When I would fill up, the gauge would only read 3/4 full...as gas would be consumed it would start to work again as it got below 3/4. I ordered a new fuel unit set ($80) part number 37080-MCS-G00. It has a float on it and fits in the upper tank...Here is how you do it.
Siphon tank so no gas is in the upper tank...or drive it until you are at 2 bars.
Put on center stand...Take off seat.
Raise and support upper tank like you do when changing air-filter.
Look on the underneath side of the tank that you just raised...you will see it held into tank with 4 bolts....Take a picture of it.
Take off left side panel (small one just underneath seat.) 3 allen bolts. From underneath this panel you can unplug the fuel unit set.
Remove 4 bolts from the fuel unit set...carefully fish it out of tank, paying attention to how it came out.
Fish in the new one with the new o-ring that comes with it......all this took me about 2 hours...but I do stuff slow.
problem resolved...works good...hope this helps someone.
Siphon tank so no gas is in the upper tank...or drive it until you are at 2 bars.
Put on center stand...Take off seat.
Raise and support upper tank like you do when changing air-filter.
Look on the underneath side of the tank that you just raised...you will see it held into tank with 4 bolts....Take a picture of it.
Take off left side panel (small one just underneath seat.) 3 allen bolts. From underneath this panel you can unplug the fuel unit set.
Remove 4 bolts from the fuel unit set...carefully fish it out of tank, paying attention to how it came out.
Fish in the new one with the new o-ring that comes with it......all this took me about 2 hours...but I do stuff slow.
problem resolved...works good...hope this helps someone.