Measuring Oring's on Carb

AustinS · Post by **AustinS** » Mon Feb 23, 2009 6:37 pm

Does anyone know how to measure orings so I can order some? I have a 1985 Honda Elite 80 and I need two orings that go between carb and engine mount.

Using my caliper I measure the width of one edge to be about 2 millimeters. It's hard ot measure the diameter because the oring is flexible but according to my caliper it is just at 25mm.

Here is the issue.

The width from side to side and the depth are different. I assume this is because it has been squished in there for 24 years.

Here is a little picture to help you understand.

My options from Babbitts Sports are

O-RING (20.6X1.9) (Honda Code 1100585)
O-RING (21.9X2) (NOK) (Honda Code 1915339)
O-RING (22X2) (ARAI) (Honda Code 1915321)
O-RING (18X1.9) (Honda Code 1176700)

I also have a service manual. Maybe I should check there first. I'll edit if I find anything in service manual.

forewheelerdude · Post by **forewheelerdude** » Mon Feb 23, 2009 8:51 pm

go to any hardware store and they should have oring sets where you can buy like 20 different sizes of orings, open it up and compare your oring while in the store just to be sure you have the right size

AustinS · Post by **AustinS** » Mon Feb 23, 2009 9:18 pm

I did that and the auto parts store I went too had about 50 different sizes and nothing fit right. They were to fat and usually a hair to small.

I've figured out exactly what size I need 20.6MM inner diameter and 1.9mm width. I've found the part on two honda sites but the shipping costs are $15 and $17 which I refuse to pay for a $2 part.

Does anyone know where I could find this with cheap usps shipping?

forewheelerdude · Post by **forewheelerdude** » Mon Feb 23, 2009 9:21 pm

i think i used an agricultural oring set that worked for mine

Kenny_McCormic · Post by **Kenny_McCormic** » Mon Feb 23, 2009 10:30 pm

Orings on this application are a close enough sort of th9ing, something a hair large will work fine.

Clivester · Post by **Clivester** » Wed Feb 25, 2009 9:16 pm

The o-rings are metric spec so I think its almost certainly a 20mm x 2mm thick o-ring.

Give these guys a call and ask if they stock that size and will ship - Viton is the preferred material.

O-Rings West, Inc.

Phone 1-888-722-2602

Or you could take a chance that these 2.5mm will fit. They are cheap and you could offer ones you don't use to forum members for nominal fee:

http://cgi.ebay.com/HPI-75072-O-RING-P2 ... .m20.l1116