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Re: Upgrading from NGK BPR9ES from BPR6ES.
I remember a friend of mine switching to 9's and seeing nothing good (pretty much identical set up as yours). I also went to an 8 for a bit, but my fuel was loading up, and I was shooting 3ft. flames out my exhaust. If ya have access to all of them, why not try going colder and see what works best?
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