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2004 Yamaha 225hp Engine Idles And Sputters After Getting Warm

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2004 Yamaha 225hp Engine Idles And Sputters After Getting Warm

Old 06-10-2021, 04:59 PM
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Default 2004 Yamaha 225hp Engine Idles And Sputters After Getting Warm

Hello - All of our mechanics in the area are 6-8 weeks before they can even look at an engine. So, I’m attempting this on my own and, while fairly handy, I have never worked on an engine before. This engine is new to me so I have no proof of prior maintenance.

The Engine: 2004 Yamaha VX225TLRC OX266 3.1

The Problem - Idles very rough after running for several minutes. Once warm, it will start but occasionally die when I put it into gear.

My Research: Bought the Clymer Online Only Manual, talked to friends, searched Google, the forums and YouTube.

What I Replaced Based on the Above:

1. All 6 plugs were oil fowled and not correct for this year model. I replaced them all (used NGK 6993).

2. Cleaned O2 sensor. Did not look like it had ever been cleaned. Very dirty. Got pretty clean and re-installed.

3. Replaced all 3 LP fuel pumps. These pressure tested ok. My buddy said replace them anyway.

4. Replaced fuel filter.

5. Replaced Primer Bulb. When I vacuum tested from outboard side it slowly leaked.

6. Compression Tested all 6 cylinders: 4 at 100, 1 at 102 and 1 at 92.

Any suggestions on other things to try would be greatly appreciated.
Old 06-10-2021, 05:52 PM
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Drain and replace the gear case oil, and oil filter.

Drain and replace the crank case oil.

In addition to the external fuel filter, replace the internal fuel filter as well.

Drain, remove and clean out the VST.

When you replace the primer bulb replace the fuel lines from the fuel filter the to bulb, and bulb to the engine hook up as well.

Remove, clean and check the anti-siphon valve. Consider replacing it.

Remove the pick-up line in the fuel tank, and clean the filter.

Check and clean the carburetor.

Check the manifold for any blockage.

Old 06-11-2021, 05:40 AM
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Will it reach the rated RPM when opened up? I have 2 OX66 and have never been able to clean and get a o2 sensor back to life. When done they are done. There are a few ways to test them and do a search. Did you pull out the tube that goes to the O2 sensor its called a joint. They clog. you will have to remove the box the o2 sensor is installed in. Its easy. I just replaced both mine with automotive sensors. They were 40 bucks vs the crazy price Yamaha has the balls to ask for them.
If your plugs are all fouled check the oil linking for adjustment. They come set really rich and lean it out. Mine are not to the pin but about .015 off and hardly any smoke.
Your compression is getting lower than normal but it could be your gauge is off. I have had issues with coils going bad and they are easy to check and your manual should give you the ohms for the primary's and secondary's and the spark plug caps have resisters in them and they can go bad. They unscrew.
I had rough idling and a sneeze stall during warmup and I just had my injectors cleaned and they are like new engines.
Old 06-11-2021, 06:18 AM
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Default Thank You

Thank you very much. I’ll get to work on these items this weekend.

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