Rode yesterday and had a backfire and sputter in the higher rpm's. Would start up and idle fine an everything else seems fine good power and all but had these issues. Rode it last weekend on a local lake and not one single problem, this time it was a little colder and pretty muddy. I just changed the plug today and it looked good, nice cardboard tan. I have a no toil filter that I just washed and is drying now. Could it be the colder weather leaning it out or is my carb dirty? When i drained the carb the drain screw had some gel on it. It was around 20 or so degrees out.