Ok guys and gals I know we have talked about this numerous times. My 14 has always done it since new. Mostly when going down hill and engine breaking kicks in. I have Alba fuel controller didn’t help. Changed spark plug brands didn’t help. Thought well as the weather gets warmer it will stop. I just hate driving thru the woods with a group and people always asking what’s wrong why you backfire. Then younsay the same answer polaris says. It’s normal it’s how Polaris engineered it. I say bullcrap! What all sparkplugs you using. I am thinking of going back to crappy stock champion plug.