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what is the diameter of the fuel petcock port on the gas tank for an 81 cx500? i have a cx tank and had to improvise a fuel petcock but now i'm trying to find the correct one for the tank.
 

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what is the diameter of the fuel petcock port on the gas tank for an 81 cx500? i have a cx tank and had to improvise a fuel petcock but now i'm trying to find the correct one for the tank.
im pretty sure.....

Manual petcocks are 14mm and vacuum are 18mm
 
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