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The float bowl vent lines are supposed to be routed under the seat where the air is more still. Float bowls, just like the gas tank, need to be vented to allow good fuel flow. Crosswinds can create fuel starvation if the vent lines are in the open.
They should be removed when you run quality pod filters and let the bowls breath easier through the vent ports. Dynojet recommends the lines be removed (stage 3 jetting kits) when running their pod filters, especially if you ride on freeways or in windy conditions. If the lines are left on while running pods, my understanding is crosswinds actually create a vortex in the lines. This creates resistance to adequate venting and fuel starvation will happen at various levels. My '79 GS 1000 with V&H pipe and K&N ovals would show obvious fuel starvation even in calm conditions with the lines attached and routed correctly. My understanding is when you increase the air intake and straighten out the flow, the stock venting design is compromised because it's no longer adequate for the increased flow. If you remove the lines, you remove as much resistance as possible and it helps avoid fuel starvation, but some degree of fuel starvation can still happen under some conditions.
They should be removed when you run quality pod filters and let the bowls breath easier through the vent ports. Dynojet recommends the lines be removed (stage 3 jetting kits) when running their pod filters, especially if you ride on freeways or in windy conditions. If the lines are left on while running pods, my understanding is crosswinds actually create a vortex in the lines. This creates resistance to adequate venting and fuel starvation will happen at various levels. My '79 GS 1000 with V&H pipe and K&N ovals would show obvious fuel starvation even in calm conditions with the lines attached and routed correctly. My understanding is when you increase the air intake and straighten out the flow, the stock venting design is compromised because it's no longer adequate for the increased flow. If you remove the lines, you remove as much resistance as possible and it helps avoid fuel starvation, but some degree of fuel starvation can still happen under some conditions.
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