well installed the new filter no change, hold fingers over carb or a double piece of t shirt cloth in it runs like new, remove and stalls. do these atvs need a restriction to run right??? I never heard of an engine needing an air tight filter to run???

 

Still think something's not adjusted right or blocked. Rather than just cleaning install a new carb kit and make sure all the passage ways are clean and open. You shouldn't have to block off a carb to make it run.NEW Yamaha Moto 4 YFM200 Carburetor Carb Rebuild Kit Repair 1986-1989 USA | eBay

 

I bought a new carb no change