Topic: CB350F Carburetor Insluator O-ring Size ?

[Dr. Frankenstein]

Does anybody know the complete specs for the carb holder O-rings on a CB350 Four? (Part Number 16173-253-004). I need O-rings, and the insulator itself mic's out at 32 ODx27 IDx2.4 CS, but all I can find as far as the dimensions go is "27x2.4.."   

Measuring the GROOVE, my micrometer meanwhile shows the dimensions as 32mmODx27mmIDx2.4CS...another spec I came across for the O-rings is 27 ODx22.2 IDx2.4 CS...which one is accurate? 

Would a 27x22x2.4 fit..?

[Dr. Frankenstein]

Hi Ozzy - yes, you did, but I had already ordered some; and besides, the ones in the picture are not the right size - I'm talking about the O-rings that go on the carburetor mounts, or "insulators" -y'know, the carb boots that go on the cylinder head that you stick the carburetors on...those O-rings...

Check your messages.

[Ozzybud]

They are the same as the valve cover caps i believe. Readily available

[Rayzerman]

The part description is 27 x 2.4, which is ID and profile.  That would make the OD ~32.  I always thought these were a little thin, and there appears to be room to squish.... in other words, a 2.5+ profile wouldn't hurt.  I bought some new aftermarket boots (I had cracks in mine) and used the O-rings that came with them.... I seem to recall I ordered some others of some fuel resistant type... will have to measure them up......

[Dr. Frankenstein]

FWIW I found these on Amazon: https://www.amazon.com/dp/B07W991ZLH?smid=A1THAZDOWP300U&ref_=chk_typ_imgToDp&th=1
I think these'll fit nicely.

I did measure the CB350F rocker arm caps against the manifold boots, and the rocker arm caps were too big/not the same size as the manifold boots; I'm anal like that...besides, $6.69 for ten nitrile O-rings beats the $8.95 apiece for the 'solid gold Honda' O-rings I've seen advertised online. I don't think my bike will care. Of course, if they're not a good fit, I will report.

[HondaMan]

Normally, O-rings are spec'd by [ID] x [thickness]. Then the OD is already defined by default.