I'm getting conflicting input on valve adjustment on a new 1300. One group says you MUST check the lash because you're risking burning a valve if the lash is too low (valve not closing all the way.) Others say don't worry because carbon buildup, seat expansion and cam/lifter wear all go towards increasing lash which means less power but no burned valves (valve opens late and closes early.) What do the forum members say? I don't want to have to it if it's not necessary. What did yall find when you checked them? Thanks, guys.