Float Valve Seat O-ring Size???

bdholsin

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Real quick...I'm cleaning my carbs and I'm 99% certain my o-rings for the float seat should be replaced. Any thoughts on what size o-ring it takes? I'm guessing a #5 or #6 but wanted to run a poll and see what the seasoned veterans (aka old timers) have used.
 

Zombis

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Good luck finding those locally. Looked at every hardware store in my town and couldn't find them ended up just ordering mine from Yamaha for4.50 a pop. I nearly died when the dealer told me the price. although they did have them for me the next day which was nice.
 

xjwmx

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cycleorings.com I think it is has them if you want to order. I found some at a local hardware store that had a much smaller I.D., but once on the seat (with quite a bit of effort) gave a good seal into the carb body.
 

bdholsin

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I found a close size at my local Do-it-Best store and picked up 4 of them.

Now that I know the size I also found them on mcmastercarr.com. I can order a pack of 100 but seriously doubt I'll need every one of them.
 

U-turn

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Hey bdholsin,

I was wondering if you remember what size o-ring you found. My local hardware store is also a do-it-best, and I think I could use some o-rings as I have fuel leaking out of the carb overflow with the bike on the side stand.

Thanks!

edit- disregard: I have no o-ring.
 
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gggGary

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The BS34 carbs 80 to 83 use the Float valve O ring. The BS38s do not have this o ring.
And yes they are always hard and cannot be trusted to seal, they will allow gas to leak AROUND the float valve seal.
 

bdholsin

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I ended up picking up a bag of 25 viton o-rings from McMaster-Carr in the size that 5twins mentioned (1.5mm thick x 7.5mm I.D.). I'm going to have extras if anyone needs a couple for BS-34 carbs. Just let me know. I'll keep some for me so that'll leave about 20 for the rest of you.
 
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