Dry plugs

[Retrosteve]

carb.jpg Hello . I ve been trying to start the gs 850 but it wont run . Carbs were totally rebuilt . Ive got the tank off and running a drip feed for fuel .
If i spray easy start into the carbs the bike fires instantly . Took each spark plug out and all of them are dry with no fuel smell at all .
Its a mystery . Float bowls are full also .
Also where does this connect to ?

[Rich82GS750TZ]

I believe your pic is of carb # 2? We number cabs/cylinders 1 2 3 4 left to right (as you sit on the bike). So that port on the front of carb # 2 gets a hose to the smaller nipple on the petcock and provides the vacuum. With the tank off and feeding the carbs with a bottle, you need to cap that port.

[tom203]

Apply full “choke” and use no throttle during cranking

[Retrosteve]

Thanks that's helpful. I'll plug the port and give it full choke to see what happens then report back.

[rphillips]

Not just choke, the "no throttle" is just as important.

[Retrosteve]

Will do. This will be a first start in many many years

[Retrosteve]

Evening all , still no joy . Bike fires then dies .....
Still dry plugs . All 4 float bowls are full so from the carb to the cylinders something is stopping fuel getting there ?
Ive just read that running a fuel filter affects the fuel flow ? I have a filter inline.

Do the air flow ( vent) pipes need to vent openly because mine are joined with a T piece .