hey there, nice to know theres another person with the same bike. the "on" "res" and "prime", On is the "OFF" position. no worries about taking the tank off with it on ON. "Pri" is for Priming the carbs, say if you drain them or whatever. and you know what res is probably, when the fuel gauge gets into the red, should put it on res. My bike at 100km/h revs at 5500, 6000 for 110km/h, seems to be for every 500rpm is 10km/h. i am also wanting a smaller procket, even better gas mileage on highway driving which is what i mostly do. But it screams to 190 like nothing with the 4 into 1 yoshimura and k&n. I have been having a hard time find the filter pod K&Ns for my GS, just the k&n for the airbox is all i can get. If you find filter pods, let me know.
I have layed mine down several times and it shows it, had the front brakes lock up this year, last year i hit black ice and put her down doing 40km/h. This picture shows the side the hasn't hit the ground, both time was on the right side....

shes a tough old girl with lots of life left at 82,500 km on the odometer without a rebuild motor, never been apart. just oil changes and filter every 2000 kms. I have replaced a few stators and regulators
this picture is kinda big?!?!?!?! is screwed up the whole page i guess....