it back up it continued to die on me so I had to crank it and put it in gear and it would die and limped my way back to the harbor.Back at the house on freshwater its running extremely rich, smoking like a bug truck, sounds like its missing, and shaking back and forth violently. I tried giving it more throttle thinking it may clear itself out but it still has all the same symptoms that I just listed.

Thanks for posting back cousin

I will go out there and take off the fuel injectors and try and clean those screens, since I now know what to look for. Thanks again.

 

[cousinabe]

Re: 2000 Yamaha 225 2-stroke

I would check to make sure your battery and ground cables are clean and tight.
Also, check out this post. A similar cut out issue related to the fuel injector relay.

http://forums.iboats.com/showthread.php?t=310079

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

I took off the fuel injector rail and the screens are clean. Go figure right. I tested the 02 sensor and it didn't ever reach .03 volts it acctually stayed at .02 volts and never changed during the whole test. I also disconnected it and it still ran like crap. I am going to a local shop to have them test it. I am fairly certain I found my problem. I will update you guys when I put the new $325 one in Thanks for all the posts guys......

 

[cousinabe]

Re: 2000 Yamaha 225 2-stroke

if you're certain it's the O2 sensor, www.boats.net has them for $250.59. Don't forget to clean out the draw tube and change the gaskets.
Part #41
http://www.boats.net/parts/search/Yamaha/Outboard/2000/SX225TXRY/ELECTRICAL 3/parts.html

 

[luckyer]

Re: 2000 Yamaha 225 2-stroke

Let's not forget the anti syphon valve. I had that happen to me a while back; best $20 I ever spent., (After a week of trying everything else)

Lucky

 

[cousinabe]

Re: 2000 Yamaha 225 2-stroke

I gotta say, I don't think a faulty O2 sensor is gonna cause your engine to just die like that, but I could be wrong.

Before spending all that money for an O2 sensor, I would do some further testing/troubleshooting.

Try with an auxiliary fuel supply of fresh gas.
Check the fuel pressure in the VST when problem occurs. Must maintain 35psi.
Check ground connections.
Check the FI relay. Do you always hear the pump turn on for a few sseconds when you turn the key?

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

The O2 SENSOR is GOOD and that makes me happy and mad all at the same time!!! Back to the drawing board!!!!! The pump sounds like it stays on once you turn the key. What is the anti syphon valve and where is it located? I put the 02 SENSOR back in and took of the 3 lp fuel pumps and checked the fuel diaphragms and they are all intact. I think I am going to take the BOAT to a shop at least to have them diagnose the problem so I can fix it....

 

[luckyer]

Re: 2000 Yamaha 225 2-stroke

Anti syphon valve is located at the top of the tank, it is actually the fitting with a spring loaded valve that your main fuel line connects to the tank with. It prevents a siphon from happening if you spring a leak in the line, resulting in a bilge full of fuel. It is similar to a spring loaded Automotive PCV valve, the fuel pump pulls open the spring with a little vacumn, allowing fuel to continue to flow. 1-2 in of vacumn if I remember correctly.

At idle enough fuel flows. AT WOT, or a load, it does not open enough if it is broken, clogged, or galled, motor dies from lack of fuel. You stop, restart, motor runs great...take off again...just to repeat the madness, again and again. Sound familair?

Please do not take a shortcut and punch out the fitting as this can lead to a major disaster, if you spring a leak. (I had that happen too on a 15 gallon built in tank with too long of a fitting hose on a Fish-n-ski...it was below full tank level and leaked into the bildge....)

Mine was a simple change out. I guess the vibration over the years caused it to malfunction. Steel ball in an aluminum housing? Or I could blame it on ethanol, as everything these days is incorrectly blamed on it.

My main clue was that when my motor died and I tried to pump my bulb, it would stay compressed. I thought it was a clogged pickup, but after pulling it out an seeing it did not have a screen, I had an AH HA moment. $20 at West Marine for an Anti syphon...done...

But then I blew reverse on the lower unit a few months later....a totally different story.

An easy attempt to isolate would be to a portable tank to see if the promblem continues, as mentioned earlier. If the problem goes away with a portable tank, look for the Anti-syphon or another fuel/vacumn leak pre bulb. If it continues, look at the motor/loose connections, vacumn leaks post bulb. (I had a spin on fuel filter leak air one time because the previous gasket was stuck on the filter housing, it leaked air in, not fuel out !)

I am not a mechanic, just learned alot from trial and error and alot of mistakes.

My suggestion, if the boat tank is older than 10 years old, (Why 10...that is how old mine was) change it, as some of the stories I have read, this part is the mother in law of boats. It raises it's ugly head at the worst time.

What is 50 cents a year to have it not go out?

Good luck,

Lucky

 

[Seastrike]

Re: 2000 Yamaha 225 2-stroke

Well, guys its finally over. I feel kinda stupid actually.I took the lp fuel pumps of again to make sure I didn't miss anything and realized that there is two diaphragms one on the front and one on the back of the pump and the first time I pulled them off I didn't check the back. But, this time I did and there she was two of them had huge holes in them, obviously being my problem. Long story made short the BOAT is running like a champ now and I appreciate all the help! And a special thanks goes out to COUSINABE for putting up with me! I am so glad I didn't take it to shop I have a feeling I saved myself a good bit of $moolah$. Anyways I just wanted to let you guys know this thread is over and the BOAT is running well.