Differences

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--- techtalk:evo:body02 [2022/05/17 07:42]
ixl2relax [Petcock (Fuel Outlet)]
+++ techtalk:evo:body02 [2022/05/17 08:33]
ixl2relax [Petcock (Fuel Outlet)]
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 ===== Petcock (Fuel Outlet) =====
-{{ :common:space100x5px.jpg|}}{{ :techtalk:evo:body:petcock-filter.jpg?direct&150|}}\\
+{{ :common:space100x5px.jpg?direct&2|}}{{ :techtalk:evo:body:petcock-filter.jpg?direct&400|}}\\
-The Petcock allows control of the fuel to the carburetor from the fuel tank. It has a 3-position lever to create OFF, ON & RESERVE settings. The **OFF** setting prevents fuel flow to the carb (used whenever the bike is not running). The **ON** setting allows normal fuel flow to the carb when the tank is above the reserve level. The **RESERVE** setting allows the final amount of fuel to be sent to the carb until the tank is empty. Normally, the petcock has an in-tank cylindrical mesh filter enclosing these inlets to prevent any dirt in the tank from clogging the intake of fuel. The tank and filter may be required to be cleaned from time to time. ((Pic from Carl-04XL here: http://xlforum.net/forums/showthread.php?t=359788))
+The Petcock allows control of the fuel to the carburetor from the fuel tank. It has a 3-position lever to create OFF, ON & RESERVE settings. The **OFF** setting prevents fuel flow to the carb (used whenever the bike is not running). The **ON** setting allows normal fuel flow to the carb when the tank is above the reserve level. The **RESERVE** setting allows the final amount of fuel to be sent to the carb until the tank is empty. Normally, the petcock has an in-tank cylindrical mesh filter enclosing these inlets to prevent any dirt in the tank from clogging the intake of fuel. The tank and filter may be required to be cleaned from time to time. ((Pics from Carl-04XL here: http://xlforum.net/forums/showthread.php?t=359788))
 The petcock creates two levels of fuel supply in the fuel tank, the higher level being used for the ON setting and a low level being used for the RESERVE supply level. To do this, a short tube protrudes vertically into the fuel supply to create an ON level. A shorter tube (or the base of the petcock) is used to supply fuel ONLY when the petcock is set to RESERVE. By drawing fuel from the taller tube when the petcock is set to ON, a 'reserve' is created (usually between 10% & 20% of the tank size) below that tube level so as to warn the rider that the tank is running low on fuel.
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 There are a number of Petcock valves available, most using 62169-xx, where the xx is a number and revision letter. The older versions (like 62169-81) do not use a vacuum valve. Later, among the vacuum versions (such as 62169-95/A/B/C & 62169-02/A) there were versions with a left-direction fuel outlet tube while others have a downward fuel outlet tube. Some versions have a handle where the long portion is the pointer to the mode and others use the shorter end of the handle to indicated the valve mode (as in On, Off, Res).
-**INSTALLING THE 22MM PETCOCK**\\
+**INSTALLING THE PETCOCK**\\
-These petcocks have a nut used to attache the petcock to the tank. The nut has two different sets of threads. One thread set is for the petcock (fine threads) while the other set is for the tank outlet (coarse threads). The principle here is that as you thread the nut onto the coarse threads of the tank, it is tightening faster there than the fine threads are unscrewing at the petcock. This difference in thread tpi, pulls the petcock up against the tank outlet. The in-tank filter functions as the seal between petcock and tank (or there may be an additonal washer or o-ring as a seal).
+These petcocks use a multi-threaded nut to attach the petcock to the tank. One thread set is for the petcock (fine threads) while the other set is for the tank outlet (coarse threads). The principle here is that as you thread the nut onto the coarse threads of the tank, it is tightening faster there than the fine threads are unscrewing at the petcock. This difference in thread tpi, pulls the petcock up against the tank outlet. The shoulder of the in-tank filter functions as the seal between the petcock and the tank (or there may be an additonal washer or o-ring as a seal).
-You must wind the nut down on the petcock before starting to attach the petcock to the tank. Place the petcock close to (but not against) the tank outlet. You want the nut to securely screw onto the tank threads (several threads) before the petcock is pulled tight to the tank outlet. As you thread the nut onto the tank, it is unscrewing (more slowly) from the petcock. If you start thread the nut onto the tank outlet with the petcock too far away, you will run out of threads before the petcock is pulled tight to the tank outlet. If you start with the petcock too close to the tank, the petcock will be pulled tight to the tank after only one turn of the nut onto the tank outlet. You're looking for a balance here.
+You must wind the nut down on the petcock before starting to attach the petcock to the tank. Place the petcock close to (but not against) the tank outlet. You want the nut to securely screw onto the tank threads (several threads) before the petcock is pulled tight to the tank outlet. As you thread the nut onto the tank, it is unscrewing (more slowly) from the petcock. If you start to thread the nut onto the tank outlet with the petcock too far away, you will run out of threads before the petcock is pulled tight to the tank outlet. If you start with the petcock too close to the tank, the petcock will be pulled tight to the tank after barely starting the nut onto the tank outlet. You're looking for a balance here.
 It may take a time or two of testing to see just how close you want the petcock to the tank as you start to thread the nut onto the tank outlet. Success is when the petcock is properly tight to the tank with a relative equal number of nut threads holding onto the petcock and the tank outlet.