Working over the V-11 on its winter layup doing my undertank checklist. I ordered a new breather hose and pcv valve from mgcycle. On removing the hose I did not find a pcv valve installed from the factory. Made me wonder if a pcv valve is needed on a spine frame. The bike has low miles and I dont get any oil in the airbox so no problems. Did some models have the pcv and some did not? Asking the experts.