Working on a friends 2007 Rhino 660. A month ago it would start but die when given gas. Removed carb and jet was clogged, cleaned and put back in, ran great. A week later he takes it to his cabin to go ride and it does the same thing. I removed the carb and the jet was clogged again, this time with a silver silicone type material. Clean it and put it back on and now it will not start. Checked spark, looks good. Pulled the fuel line off carb and its getting gas. Any ideas?