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Hey everyone. I am in need of a new right petcock, I'm done trying to rebuild this thing. Is there a way I can rig it to be operational without needing the diaphragm? I remember seeing a way to do it, but I can find the thread. So for the time being before I find a new petcock I was just wanting to rig this so I can ride.
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'78E -
So, you want basically ON and OFF?
Okay, ON is prime and will flow with or with out vac, but no reserve.
In order to get an OFF then you need to be able to rotate the handle to the up vertical position. There's a little metal tab on the cover plate that you can grind/file off to get the petcock to rotate a full 360deg.
I think you could just take the diaphram out of it and it'll work for prime, on, and reserve, but I'm not sure about that.Hi, my name is George & I'm a twisty addict!
80G (Green paint(PO idea))
The Green Monster
K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
Got him in '04.
bald tire & borrowing parts
80SG (Black w/red emblems & calipers)
Scarlet
K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
Got her in '11
Ready for the twisties!
81H (previously CPMaynard's)
Hugo
Full Venturer, Indigo Blue with B/W painted tank.
Cold weather ride -
'79 XS11 F
Stock except K&N
'79 XS11 SF
Stock, no title.
'84 Chevy K-10 "Big Blue"
GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws
"What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~Comment
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Well I have already done that, after reading my fist post i should have explained what I meant better. Let me describe the issue and see if anyone knows what is going on with this thing. When I have the fuel line from the 1&2 carbs going to the left petcock, and 3&4 going to the right, the 3&4 cylinders fire hot and lack power. If i switch sides for each carb T to the other petcocks, it seems to run correct. More power and quicker reaction upon twisting the throttle ( like the way the bike should be). Anyone know whats going on with this thing? Also I was wondering about the idea of just using one petcock to supply the four carbs. How should I correctly route the fuel lines. Also with the problem I described, which petcock do you think I should use to supply the fuel. What should I do with the vacuum lines that run from the cylinder to the petcocks? Sorry I am losing my mind over this, I just want to ride. It also doesnt help that my car is going under surgery and I wont have a vehicle unless I get this thing going correctly.So, you want basically ON and OFF?
Okay, ON is prime and will flow with or with out vac, but no reserve.
In order to get an OFF then you need to be able to rotate the handle to the up vertical position. There's a little metal tab on the cover plate that you can grind/file off to get the petcock to rotate a full 360deg.'78EComment
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If it works one way but not the other then my bet is is on a kinked fuel line when you cross the lines.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 RooseveltComment
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Brian,
For your consideration, the vacuum petcock is a safety device. When the engine stops running, the fuel flow stops immediately. In my opinion, it was a good idea. I have another old Yam that I've owned for 29 years and the petcock has never given me any trouble.
If you're interested, the following link has foolproof rebuild instructions.
http://xjbikes.com/Forums/viewtopic/t=25058.htmlMarty (in Mississippi)
XS1100SG
XS650SK
XS650SH
XS650G
XS6502F
XS650EComment
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