I have a Troy Bilt pressure washer with a B&S 11P902-0127-B1. It maybe has 15 hours total in it. It will not start. Won't even turn over. I have cleaned the entire fuel system and carborator. I have spark (but maybe not enough?). The kill switch tests out good. I have readjusted the magneto to a business card gap. I have tried starting fluid direct in carb (not even getting a backfire). There is no reaction at all when I pull cord. Flywheel is engaging properly. The pull is normal. Given all of this information, what else could it be? How can I check it without special tools. Please help. I have spent many hours trying to figure it out and I can't afford to take it to a pro. Thank you.