I have recently bought a used 05 WR 450 and the previous owner had taken off the smog pump. I have heard the smog pump cuts down on power so i want to leave it off but I am having problems with loosing the rubber caps he had put on the openings left from the smog pump. I was wondering if there was a good way to cap these openings so I don't have to fix them every couple of rides. As of now I have them capped with some rubber caps held on with wire much like is done on hand grips. What works best???