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Old 12-26-2005, 10:34 PM   #1
cross-country OP
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640 adv petcock

I was thinking about removing the main fuel petcock on my 640 and plating it off, (i have already built the block-off plate) and running the two small valves into a "Y" to the carb. Can anyone think of a reason why this would not work. I do alot of technical offroad on the bike and am worried about it being removed accidentally.
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Old 12-27-2005, 06:37 AM   #2
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If you don't mind losing your reserve standpipe, have at it.

Oh, and somes pics might be interesting as the "suddenly missing petcock" topic gets some regular play around here...
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Old 12-27-2005, 07:57 AM   #3
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Or get/make a rallye skidplate with boxes; best protection for your pet cock.
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Old 12-27-2005, 08:20 AM   #4
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I've been talking with a fellow, Chris Barnes, who is making some very nice CF tank guards. He will be making a set with an extension on the left guard to offer a degree of protection for the petcock.

I only mention this as an alternative to removing the main petcock, which at first thought sounds like a good idea... until you remember that should you run out of gas and need to open the second valve to use what remaining fuel you have... you will need to stop and get off the bike to do it.

There have been a few situations come to mind where this would be neither practical nor safe.

C
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Old 12-27-2005, 09:05 AM   #5
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I dreamt pictures too...

Just CF or is Chris Barnes using kevlar fabric as well? The banter about this type of guards has been pretty adamant about CF alone being insufficient to protect the tank (see discussion in Orange Crush). Shouldn't be that much more expensive, unless you want ballistic kevlar
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Old 12-27-2005, 09:12 AM   #6
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Losing the reserve does not bother me. I won't be losing any fuel volume, just a reminder that Im close to empty. The low fuel light that is on it gives the rider the same "reminder'' that the 950 gives, since the 950 has no reserve setting on its petcock.
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Old 12-27-2005, 10:02 AM   #7
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Do you know anyone who had theirs knocked off on a 640 Adventure? Nobody here has ever posted that they have. I think it is not worry'n about.
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Old 12-27-2005, 10:20 AM   #8
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Originally Posted by Rad
Do you know anyone who had theirs knocked off on a 640 Adventure? Nobody here has ever posted that they have. I think it is not worry'n about.
Just a couple - certainly not a common problem. One fella even put it back on with JB Weld! But it seems like an unnecessary risk, particularly for folks who travel to B.F.E.
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Old 12-27-2005, 10:25 AM   #9
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Quote:
Originally Posted by meat popsicle
Just a couple - certainly not a common problem. One fella even put it back on with JB Weld! But it seems like an unnecessary risk, particularly for folks who travel to B.F.E.
If someone really feels it is a problem, protect it, don't remove it. There is far more chance of a leaky fuel line or flood'n or leak'n carb when parked where a petcock would come in very handy. Also, trail side repairs regading removal of the tank will be even more of a problem.
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Old 12-27-2005, 11:10 AM   #10
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Quote:
Originally Posted by Rad
If someone really feels it is a problem, protect it, don't remove it. There is far more chance of a leaky fuel line or flood'n or leak'n carb when parked where a petcock would come in very handy. Also, trail side repairs regading removal of the tank will be even more of a problem.
So if this guy simply blocks off his petcock spot, then will he have to use the screw-valves on the other two fuel lines as a 'petcock'? Not sure of the physics of this stuff...
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Old 12-27-2005, 11:19 AM   #11
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Quote:
Originally Posted by meat popsicle
So if this guy simply blocks off his petcock spot, then will he have to use the screw-valves on the other two fuel lines as a 'petcock'? Not sure of the physics of this stuff...
yes
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Old 12-27-2005, 11:23 AM   #12
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Quote:
Originally Posted by meat popsicle
So if this guy simply blocks off his petcock spot, then will he have to use the screw-valves on the other two fuel lines as a 'petcock'? Not sure of the physics of this stuff...
Depends on the year, some had 1 valve and 1 petcock and some had 2 valves and 1 petcock.
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Old 12-27-2005, 11:47 AM   #13
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My 97 has two petcocks (left and right) and one screw valve (in front of the radiator). Both petcocks have reserve positions.

The 99 I just bought has one petcock (left side) and one screw valve (also in front of the radiator). The tank feels like it's got the lugs molded in for the additional right side petcock and just needs to be drilled.
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Old 12-27-2005, 12:40 PM   #14
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Originally Posted by ChrisC
yes
OK, oh one of brief wisdom... if I might clarify - why does the petcock on my bike (03 with two additional valves) shut off the gas (when the extra two valves are still open)?
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Old 12-27-2005, 01:17 PM   #15
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Quote:
Originally Posted by meat popsicle
OK, oh one of brief wisdom... if I might clarify - why does the petcock on my bike (03 with two additional valves) shut off the gas (when the extra two valves are still open)?
Why would you shut off the crossover valves unless you are removing the tank? To have a primary... and secondary "last chance" reserve?
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