Quote:
Originally Posted by anthonyb
Besides the valve seals (which need to be done if they are fouling the plugs), check for vacuum leaks around the breather hoses by lightly spraying them with carb or air cleaner while the engine is running.
Also might want to remove the idle control valve and clean it out (it can hold a lot of gunk and start to stick). Applying 12V to the leads (although a 9V battery works as well) will move the valve and help with the cleaning.
Can also try depressing the air flow plate and spraying air cleaning under/around the plate arm towards the engine, to try to clean gunk off the air flow meter.
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1 qt. oil per 1000 miles oil consumption should not foul the plugs. This consumption indicates that replacement of seals would be a good idea but not abselutely necessary (it is considered more or less normal for this engine, I hear... even the users manual says so).
So you should look for rich mixture.
If it is on all plugs, it is common for all cylinders.
I had a faulty EHA (Electohydraulic Actuator), which caused way too rich mixture and eventually no starting (and fouling plugs as you say). You may have the same problem.