Author Topic: Aftermarket carburetor o-rings  (Read 224 times)

Offline Luca

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Aftermarket carburetor o-rings
« on: May 25, 2020, 02:20:09 PM »
I recently rebuilt my carbs.  I got the bowl/enrichener gaskets from the local dealership (diaphragms/floats/needles had already been replaced), but I couldn't bring myself to spend $3 a pop on some tiny little o rings from BMW.

I used Anton Largiader's site to size my o-rings.  Unfortunately his sizing of the main jet holder is a little bit off.  I would recommend a 2mm x 8mm o-ring for that application.  I had to scare something up out of a kit I had in the garage for those, which I wasn't happy about because it didn't list the rubber type or hardness (durometer rating).

Nevertheless, you can get enough O-rings to rebuild your carbs 20 times (not including throttle shafts) for about $20 including shipping.  I chose Buna-N o rings at 70 durometer.

Enrichener 1.5mm x 5mm
Idle jet/pilot screw 1.78 x 2.9mm
Main jet holder 2mm x 8mm

I purchased them from theoringstore.com.  I have no affiliation; they just have a good selection and the prices are reasonable.  Also, you know exactly what you're getting as far as rubber type, size, and hardness, which is important for this application.
« Last Edit: May 25, 2020, 02:24:21 PM by Luca »

Offline wilcom

  • Posts: 1485
Re: Aftermarket carburetor o-rings
« Reply #1 on: May 25, 2020, 02:40:03 PM »
Quote
Enrichener 1.5mm x 5mm
Idle jet/pilot screw 1.78 x 2.9mm
Main jet holder 2mm x 8mm

I purchased them from theoringstore.com.

 Very good info, Luca. Thanks for posting
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
1982 BMW R65LS 
past:
1979 R65
1980 R65
1982 R80RT
1974 R90/6
1972 R75
1964 R50/2
19xx R27
ZX-11

Offline BPT

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Re: Aftermarket carburetor o-rings
« Reply #2 on: May 26, 2020, 01:29:53 PM »
Yeah, thanks for doing the legwork and posting this Luca.  This is good to know.
1983 R65 w/ Velorex 562 Sidecar

Offline Barry

  • Posts: 5014
Re: Aftermarket carburetor o-rings
« Reply #3 on: May 26, 2020, 04:11:21 PM »
I do much the same Luca. 

When i first bought the bike 14 years ago I found a couple of O ring kits, one metric and one imperial. Between the two I have O rings to fit everything. They are also standard Buna- N nitrile which seem to work well enough.

The one O ring I did buy as a specific spare part was the oil filter $2000 O ring which turned out to be a disappointment as is was supplied as a standard black 70 shore O ring rather than the the original soft white O ring which comes with proper filter kits.  I've never used it as won't compress easily enough to allow the filter cover to tighten up flush.

Barry Cheshire, England 79 R45

Offline mrclubike

  • Posts: 1437
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Re: Aftermarket carburetor o-rings
« Reply #4 on: July 18, 2020, 11:22:35 PM »
And then there is the much improved after market  Quad ring for the brake shaft 
1982 R65 running tubeless Snowflakes
2004 R1150R