Hey just bought an 87 moto4 200, when I'm riding it and open it up, it tries to bog down and shut off, so I let off and ease in on the throttle it still tries to bog down,
Plus when I'm in the higher gears it shuts off on me in the middle of riding.
Any ideas?

 

The guy said it had a rebuilt carb or a new one about a month ago

 

A few of us chimed in on this thread over the years, relating to Moto 4 carb problems and solutions. Maybe this will help in your troubleshooting...

https://atvconnection.com/forums/yam...-200-carb.html