CBR 1000F "Hurricane" 1987-1996 CBR 1000F

Carb Tee O-Rings

  #1  
Old 07-27-2018, 09:03 AM
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Default Carb Tee O-Rings

1987 CBR100F - I've noticed I am getting a lot of fuel leakage at the two plastic t joints between the pairs of carbs. The t's look good - the leak appears to be from the joints at the carbs themselves - I am assuming the ethanol content of today's fuel has deteriorated these o-ring seals. Google tells me they are Honda part number 16101-MM5-505, and while available, they are fairly expensive. In my search, I cam across this site - https://newmotorcycleparts.net/fuel_...l_o-rings.html where it looks like the o-rings can be gotten much more reasonably. My question to the group - does anyone know what size these o-rings are? I've read that they are a "non-standard" size, particular to Honda.Any input is welcome.
 
  #2  
Old 07-27-2018, 09:12 AM
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Hey there, If you go to Harbor Freight, you can buy an entire set of O-rings of various sizes, one in metric and another in ASE. Both entire sets are cheaper than buying individual ones from a parts store.
 
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Old 07-27-2018, 03:29 PM
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My concern would be the ethanol resistance of a Harbor Freight o-ring - and the references I've come across to the "non-standard" size - diameter and cross section of the Honda parts. The link provide at least claims to be ethanol tolerant - and the prices are MUCH better than for an "official" Honda part. Anyone know what size thes o-rings actually are - or what size will work to make the needed seal?
 
  #4  
Old 07-27-2018, 07:23 PM
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I've never had any issue with the HF o-rings. They are rated for fuel. If you think about it, unless they changed the o-rings to specifically account for ethanol, the OEM o-rings probably aren't any better because your bike was built and spec'd prior to ethanol usage.

I don't know the exact size for your t-fittings, I have always fitted them till they were tight yet but would fit and go from there. Never really had an issue.
​​​​​​
 
  #5  
Old 07-27-2018, 11:07 PM
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Be mindful, that Honda is known to use weird metric sizes for o-rings. Don't ask me how I know. I had the same issue and ended up paying the price of doing the job again.
 
  #6  
Old 07-28-2018, 07:58 AM
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And that is what I am trying to avoid - some of my research has indicated the same thing - hence my question for the group as to the size of the "correct" o-rings.

That said, Harbor Freight certainly isn't expensive and other than the time lost, may be worth a shot.
 
  #7  
Old 07-29-2018, 11:40 AM
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Had the same sizing issue with o-rings for the coolant pipes on my bike. Honda used 2.5 mm x 18, if I remember right

For fuel look for viton and avoid buna material.

My research shows that 16101-mm5-505 is a full gasket set for the carb, not just the o-ring

https://www.bikebandit.com/oem-parts...151648#sch1494

I think you're going to have to pull one and put the calipers to it
 

Last edited by wooferdog; 07-29-2018 at 11:56 AM.
  #8  
Old 08-23-2018, 07:07 PM
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To bring this to some sort of a conclusion - after much research, I found a reference to a similar problem in a list for CB750's. One of their folks said they had gotten an 8 x 2 mm o-ring at NAPA and said it solved their problem. Well, NAPA being just down the rod, I tried it. The ID of the O-ring is a bit bigger than the actual groove of the tee - but it was a snug fit into the carb body - and more importantly, it didn't leak!! Carbs are back on the bike and it is now holding fuel!! A few minor things to attend to, and it should be back on the road.

While researching the issue, I did come across this site - Orings and More | Affordable and Quality Gaskets and Seals - they have all sorts of kinds and sizes of o-rings. I ordered some on either side of 8 x 2 mm just in case. You can't beat getting 10 to 25 for a dollar - and the shipping was only $3.00. If the problem reccurs, I've got a lot to work with. I did look at the Harbor Freight assortments, but unless there is one I didn't see, none of them went down to the size needed.
 
  #9  
Old 08-29-2018, 07:00 PM
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Default It turns out my carburetors T O rings

Are bad too.
Thanks for the post and information.
I took it a step further and used the search feature on the O rings and more site, using the original honda part #, they cross reference to this

 
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