Fuel Screen O-Ring

DeRider

Member
Can anyone provide me with the size of the o-ring that is in the fuel screen cap on the right side of the carburetor, KO- 1977. I've checked several sources and none have the actual size listed other than 23mm o.d. Not sure if there is a specific thickness. CHP is out of stock and unsure when would be restocked and was hoping I could get same from NAPA or other auto supply. Also curious if anyone knows the o-ring size for the intake on a 1978 carb.
Thanks Rich
 

kirrbby

Well-Known Member
The fuel screen oring size is out there. I could find it for you a little later.

The 78 intake...I'd just measure the OD, and the ID from your carb and heat spacer...then subtract those 2 dimensions to find the thickness of the oring... Should work??
 

red69

Well-Known Member
Fuel screen cap cross section on that o-ring is approximately 2.13 mm measuring a used o-ring. I looked at McMaster-Carr and the O-Ring Store and could not find an exact size of 2.1 mm X 18.6 mm. I would go with Allen's links.
 

kirrbby

Well-Known Member
From a Honda HK1 parts list book. Fuel screen 18.6x 2.4

Intake (in case anyone wants to know) 24x2.4

IMG_20190626_204223777.jpg
 

DeRider

Member
Thanks for all the responses. I'll try some auto parts stores tomorrow and if no luck I'll hit up DrAtv. Pat, all is well.
Thanks Again Rich
 

kirrbby

Well-Known Member
Pictured above, in #7, is a HK1 carb...1971. That shows you the orings for the K0-77 fuel screen and such. I was asking about the 78 carb because my Climers manual shows that a 78 CT70 has a pb36a carb. That would be a good clue to find the oring size for the 78 carb/intake. And good general info for the board. If the carb is a REAL Keihin, there will be some numbers/letters stamped somewhere.
 

DeRider

Member
Kirrbby, As posted by Allenp42 above, DrAtv has the O-ring for the intake flange. It requires a 27 x 2.0. I had no luck at auto parts stores so DrAtv received my business this evening.
Thanks Everyone Rich
 
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