Old thread, but I'm experiencing the same problems- super frustrating- Toomey T-5c open air box 280 jet, tores eliminator,performed a carb synchronization they were both dead on, then pulled carbs off, cleaned and disassembled both, (stock carbs) replaced both fuel valves, and set the float height to 20-22 mm... Replaced the fuel, new airfilter, and yet, the Right over flow line from the Right carb is pissing fuel, flooding the bike, and boom- no start- it does run for about a min. But once that bowl fills up with fuel, it's the end of story- anyone have any advice? Is anybody here close to the 5boros? Thinking about purchasing new floats all together, but could use some expert advice