fuel tanks plural

Here are some pictures of my new fuel tank set up. The primary purpose was not to have more fuel capacity, but to lower the centre of gravity. I have heavy springs on the front and rear but run no preload on the rear and have sucked the forks up in the triples as far as I can. This helps with the inseam challenge. I also have a left hand rear brake set up. The lower tank holds 1.7L and the underseat 2.8L. Fuel from the left side of the main tank fills the underseat and the bottom tank. The bottom tank has no vent and purges any air in it up into the underseat tank when filling. The bottom tank is reserve and if it is called upon then I must squeezeball it up to the right side main tank, which tees off to the carby. The level of the fuel of the original 9L capacity rests at the top of the lower tank shroud hole, effectively removing a top heavy fuel load. Total capacity, 13.5L.

MC is off a chinese pitbike and is not quite upside down. It is slightly wedged so that it is not parallel with the bars and tilted down so that the slightly bent brake lever converges at the handlebar at the same height as slightly shortened the clutch lever. The brake lever has a sleeve on it to make it tilt up. I tried heating and bending several levers and most of them snapped in the vice, so I sleeved it.
The three rubber donuts keep my hand spaced so that I can use the two levers perfectly. only once in 15 months have I groped at fresh air with my right foot. It has become as natural as a bicycle. The key is the distance apart of the perches and the upward bent brake lever; it took some frigging but now its perfect. I wouldn't go back and it was cheap. A steel hose goes around the steering stem crossing to the left above the head to avoid the rear of the new fuel tank and straight down to the caliper. Forefinger clutches all day and I can lock it up anytime on dirt with the other three fingers with ease. Emergency braking: grab everything.

There is also a photo of the rear tank fixing, using the chain roller bolt into a tab provided. The guy who fabricated it builds aluminium boats. I mocked it up from polystyrene and he told me to go to the aluminium shop and get some 100x75 box section and some 100x30mm section and 200 bucks later shes done.

the 100x75mm is 3mm thick, the 100x30mm section is 2mm and the plate up the back and roof is 5mm

Here are some pictures of the actual tank

I have made some changes to the fuel arrangement of my 'Berg. I found when caning it up some hills if there was insufficient "head of fuel" she would starve, so I decided to fit a mini pump. However, on reflection I realized the shortcomings of this (such as not having any direct gravity feed to the refill the fuel bowl after a jet change) and realized it was smarter to use the left tap than the right tap to go direct to the carby, since it is at the rear of the tank and would have the greatest load of fuel on it when going up hills. The squeezeball is capable of moving about 2 liters of fuel in about 30 quick plunges from the lower or underseat tank up to the left tank to keep it adequately full. The COG of this bike, along with my new seat/handlebar set-up is superb (Check "fuel tanks plural" in the handling/suspension forum)

Anyone looking for an underseat tank for an '00-08 berg there's a black one on ebay.com right now 7/april/2012 for US$50