Well on mine and I'm sure yours would be the same. You'll need to pull the jets out and clean them. The pilot and main jet have some extra holes that need cleaning and can easily clog up. I did the same as you with the same result, which is why I tore it completely down. Runs great now. I just used a new jet kit instead of trying to clean mine. Kit was like $20 and comes with all you need.
1998 Prairie 400 AWD---SOLD
2013 XMR 650---NEW RIDE
On the lookout for a Brute at a good price. Minor work needed is ok if the price is right!