Its been said already but ill reiterate. The reserve tank is connected to the main tank. The F4 has no "reserve" tank in the way that if the bike dies you can move the petcock to reserve and the bike will run again. The "reserve tank" is active from the point the fuel light comes on. The petcock does NOT have a "reserve" setting as seen on some other bikes...It only has "on" "off" and "on". Basically...if the light comes on it means business and depending on riding style, gearing, etc, will dictate how far that "reserve" fuel will carry you. Hope it helps clarify things. Enjoy the ride.....

 

Ha, my warning light doesn't work. I've crossed the brown wire to the ground, no light. I've connected the two wires, and I see the circuit is active but warning light don't work. I've plugged both wires to the fuel reserve sensor half way and tested the connections, test light proved good. Taken the cluster gauge apart and it don't look like you can replace the bulb, it looks like its integrated in the circuit board (go here to view a picture of it). I am a total lost as to how to fix this problem.

 

Most people dont.....those that like to live on the edge need a reserve to switch to after they have run out of gas.

 

looking through my manual says that there is no reserve, but its good to know how far you can go with the light.