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Author Topic: o-ring size  (Read 677 times)

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Offline yellowjacket

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o-ring size
« on: November 17, 2015, 08:37:30 AM »
Just starting a rebuild on a 1974 CB550 carb.  The o-rings on the main jets are toast and I am sure the ones on the emulsion tubes will be as well. What are the size of these o-rings. Thanks
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Offline flybox1

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Re: o-ring size
« Reply #1 on: November 17, 2015, 08:48:09 AM »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline yellowjacket

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Re: o-ring size
« Reply #2 on: November 17, 2015, 12:42:26 PM »
Thanks that really helped a lot.  Was able to purchase enough O-rings for the rest of my life for less then the cost of one carb kit.  Here is the link.
http://www.theoringstore.com/index.php?main_page=index&zenid=e1d58e41b4dea70a650dcb604760ad94
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Offline flybox1

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Re: o-ring size
« Reply #3 on: November 17, 2015, 12:44:54 PM »
Hope you ordered  Buna-N or Viton.
Those are the only ones rated for gas.  Viton just has a higher temp tolerance
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline yellowjacket

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Re: o-ring size
« Reply #4 on: November 17, 2015, 12:50:48 PM »
Did order Buna-N. 
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