1990 Suzuki King quad BST31SS question

[Mleo]

I’m trying to repair rodent hose damage to my  1990 king quad 250. Several hoses to the carb were destroyed. I’m going to replace them. The manual doesn’t provide a layout or description of what they do or where the hoses go. Does anyone know where I can find that info?

[Mech]

The manuals do normally have a diagram showing the hose and cable routeing. Are you looking in a genuine suzuki manual or something like Clymer/haines ?

Failing that, does it have a manual fuel tap or an automatic one controlled by vacuum ? How many hose fittings does it have on the carby ? Does it have any emission control systems on it ? Does the carby have a diaphragm on top, or does the throttle cable go straight into the top of the carby ?

[Mleo]

Thanks for replying. Good question about the manual. It's a Clymer. The carb has 3 hoses I can see with a diaphragm on top. There is a small aluminum Mikuni component with 3 hoses attached. It's about 2.5x1.5x.5 inches. One hose goes to the fuel petcock, 1 to what I think is the engine vacuum and the other to the carb? The fuel pump maybe?

I'll see if I can find a genuine service manual. Do you know where to find one?

Edited January 25, 2022 by Mleo

[Mech]

They have manuals in here, under "downloads". In my collection of manuals your year doesn't show a hose routeing plan, but in the later model manuals(which have the same systems) it does, so perhaps get a later model manual.

Ok, so I'm presuming your throttle cable goes to the left side of the carby. On that model there's one hose fitting on the left rear, that's the fuel pipe. The fuel pipe comes from the fuel pump which is under the front fender on the left side. The fuel pump has three hoses, one at the rear comes from the fuel tap, the front feeds fuel to the carbies left rear, and on the flat side facing the center of the bike there's a vacuum hose. That vacuum hose goes to the carby on the right front, but since you have a vacuum operated fuel tap it goes to the carby via a three way junction. The third junction goes to the fuel tap.  On the carby at the right rear there is a hose fitting, that's the carby vent pipe and it goes up under the range selector panel. At the end of that pipe it quite often has a three way junction fitting.. but nothing goes on the other two branches. I think it's just so it can't get blocked so easily.

There are two other model carbies that I know of so if that doesn't sound right let me know and I'll run through the other models.

All the hoses need to be thick walled. If you go to an auto shop they may sell you thin walled vacuum hose.. It doesn't do, ask for fuel hose of the size you need.

 

The small component you describe, it's either the fuel pump, or part of an emission control, but, if I'm reading your model number right you are in Africa ? And I doubt it has emission controls. If it's not the fuel pump, post a picture and we will see if we can identify it.

[Mech]

https://www.manualslib.com/s/suzuki+atv.html