« previous next »
Pages: [1]   Go Down

Author Topic: washers under idle fuel mixture screws on 78 pd carbs  (Read 1679 times)

0 Members and 1 Guest are viewing this topic.

Offline yzracer2

  • Full Member
  • *
  • Posts: 16
washers under idle fuel mixture screws on 78 pd carbs
« on: January 14, 2012, 07:11:52 PM »
Hi,
Anybody know where I can get replacement washers that go under idle fuel mixture screws and above the o rings on 78 pd carbs. I am missing 1 washer. Are these important? Will the bike run well without them and the orings in there?
Thanks.
Jon
« Last Edit: January 14, 2012, 07:13:49 PM by yzracer2 »
Logged

Offline brandEn

  • Old Timer
  • ******
  • Posts: 3,205
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #1 on: January 14, 2012, 07:24:38 PM »
The washers help to keep the mixture screw from turning on the oring which could tear it. ACE has tiny washers as well as Radio Shack. Radio Shack sells them in a pack though.
Logged

Offline Danno

  • Hot Shot
  • ***
  • Posts: 715
  • 74 CB550,75 GL1000,76 KZ400,77 GL1000,73 CB750
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #2 on: January 15, 2012, 04:41:07 AM »
yes you need both the O rings and the washers
Logged
when you own a motorcycle the wife does not have to find you handy she just has to find you

Offline dakota

  • Enthusiast
  • **
  • Posts: 103
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #3 on: January 15, 2012, 04:57:11 AM »
Here you go:
Keyster K-973WA, AIR SCREW WASHERS AND SLIDE NEEDLE WASHERS
diam ex = 5.15mm
diam in  = 3.10mm
thick.     = 0.55mm
http://www.siriusconinc.com/pro-detail.php?pid=&product_id=2188
« Last Edit: January 15, 2012, 05:29:55 AM by dakota »
Logged

Offline cookindaddy

  • I sure love this bike!
  • Expert
  • ****
  • Posts: 1,153
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #4 on: January 15, 2012, 05:03:10 AM »
Thanks! I wish I'd known about those when I needed one that was missing.

They are metric and have a smaller outside diameter than the standard metric washer of that size. I tried to source from an industrial hardware supplier but they were special order and I'd have had to order 1000 pieces. I ended up asking a friend with a model lathe to make one for me.
Logged
George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

Offline Tree

  • Enthusiast
  • **
  • Posts: 142
  • CB750K5
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #5 on: January 15, 2012, 05:56:45 AM »
I was missing all four washers for a '78 750F Carbs.   Found a post where someone used number four lock washers by flattening them.  I found some yesterday at an RC airplane hobby shop.  They worked except I had to file the inside diameter with a small round file to make it a little bigger.  Seems to work fine now.
Logged

Offline yzracer2

  • Full Member
  • *
  • Posts: 16
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #6 on: January 15, 2012, 09:57:39 AM »
Thanks for the info -  I have some on order now from Sirrius
Logged

bollingball

  • Guest
Re: washers under idle fuel mixture screws on 78 pd carbs
« Reply #7 on: January 15, 2012, 12:45:44 PM »
I got mine from here they also have a 25 pack of the correct o-rings.

                                               Ken
Logged
Pages: [1]   Go Up
« previous next »