4/23/2024 0 Comments Yamaha mt 07 ecu flash![]() ![]() The P-Y9N21-S2 page says Stock Airbox and OEM Air Filter Air Flow: 94.20 CFM and DNA Air Filter Air Flow: 145.80 CFM. The Stage 2 air filter replaces the top and inlet pipes. I also checked out DNA's website cos they do two air filters for this bike. The nearest equivalent speaker enclosure design is a bass reflex but 3 ports in that would sum to 1 not work as 3 different ones as I think they do in an airbox - this video gives an explanation - skip to about 5mins in to see visuals of resonance. 10,600rpm is 265Hz, so the box is experiencing a frequency range similar to a woofer, with three resonant frequencies. The firing order is, I think, every 240 degrees, so induction will be the same, and that's a regularly spaced pulse for a normal sounding 30Hz. For a 4-stroke there's an induction every second revolution so that's 10 inductions per second, and for a triple, that's 30 per second. The lowest idle speed is 1200rpm, so divide by 60 for seconds (so we can get Hz) and that's 20 revolutions of the crank per second. I did some maths on the frequencies - maybe someone can check it for me as my brain is rather old. or even share their experience of changing the airbox. I am trying to understand this very cool airbox - hoping someone will step in and correct me. Even my mechanic buddy remarked that it sounded like it was idling and running healthier after I got it tuned.Thanks for the kind words. His tune fixed a lot of the quirks and qualms that I had with a factory tuned 2021, and has made it an overall pleasure to ride. I highly doubt anything will happen to the bike, and like I said, your service department will most likely not care, especially if you make the job of submitting the claim easy by not making modifications apparent.Īnd seriously, Dave/VCycleNut is the best in the business. You're more than likely going to be fine, especially if you get in good with your local service department. Places like my local dealer, they're just like you and I, looking to eek out what they can for a little more fun, and they won't say $hit to Yamaha, especially if in regards to Point 2, there is no giveaway that something on the bike has been tweaked. If its a super by the book dealer, they most likely will.
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