Author Topic: Help needed. CB500 petcock leak  (Read 629 times)

0 Members and 1 Guest are viewing this topic.

Offline RatBikeRandy

  • Enthusiast
  • **
  • Posts: 144
  • Yes I Can
Help needed. CB500 petcock leak
« on: September 07, 2014, 10:18:20 AM »
My petcock was allowing fuel to flow in the off position.  Replaced the 4 hole rubber packing with a new Honda part and it still flows in the off position almost as much as the on position.  I'm stumped!

Everything looks OK, the spring/wave washer still looks good.  I  have it in the correct order (rubber packing, petcock lever, spring washer, outer plate).   I have tried loosening and tightening the screws that hold the outer plate but it didn't make a difference.

The only thing that I see that could be a possibility is that only 1 hole has a nipple (the one on the left).  The other 2 holes are smooth; should they have a nipple that is missing for some reason?

I can buy a new petcock if I have to but I don't understand how this could be flowing.  What if I try to bend the spring/wave washer to put more pressure on the rubber gasket?

Thanks for any help

RandyMan

Offline dave500

  • Really Old Timer ...
  • *******
  • Posts: 17,196
  • WHAT?no gravy?
Re: Help needed. CB500 petcock leak
« Reply #1 on: September 07, 2014, 12:42:43 PM »
if the main body is corroded itll never seal.

Offline Stev-o

  • Ain't no
  • Really Old Timer ...
  • *******
  • Posts: 34,897
  • Central Texas
Re: Help needed. CB500 petcock leak
« Reply #2 on: September 07, 2014, 01:48:10 PM »
I had same issue, buy a new pet cock.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........