You can put a grocery bag near the intake to make sure you have good vacuum. The carb should try to suck it in. The filter shouldn't affect vacuum all but a leak past or in the carb anywhere can. It can also be a thing if your valve timing is off by a good bit. Ask me how I know lol.
edit: TIL 2 strokes don't have valves so forget that part.
edit: TIL 2 strokes don't have valves so forget that part.
