IslandRoad
Serious Thumper
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It doesn't vibrate, it purrs!
Posts: 1147
The Kiewa Valley, Australia
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The manual petcock is literally just a little door that lets the fuel out of the tank, gravity does the rest. The actual switch that controls the fuel flow is the float in the carb. As stewmills pointed out, if the float is working properly then it will shut off the fuel, when the fuel in the carb reaches the right height, and it will allow it flow again as the bike uses the fuel from the carb.
If the float malfunctions (it can stick if a bit of debris in the fuel gets caught in around the spring) then the fuel will just keep flowing until it finds its way out of the carb. That's usually out the back into the airbox and out the front into the engine. You'll probably smell the fuel before you see it.
Some guys don't bother turning it off at all. Others, like myself, have got into the habit of switching it off whenever I remove the key.
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S40, 2014, Dyna, Raptor, 52.5/152.5, spacer mod, sea level, cat-eye LED tail light, bullet style halogen turn signals, 'Superbars' with custom 40mm risers, modified stock seat, Metzeler tyres.
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