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Big Red fuel mixture questions.

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My '09 Big Red has started running rich, smells rich & spark plug fouls out after an hour or so of run time. I have had some fuel injection experience but need some thoughts on trouble shooting, sensors, and sensor values?

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Welcome to the site , I would guess you are from maybe Australia ???    You say you  have a 2009 Big Red , what is that ?  

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Is the air filter and intake tube clean and free from any obstructions? If your still using the factory intake system mice like to build a nest on top of the fuel tank exactly where the factory air intake is.

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You have a good thought. Last summer I did a top end, in chassis re-ring job & had the air filter area apart. All looked good and I installed a new air filter. But......I didn't look at the intake system before the filter?

 

 

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