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O2 sensor placement?

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Hi everybody! I want to ask you if it's ok to tune in line engine with one lambda placed at header pipe of one (let's say first) cylinder?

I think you know the answer.

I'ts better than nothing. But why don't you put a new bung in the collector?

Its about motorbike tuning, and sometimes its too close from the collector to the end of exhaust so fresh air comes into and gives false lean readings

I only experience that at low RPM, and you can easily work around that by restricting the exhaust a bit (like with your hand).

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