Hi. I've just installed a high flow air filter into my Sinnis max, I also bought a bigger main jet but I ordered the wrong one so I wasn't able to fit it. The bike runs fine but I would immagine that the fuel to air mixture is rather lean now and what worrys me is I've heard that this can cause damage to the engine if it runs too lean, is this true? Also when I accelerate I get this fairly loud roar which I assume is comming from the new air filter, is that normal?