First off check the carburetor float bowl and fuel cap drain. If all is okay there, the next thing to look at is the fuel delivery. Disconnect the fuel pipe and run another pipe into a jug. Start the engine and the crimp the vacuum pipe shut. This will have the effect of opening the fuel tap diaphragm and leaving it open so you can observe how well the fuel is flowing. As a side note, is the fuel fresh?
Lately we have been experiencing a number of problems with water absorption in the fuel.
Hi, Sounds like the classic blocked fuel tank vent, try running it with the tank cap not quite closed.
Good luck!
I agree with Radnoc, it has all the symptoms of a vacuum in the fuel tank. You say that you checked the breather hose? Maybe you should look at it again.
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I have a 1998 Honda Hornet 600 that will ride fine for a period of time before it starts to feel slightly underpowered, then dies on me. It sometimes sounds like it’s running on two cylinders.
When you wait for about five to 10 minutes it allows you to start and ride it again.
I think it’s a fuel issue but I’m a bit stuck on where to attack it. So far I have replaced the fuel tap diaphragms and filter and the vacuum pipe to the manifold and checked the breather hose. I cannot seem to simulate the fault when the motorcycle is stationary.