Suzuki ALT 50 question

[200xman]

I finially got motivated to get my ALT 50 running, went to put the tank on and realized there were 2 nipples on the fuel valve. My question is where do the 2 hoses go? I know 1 has to go to the carb but which one? I pieced this bike together so I never saw it whole. I will be leaving off the oil tank too but I can figure how to block that off.

[phreakboy]

I am not sure if this is anything like this or not but on my us90 they ran both lines to the carb, one for reserve and one for on. Could be the same setup.

[200xman]

I probably should have added this before but the fuel valve is similar to my KFX 400. it has an on position and 2 prime positions but no off position.

[Ryah]

To disable the oil injector correctly you should disassemble the pump on the right side of the case and take out the internals. Then just put a vaccume nipple on the end of the hose barb or take the barb out and put a bolt in it's place. That's what I did and have had many trouble free years. As to the on off switch. When you turn the switch to prime it should flow out of the lower barb. That goes to the clutch. The one on the back is I beleve vacume activated like the TriZ. I have hopped up my little Suzuki, so I only use it with it in the Prime position. It seems to flow more more fuel than the on position.

[Ryah]

Here's the fuel pump. # 2 is fuel #3 is vacume line.

[dirtybiker71]

The idea behind the "prime" and "run" positions are so that the fuel will shut off automatically when the engine stops and stops producing a vaccuum signal. It is a safety device used on street bikes for years as well. This is done to eliminate the possibility of flooding over if the carb needle and seat (float valve) don't shut off and also so that, in the event of a crash, raw fuel will not keep running out of the carb overflow. (Assuming that the engine dies that is.) the valve is not really a pump, but an automatic shut off system. There is a diaphragm that has a spring pushing it closed (shutting off the fuel) on one side and the vaccuum hose is connected to the other side. When the engine starts, vaccuum pulls the diaphragm open. The "prime" position should be used if the carb is dry as there is no way to build enough vaccuum by just pulling the rope to open the fuel flow. In prime, the diaphragm shut off valve is bypassed and the tank is connected directly to the carb like a traditional fuel valve in the "on" position. This feature is left over from the suzuki moped that the ALT 50 is based on.