Shuts down at high speed.65mph and higher. Acts like it runs out of gas.
Maybe it is (sort of) running out of gas. Check no blockages to fuel tank breather that causes a vacuum in the tank and holds back the fuel flow, check the fuel filter, look for kinked lines etc. Fuel can be getting through, but just enough to idle or run slowly. Put the engine under load by riding faster and consequently increase the amount of fuel needed to run the engine faster and the "fuel starvation" effect is highlighted.
There are other possible causes of course, but the above checks don't cost anything.
on Aug 26, 2015