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One line that comes from the top LH side of carb (looking at carb w/o air cleaner) is a carb vent aprox 1/4 " hose. It connects only to the carb & hangs in a wire bracket as a vent tube. The 1/2 " vent line that goes from the valve cover on the rear cylinder goes to the spigot on the air cleaner case & vents the crankcase gases back into the intake of the carb to be burnt. Those are the only 2 lines other than the fuel line that comes from the metal pipe that crosses over to the fuel pump on the other side of bike. That fuel line connects to the carb metal fuel spigot on the side of the carb. That's fuel into carb.
If you're not getting fuel to the carb, then the vacuum line you're talking about comes from the backside of your carb and feeds vacuum to both the VOES switch and the vacuum operated petcock. The VOES is either up in the tunnel of the fuel tank or on the choke cable bracket. The nipple for the vacuum line on the petcock is on the backside of the petcock. The nipple for the vacuum line at the carb or intake should be visible is you look at the backside of the carb from the left side of the bike.
The big one is the gas line which goes to the petcock.
The smaller one is a vacuum line which also goes to the petcock.
That is a vacuum operated petcock, which works off the vacumm off the intake side of the carb.
the intake side is the engine side, the other side of the carb is airbox side.
There should be a nipple sticking out of the carb on top on the intake side.
If not then the nipple is on the intake boot itself, on top.
The intake boots are on the engine side of the carb and the airbox boots are the opposite side.
The '82 Yamaha Vision only has one fuel line coming from the carb to the petcock and a vacuum line running from the petcock to the front carb manifold. An in-line fuel filter between the carb and petcock is reccomended...
hi there are two possabilites to this one ,it could be a redundant pipe feed to the airbox that you probably dont have now as youve got a chop and well airboxes look awful leave it as it is or it could be your carbs came off a much later bike that had the vacuum fuel tap fitted and this has been left open which should be capped off try sealing it off with a blocked piece of rubber pipe suitable size
if it runs a lot better blocked off theres your answer cheers
there should only 2 lines from the fuel tap, one for fuel, and the other for vacume, the smaller diameter hose is the vacume, and the larger hose is fuel. fuel hose will go to carby, and the vacume hose to the carby inlet manifold.
put air cleaner back in the airbox as it is needed to create proper vacuum.blowing pressurized air into the openings on the carb could cause the float needle valve to stick to the seat.make sure your control cables are not in a bind, make sure fuel flows to the carb with pressure from pump (not just gravity feed)
Small bore pipe from inlet side of no 2 carb goes to the small bore pipe on the petrol tap (this is the vacume swich pipe)
Large bore reinforced pipe goes from the large pipe on the petrol tap to the (hidden and bugger to get at) connector that points up (on the airbox side) between no's 2 & 3 carbs on the airbox
A large bore pipe goes from the rear facing connector on top of the centre cover on top of the cam cover (located under the frame beneath the petrol tank) to the connectot on the air box (this is the breather pipe) Ensure that all pipes are hole/split free, secured with clips and that each inlet mainfold rubber (between the carb and cylinder block) has it's vacume plug fitted (located at the bottom of each rubber)