CBR 600F 1987 - 1990 CBR 600F Forum

How to: Float Bowl Seals

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Old May 7, 2009 | 11:36 AM
  #1  
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Default How to: Float Bowl Seals

Okay so I have realized that there have been a couple of questions on here in regards to purchasing new carburetor float bowl seals...Dealership charges about $20-$30 CDN per seal and if you need 4 its a bit of a pain in the ****...This is what I did, and it has worked fine for me without any problems now for the last 9 months:

1) REmove carb assembly
2) Remove float bowls off each carb
3) Remove old float bowl seals
4) Get four 147 O-rings (made of Buna or Viton material which are resistant to gas)
5) Squeeze the o-rings into the groove where the old seal in the float bowl was. I used very small dabs of Krazy glue to hold them in the groove until I screwd the bowl back on the carbs, made it alot easier as the o ring would just like to pop out of the groove without having anything to temporarily hold it in place
6) Do NOT overtighten float bowl screws when reassembling...this can cause your bowl to crack. Figured this out the hard way
7) Reassemble bike
8) GIver

Okay so this worked really well for me...Carbs are now 100% drip free. Got the O-rings from eBay for $3.95 for a pack of 5. I also ordered 1 size above and 1 size below, so a pack of 146, 147, 148 to see which size fit best...I used the 147, but the 146 may have been better (the 148 is too big, don't boter getting it), try it for yourself. Hope this saves someone some moolah
 
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Old May 7, 2009 | 11:56 AM
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Awesome! good to know a cheaper alternative.
 
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Old May 8, 2009 | 08:32 AM
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damn thats clever, thanks!
 
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Old May 25, 2009 | 01:12 AM
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Default link?

do you have an ebay link to this seller? what year is your bike?
 

Last edited by fugly hurricane; May 25, 2009 at 08:23 AM.
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Old May 25, 2009 | 12:32 PM
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Yeah here is the link...

http://cgi.ebay.ca/5-size-147-O-RING...3286.m20.l1116

I juts went on ebay and searched "147 o ring" and it was the first one to come up. its from an ebay store called hill industrial supply....my bikes an 89 so if you have a 90 you will most likely need a different size. If not order both the 147 and 146 sizes and see which one fits better

cheers
 
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Old May 26, 2009 | 01:48 AM
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Very slick!

KongBastard
 
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Old Aug 30, 2013 | 05:50 AM
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Originally Posted by C-bass

Got the O-rings from eBay for $3.95 for a pack of 5. I also ordered 1 size above and 1 size below, so a pack of 146, 147, 148 to see which size fit best...I used the 147, but the 146 may have been better (the 148 is too big, don't boter getting it), try it for yourself. Hope this saves someone some moolah
This topic was a great piece of advice. I got metric O-rings similar to SAE size 147. Inside diameter was 67.0 mm and width 2.5 mm. These rings fit a bit too tightly. They tend to push themselves out of the groove. With super glue i managed to get them barely hold inside.

So, if someone else is about to replace leaking gaskets i recommend smaller (shorter) O-rings, which should stretch a bit when putting in the groove. Next time i would use metric size 62.0 mm x 2.5 mm. This would be very close to SAE size 143. You would still need super glue, but stretching would make them hold in their place easier.
 
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Old Oct 17, 2013 | 10:44 PM
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Just as an FYI to all, Amazon stocks these as well. They only come in packs of 50 but they're Prime eligible and are like $7.50

146 Buna-N O-Ring, 70A Durometer, Black, 2-5/8" ID, 2-13/16" OD, 3/32" Width (Pack of 50): Amazon.com: Industrial & Scientific 146 Buna-N O-Ring, 70A Durometer, Black, 2-5/8" ID, 2-13/16" OD, 3/32" Width (Pack of 50): Amazon.com: Industrial & Scientific
 
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Old Oct 18, 2013 | 05:50 AM
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Very good link this. I used 64mm x 2mm O rings bought ten for £1.95 of eBay and worked perfect.
 
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Old Oct 25, 2013 | 08:26 PM
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So I just attempted this and I was able to get the new 146 rings to fit without any glue, but a LOT of pressing down with my thumbs. And then I promptly over tightened the bowl and cracked it. I thought i was being careful and I was only going a .25 turn at a time but it still cracked. Be VERY careful when doing this. Under tighten if your worried and tighten as needed if it leaks. Now it's back to eBay for me lol
 
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