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If you you turn it clockwise as far as it will go it will be in the reserve position. Anti-clockwise as far as it will go is the on position.

Halfway between the two is the off position.

All this presuming of course that you have the stock petcock.

[img]http://www.harley-davidson-hangout.com/forum/attachments/hdrcgb-twin-cam-tc88-tc96/17470d1344529044-tc88-fuel-tap-fuel-supply-valve.jpg[/img]

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13y ago

What else can I help you with?