how can i fix brute500 powerwasher2200psi?

how can i fix my brigg stratten power washer500brutemodel#020300 2200 ps1last used it work fine went to start it no go . seems to have good spark,but dosnt fire correctly and you can see a flash rite were the butterfly valve is when it dose fire . i took carb and tank off looked ok but still get a flash near butterfly on out side of carb.

gerald carlson
August 2011