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2 of the hoses coming from the "octy" to the petcocks supply fuel but why the 2 "vacuum" hoses also going to the petcocks? what do they do? thanks
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There are 2 fuel lines on each of the special petcocks. Only 1 vacuum line, and that goes to the octy.Nathan
KD9ARL
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1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore Roosevelt -
If you have vacuum hoses going to the petcocks you either have a standard tank on there or you have vacuum lines hooked to fuel outlets. On the special petcocks there is an regular outlet at the rear and a prime outlet on the front on each side. They are both the same size.
How about a picture of what your talking about?Last edited by BA80; 10-25-2013, 06:15 PM.Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
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you just answered my question. both of my petcocks have on, off, reserve, and prime. now I understand that those other 2 hoses provide fuel when in prime position. now I get it. thanks.Comment
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Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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thanks again for the info and the diagram of the fuel hoses. i'd like to buy a spare rubber vacuum valve inside my octy assembly but I can't find a part number anywhere. partzilla shows only the complete assembly. any clues? thanksComment
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If you get a petcock rebuild kit for the specials it usually comes with the octy diaphragm as well.Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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Greg
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”
― Albert Einstein
80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.
The list changes.Comment
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thanks again for the helpComment
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Keep in mind that a leaking vacuum fuel valve is usually caused by a bad seat or o'ring. Make sure you get that seat smooth as a baby's bottom.Marty (in Mississippi)
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