rebuild petcock on a 97 SE


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furnacedoc
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1997 1500SE gold wing

rebuild petcock on a 97 SE

Postby furnacedoc » Wed Nov 06, 2013 5:44 pm



Hello , Looking for info on how to rebuild the fuel petcock, and if there are any special do or don't does that I should know before starting. I picked up a kit online. Thanks in advance for any tips or help. see ya on the road



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trike lady
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1983 GL650I SilverWing Interstate

Re: rebuild petcock on a 97 SE

Postby trike lady » Wed Nov 06, 2013 6:40 pm

When I had rebuilt one I had a clean work area to prevent foreign matter from being entrapped in the unit.
I made sure both halves were clean and the mating surfaces clean and I used the new hardware that came with the kit.
I.M.B.B.A. Technician II Certified

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WingAdmin
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Re: rebuild petcock on a 97 SE

Postby WingAdmin » Wed Nov 06, 2013 10:49 pm

Big Bike Parts published this video showing the installation of their kit. They leave out a few steps, but it's more or less complete:




furnacedoc
Posts: 192
Joined: Sat Mar 27, 2010 7:32 pm
Location: wakarusa,in
Motorcycle: 1981 suzuki GS850
1997 1500SE gold wing

Re: rebuild petcock on a 97 SE

Postby furnacedoc » Fri Nov 08, 2013 4:27 pm

thanks for the help, will do this in the next couple of weeks.

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WingAdmin
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Re: rebuild petcock on a 97 SE

Postby WingAdmin » Sat Nov 09, 2013 10:26 pm

Looks like I need to do this myself. I pulled the vacuum line off my petcock today with the bike running, to let it empty the carbs...and 20 minutes later, despite lots of revving, it was still running just fine. Apparently my petcock is stuck on!

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ct1500
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Re: rebuild petcock on a 97 SE

Postby ct1500 » Sat Nov 09, 2013 11:20 pm

Contrary to popular belief that is normal WA. Fuel pump pressure will overcome spring pressure of petcock. I have worked on a number of 15's and they all exhibit the same.

Think of it in these terms such as a run out of fuel situation or first started at factory after building. Fuel pump pressure must overcome spring pressure of petcock to prime carbs for starting in a dry scenario. Honda did not have a flunky at the end of assembly line applying vacuum to petcock for starting and neither did all the guys who ran out of fuel on the road. And there is not enough vacuum generated during cranking to completely open valve. Petcock will only completely close when engine stopped and vacuum removed to prevent siphoning.

If you were to have driven the bike with hose removed during highway driving or high fuel demands of acceleration at higher flows you will notice bogging of the engine due to fuel starvation, valve partially open due to normal fuel pump pressure of about 2 psi. :) With me it was speeds above 70.
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WingAdmin
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Re: rebuild petcock on a 97 SE

Postby WingAdmin » Tue Nov 12, 2013 12:49 pm

ct1500 wrote:Contrary to popular belief that is normal WA. Fuel pump pressure will overcome spring pressure of petcock. I have worked on a number of 15's and they all exhibit the same.

Think of it in these terms such as a run out of fuel situation or first started at factory after building. Fuel pump pressure must overcome spring pressure of petcock to prime carbs for starting in a dry scenario. Honda did not have a flunky at the end of assembly line applying vacuum to petcock for starting and neither did all the guys who ran out of fuel on the road. And there is not enough vacuum generated during cranking to completely open valve. Petcock will only completely close when engine stopped and vacuum removed to prevent siphoning.

If you were to have driven the bike with hose removed during highway driving or high fuel demands of acceleration at higher flows you will notice bogging of the engine due to fuel starvation, valve partially open due to normal fuel pump pressure of about 2 psi. :) With me it was speeds above 70.


Interesting. I know on my wife's PC800, there was a crack in the vacuum line leading to the petcock, and the bike would barely idle. You started it up, it would run the pump, fill the carbs, then run for about a minute until it ran out of gas.




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