Fuel injection adjustment screw o ring size

[lhead]

My 1993 k1100rs is apart and I'm working on refurbishing the FI system. The majority of the rubber hoses and associated bits are original - i.e. 20 years old. My concern today is the O rings that fit around the air adjustment needle valves. None of the rings in my Harbor Freight set will work. I don't know exactly what the size of the OEM ring is.

Has anyone else here replaced these rings? And idea of size or source?

Thanks Guys

Charlie

[Grim]

Hmmmm normally its easy to look up parts but if you and I are on the same page I'm stumped.

Lot of parts like bolts when you drill down to them in the online catalog it will reference the size. I just cant seem to find the catalog showing those O rings as a separate part.

I think your talking about "adjusting screw" Part # 20 on this diagram.

http://www.bmwmcchattanooga.com/showAssembly.aspx?ukey_assembly=194649&ukey_make=398&ukey_model=7529&modelYear=1993&ukey_category=8483&ukey_driveLine=121&ukey_trimLevel=743

[lhead]

#20 is exactly the part. No separate O ring mentioned.

I'm thinking about doing a measurment on the ring size and looking it up on McMaster Carr. Then I'll have 96 extras.

[lhead]

So I measured the o ring size for the FI brass screws. 5.5mm ID, 1.0mm cross section. Ordered a pack of 25 from McMaster Carr today.