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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    The valve does not sit flat against the block. Bad valve? Just guessing, but I would think it should normally stay in a closed position. Thinking back on everything now, if he completely filled the crankcase, there would have been no place for the oil to go except through the valve, likely with...
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    It has only sat for 12 hours today after me getting it started. The plug is not carbon fouled as far as I can tell, it has some light grey deposits on it, not black, as I would expect with carbon fouling. I was going to take a look at the breather valve, too, and have run into my next problem...
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    If it was water cooled, I would agree and start looking at a blown head gasket. It does not ignite immediately, but will eventually produce a short-lived weak flame, but that could be the oil igniting, I don't know at what temperature that would start to happen. It does not show signs of boiling...
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    1. I know that the cylinder is not going to be 100% sealed. Perhaps in my "hobbyist automotive background", I should have mentioned that I've rebuilt engines before. I am familiar with how an ICE works, ring gap, and that some amount of blow-by is always going to be present. 2. I'm going to have...
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    I think it's done for. There's got to be something wrong with the cylinder somewhere in the stroke. Crankcase is full of pressure and the oil is contaminated just getting it warmed up. I still can't figure out why it would be doing that and seem to pass a leakage test. Start of compression stroke.
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    Something must be wrong in my settings, I'm not getting notifications for my post. I went ahead and got a new carb from the Amazon B&S store, hopefully it's good (crossing my fingers), but most likely this will be the last season he will be able to use it. If it is the needle just letting gas...
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    Previously, I had a carb on order from Jack's Small Engines, but after a couple of weeks of being on B/O and getting tired of taking our mower over every weekend, I ended up just getting one off Amazon. Maybe I just got a bad one, like you say. I didn't have any luck trying to disassemble/clean...
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    Is there something I'm missing? I think the oil in the intake is a blow-by problem, but what should I do about it?

    This is my first post, I have pretty much zero experience with small engine repair, so bear with me... A little backstory: This is my in-law's mower; they got it brand new at the beginning of this year's season. It's a Craftsman M320 with a Briggs engine (104M02-0223-F1). A few months ago, they...
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