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I'm still trying to round some corner like the correct O2 sensor position
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Here's where I put my O2 sensor. It's on an Area P exhaust mounted right between the rear end of the engine's oil pan and the UniTrak suspension linkage frame mounting point.
It seems to be the perfect place for it. Far enough down stream for temperature considerations and gas mixing from the two cylinders. Also nice that the sensor and it's wiring is protected from weather and doesn't get in the way at all.
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When you fit the bungs for the O2 sensors you may want to space them out so that only the tip is protruding into the exhaust stream so as not to make too much of a restriction of the flow
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Yes, you definitely don't want the O2 sensor protruding too far into the relatively small diameter EX-250 exhaust. I used an extended length bung to allow just the nose of the sensor to poke out into the exhaust gas flow. Works great.
