I have a buyang 300 it bogs down like it sputters and the rpm fluctuate I put a new carb in a couple days ago and it worked for a couple days now it is doing the same thing I put supreme gas in my buyang is that maybe the problem

 

Are both the air and fuel filters new as well?

 

The fuel filter is about 2 months old but the air filter is maybe old it's the factory one in 2012 but I seen it had oil in bottom

 

I would say you might be answering with the oil in the air filter. I would replace the fuel and air filter.

Pull your spark plug and report back the condition. Oily, black soot or normal. Pics help too.

Is this a 2 or 4 stroke?

 

It's 4 stroke so I took out my air filter and rode it and it was fine and sorry oil wasn't in air filter there is some below air filter




Oil in bottom of air filter<br/>

 

It is a 4 stroke and I took out air filter and drove fine but oil is not in air filter it's below air filter

 

Confused on the #5 post. After taking out the filter, it is now running fine?

 

It was working as soon as warmed up to three bars it started sputtering again any ideas

 

Did you pull the spark plug and see the condition as asked?

 

Sorry I thought I put that it has black soot on it