August 12, 2009 at 10:38 pm
#21555
Munch
Participant
sounds like a partially clogged main fuel line. Once the fuel gets low in the tank and you switch to reserve the valve switches it to another line to pull from a different side/cavity of the tank..the reserve. Not all bikes are designed this way but I have heard of this on another forum. Putting it in the reserve switch allows the clear line to draw fuel up and the overflow from the regular tank flows over in continuous feed to the reserve side.
I am not 100% sure on this as I am not a bike mechanic but redin in other forums around the net, it seems to be a common issue and solution, IF your bike is designed this way.