Topic: Aftermarket Carb O-Rings - and a Rant!

[Dr. Frankenstein]

Here's an aftermarket carb kit I bought for the 1971 - 1974 Honda CB350 Four - - the sizes are right, but the O-rings have me a bit stumped: which ones do the jets get?? The fat donut-looking one on the far right is too 'fat' for the main jet, while the ones in the middle are too big; the second one from the left is too fat for the float valve grooves to allow it to fit, and the tiny one on the left I assume goes to the air screw, but the carburetor diagram doesn't show an O-ring in there, and it's too small for the main jet!

So, what's a poor bike builder to do...? - since this 350 Four I'm working on was a basket case when I got it AND came with a designated full set of (shudder!) 4-into1 carb kits, I scavenged the right sized O-ring for the main jet and float valve, which allowed me to get the jets in with an O-ring around them - but my Rant is, regardless of whether or not they are designated for the CB350 Four (which they allegedly are), the MAIN JETS of the 4-into-1 kit DO NOT FIT the CB350 Four jet holders/little 'butterflies' that keep the main jet in! The 4-into-1 jets are too big!

NOT that I am surprised, this isn't the first time I've gotten bad stuff from 4-into1- - but how the hell do they stay in business??  I/we/us cannot be the only ones getting shafted by 4-into-1! It amazes me...

That being said, I can't afford a bona-fide Honda carb kit for this bike, IF they even make one - but since CruzinImage now charges double for their stuff thanks to all these tariffs, where are you getting carb kits for vintage bikes that fit?? Common Motor?

[Ozzybud]

Most of the kits I have seen do not have the correct size. By looking through past threads and talking to hondaman
 I bought a bunch at the o- ring store. They were super inexpensive but I had to spend ,$10.00. I have used them on 3 bikes now and they are the perfect fit
 Pop right in with a little grease.

Send me your address via messages and I will send you a set.

Push them in never twist.

Its should be the tiny one in your picture they definitely need to be stretched onto the main jet

[bryanj]

Or ask nurse julie on here, she does viton o ring kits for the 400, from uk but i believe she does deals for forum members

[kerryb]

I get my o-rings from the oring store, & always buy a dozen or 2 of each size. I also buy a few of the next size up or down.   Just so the shipping isn’t more than the parts.  I learn what sizes, any way I can, usually with help here.  I have successfully used a too-large oring for a bowl seal by cutting and glueing back together with “Gaskacinch” in a can.  Worked very well.  After a few years collecting sizes, sometimes I don’t need to order any for the current job.  I probably have $50 invested in O-ring stock piles.  Always use original brass cleaned the best you can.