I have a DRR-90 which starts and runs fine for a short period of time, (2minutes) upon initial startup and then once the fuel from the carb is burned it continues to run fine at idle speed but once you try to give it gas it stalls. You can continue to run at idle speed just fine but thats it. I have changed filter, completely removed all fuel lines including carb and thoroughly cleaned....To no avail! Any ideas would be greatly appreciated!I thought maybe it could be choke related?

 

It could be choke related, however I'd start with float levels and carb settings
Have you made any adjustments to the carb needle?
Is this a two or four stroke?

 

Do you still have the stock air box on?
Maybe it is trash above the needle and seat or trash floating around in the fuel bowl.

 

You have a fuel problem somewhere. You are getting enough flow to run it at idle biut not enough for anything above that.

 

I've seen petcock problems before. Maybe dirt in the petcock or something.
Just a thought