Quickie: Pilot screw o-rings - same size as washer?

Hey all,

Quickie question: In disassembling my carbs: all four had good pilot screws (fine thread, brass), good springs and new-looking washers... but NONE of them had o-rings underneath!!

Rather than wait for a parts order, I'd like to try to source some locally; is the o-ring the same size as washer?

TIA,
Duncan

'83 750 Seca

 

either 1 X 2.5 metric or size 003. i think it's the 003. the bags spilled out in my o-ring box

 

They should be viton or similar fuel safe. Prob could get by, but technical viton

 

Why do you say that, vash? Buna-N (the common black o-ring material) is rated for petro fuel use; and I obviously won't be running fuels that contain ethanol. Viton is for high-temp use, if my pilot screw ass'y is getting hot enough to melt nitrile (>250F) I've probably got other problems...

Polock, are you sure, and/or can anyone confirm 003? My local fastener supply sells 100-count bags - If I end up grabbing them, I'll offer the rest to members here, for the price of a stamp.

 

in my world that's what goes in carbs


http://www.theoringstore.com/index.php? ... =page&id=2


(great place to buy from too)

 

Excellent resource, thanks!!

 

after sorting thru the spilled bags, i pulled a screw out of the spare rack and the ones i used are 1 X 2.5

 

with all the problems with carbs I have, I cannot imagine purchasing o-rings that are not tried and true ...... Yamaha or Chacal or a source similar.

 

Sounds like you have an extensive o-ring assortment. Would you happen to have the specs on the fuel rail and throttle shaft O-rings?

 

For what it's worth I have bought from theoringstore for years. And have rebuilt more carbs and engines than I can remember. Professionaly and personal. Lots of machines of all types

 

you need 2 #11 o-ings per seal, but it ain't that easy. the 2 o-rings are just a hair wider than the grove for the c-clip likes so you have to squeeze it in, no problem but the 30 year old fiber washer under the c-clip doesn't like abuse and will probably crack, i made aluminum ones.
you have to use silicone grease on them and make sure they don't hold the butterfly open, their tight and there's no doubt about the seal.

 

Thanks Polock. Just sold the Maxim; now getting the Seca ready to go.