when you removed your spark arrester did you put the bolts back in the exhaust.If not there is a retainer ring in there that will work loss and block exhaust flow. You will need to cut off the end of the pipe gut it and reweld it. Take the pipe off and shake it listen for a rattle. If there is no rattle your pipe should be ok then you sould do a valve adjustment exhaust valve may not be opening as it should. hope this helps
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