To John's GTS part 1: Overview
part 2: Frame and hub steering
part 3: Fueltank modification
part 4: Electrical
part 6: Givi Monorack
part 7: Exhaust system modification
Compared to other bikes filling up the fueltank takes several minutes extra of
your time. But you can fix that problem!
Because of the small hole in the filler neck and the flap under that hole, it is difficult for air/vapour to escape out of the tank. The small hole was made for the smaller fillersystems for plumb free gasoline. Nowadays allmost every gasstation only sells plumbfree gasoline. The restriction is no longer needed.
So I first removed the flap for a better filling up time. It become a littlebit better but not fast enough. After a visit to Kelly's GTS pages, I decided to do the better trick too.
Pictures are taken from the left side of the tank with the gaspump removed.
Empty the tank and remove it from the bike. Remove the fuellevel gauge and
gaspump. Make sure that all gas and vapour is out of the tank.
Mount a plastic bag inside the tank around the filler neck on the tank ceiling
with ductape. Then use a Dremel (or lookalike) to cut the neck away. Most of
the metal and sand pieces are catched by the bag.
Compare the difference! Now there is space enough for the vapour to escape. It is also possible to fill up the tank to it's maximum. Once, during a Bunbunner Gold rally, I did filled up the tank with 21,16 liter. And the engine was still running. According Yamaha it's only a 20 liter tank.
The gold collored connection tube was welded on the tank for pumping gas into the main tank from an extra fuel cell. You can also see gasoline resistent epoxy around the tube connectors to repair a little leak after the welding job and as rust preventer. The hole of the connection pipe of the vent tube on the tank is drilled a littlebit bigger.
After the cutting job the tank must be cleaned. The plastic bag did catch most
of the metal and stone pieces. The leftovers in the tank were removed by
special static dusttowels.... well,.. my son did that job because his hands
were the right size. But I guess it is still possibel that there are some metal
in the tank. To catch them I mounted on the bottom (outside of the tank), next
to the drainplug, two magnets with Ductape. Don't know if that works but it
gives me a better feeling.
I also removed the oneway valve in the vent tube that gives air to the tank while driving put prevents leakage of gasoline when the bikes lays down on one side. It's located on the right side of the tank.