Have a 1991 cbr1000f as a project needs a lot of work but its what I like. Have taken tank off but the gas tap worked with no vacuum hose attached as there was no hose to see either. Question is where does the hose attach the other end, cant see in the manual thanks

 

smack me I stand corrected ! someone didn't put enough water in my Robinsons Barley Water

link item 5 is the vacuum tube in question

 

Goes from rear of petcock to the inlet on your leftmost carburettor - should be a place for it to fit.
(on my bike)

 

On my '94 it goes to the vacuum port on the left side of cylinder head (where you would hook the gauge for balancing).

 

Thanks for replies, all the carbs have rubber caps for the connection of vacuum gauges for balancing so bit confused as what was done as the tap lets petrol through without the need for a vacuum pipe, will strip tap to see what is going on. Its the risk you take with a cheap project have found two reasonably biggish problems, 1, the bolt that holds coolant pipe on (the coolant pipe goes to back of head and is held in with one bolt not like other heads where coolant pipe goes to side of head with 2 bolts) back right side of the head has been snapped off so will need drilling and an easy out 2, the inlet stub of the inner right hand side of the head has about a third of it been broken off somehow but can still get the inlet rubber on and clamped. The engine is in a SC24 bike if needed will heads from other marks fit, thanks

 

Have just seen a pic of where vacuum pipe goes in some pics will check later

 

Right have had a look and do not have a vacuum take off point on engine side far left carb so still confused as to where the tap vacuum pipe comes from

 

Mk 1 carb set?

 

I think you maybe on to something there Kiwi the MK1 don't have the vacuum line going
to the petcock

 

Got in one Sprock, us lucky Mk1 owners don't need a vacuum line cos' we have one of them new-fangled electrical pump thingys to do our sucking for us.

Apparently manufactured by "The Prince of Darkness Electrical Power and Light Company"