Hey guys I'm new to this suite and I have a few quick questions.. My 2000 WR400F doesn't have a air cleaner box cover, is this an issue? Also when I start the bike the only way I have good throttle response its if the cold start is on. When it is off, it sounds like a lag when I roll the throttle. I'm thinking about taking the carb out and cleaning it. Any help would be great.