To jdm and tele - When my bike did it at the national the carbs had only been on for 3 weeks since I had completed a total cleaning and reassembly. Since the issue was a blocked main jet in my case, and since I know it didn't come through the fuel line, as such a large piece of trash would have held a needle valve off the seat and caused an overflowing carb, I'm sure my trash came from one of the vent tubes. all it takes is a bug looking for a new home, and spiders are bad at that sort of thing - SteveThat makes sense to me. I am sure spiders can make nests. I still say the filter is about as good as the OEM petcock. Thanks for the come back. JD (PS Steve if you got a hole in the diaphragm would it not give you similar symptoms?) I would like to thank you for the info you gave about a plugged main jet. It is good info and could save someone a lot of problems. I just hope I can remember it if it happen to me. Again Steve Thanks you are a good man.
I've often wondered how trash gets by the screen that is in the gas tanks. I know it isn't a total filter, but should stop mose debris. While your looking at the fuel hose for degregation, look at the petcock diaphram.
Explanation: I recently replaced the diaphram in mysons petcock. During the repair, we found that the rubber on the inside of the diaphram (gas side) was basically gone. What was there, was decomposed/grains of rubber.
So, possibly the problem people are having is the rubber from the diaphram is getting into the carbs.
But, I have another thought. Did you look at the fuel line to see if it was kinked?
When you've worked on the carbs etc, you've removed the tank. (and moved the fuel hose)
The fix you found may have been a kinked hose not a blocked jett etc.
The hose can be fine when the engine is at idle. But the kink can restrict the flow and cause insufficient fuel flow. Or, it can kink/close more as it heats up or vibrates. I ran into this problem while on a ride. On thattrip, rerouting the fuel line solved my problem.
Ride safe, Ted