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Carb O rings
Posted: Sat Dec 19, 2020 4:38 pm
by cross
Hi guys,
I have carb O rings that I never used when I rebuild my carbs several years ago and now, carbs started leaking so I need to replace them.
The thing is that I used two of the O rings elsewhere and I’m short. Does anyone have two of the mid size O rings to sell me?
Randakks is sold out on the kits right now, it’s unknown when they’ll get them back in stock.
Another question that I have is how long is accelerator valve diaphragm good for?
Thanks
Re: Carb O rings
Posted: Sat Dec 19, 2020 6:10 pm
by JoeInTUS
Sasha
I believe the kit came with 2 extra o-rings of each size and you have enough since there are only five connections using 2 orings each between six carbs.
Joe
Re: Carb O rings
Posted: Sat Dec 19, 2020 6:20 pm
by cross
JoeInTUS wrote: ↑Sat Dec 19, 2020 6:10 pm
Sasha
I believe the kit came with 2 extra o-rings of each size and you have enough since there are only five connections using 2 orings each between six carbs.
Joe
I’ll do the count to see, thank you for the info
Re: Carb O rings
Posted: Sat Dec 19, 2020 6:42 pm
by JoeInTUS
Our expert at Restocycle reminded me that for the fuel connections on 80-82 carbs you only need 8 orings since there are two fuel inlets and no crossover between #3 and #4 carbs.
Re: Carb O rings
Posted: Sat Dec 19, 2020 7:42 pm
by Larry Zimmer
You didn't specifically mention the source of your rings. Be certain that they are Viton material. Otherwise, ethanol will eat them for lunch. If you need anything, you might check with Bill Brint at TIMS CBX. Also, Mike Nixon at The Motorcycle Project.
Re: Carb O rings
Posted: Sun Dec 20, 2020 7:36 am
by daves79x
You should be good per the comments above. And yes, Randakk seems to be out of the CBX carb rebuild kits more than they are in stock lately.
Dave
Re: Carb O rings
Posted: Sun Dec 20, 2020 5:56 pm
by cross
Larry Zimmer wrote: ↑Sat Dec 19, 2020 7:42 pm
You didn't specifically mention the source of your rings. Be certain that they are Viton material. Otherwise, ethanol will eat them for lunch. If you need anything, you might check with Bill Brint at TIMS CBX. Also, Mike Nixon at The Motorcycle Project.
These were from the Randakks carb kit, I’ve never used them. I think they are Viton
Thanks
Re: Carb O rings
Posted: Sun Dec 20, 2020 5:59 pm
by cross
daves79x wrote: ↑Sun Dec 20, 2020 7:36 am
You should be good per the comments above. And yes, Randakk seems to be out of the CBX carb rebuild kits more than they are in stock lately.
Dave
Thank you Dave.
How long are acc. Pump diaphragms usually good for? I changed it about 6/7 years ago when I got the bike. Now that I have to separate carbs to change the O rings, should I be getting a full kit and replace everything?
Thanks
Re: Carb O rings
Posted: Mon Dec 21, 2020 8:33 am
by daves79x
The accelerator pump and air cut-off diaphragms are certainly still good. Problem with the accelerator pump is that it's function in general diminishes over time due to it's poor design. Just clean all the linkages well, be sure they're free and bench test to be sure you're getting a good spray. If not, fiddle until you do, knowing that in a few years, or less, the thing probably won't be working nearly as well.
Dave
Re: Carb O rings
Posted: Mon Dec 21, 2020 6:53 pm
by cross
Thank you very much Dave
Re: Carb O rings
Posted: Wed Dec 23, 2020 12:00 pm
by cross
daves79x wrote: ↑Mon Dec 21, 2020 8:33 am
The accelerator pump and air cut-off diaphragms are certainly still good. Problem with the accelerator pump is that it's function in general diminishes over time due to it's poor design. Just clean all the linkages well, be sure they're free and bench test to be sure you're getting a good spray. If not, fiddle until you do, knowing that in a few years, or less, the thing probably won't be working nearly as well.
Dave
Dave,
I forgot to ask few more questions. First one is about float valves, they were available as a set with seats from Honda not that long ago but not any more. If i end up needing float valves, what do i do, are they compatible off of different model?
Second, i want to check my valves and cam chain this winter as well and the valve cover gasket is about 6-7 years old and i've already taken it off once after that, should i get a new gasket and sealing rubbers for the top bolts?
Thanks
Re: Carb O rings
Posted: Thu Dec 24, 2020 10:49 am
by daves79x
The float valves apparently just became NLA from Honda. But that wasn't the way to go anyway, usually. Your seats are very likely fine, just polish the sealing surface up with a Q-Tip and a little very fine rubbing compound. Then get genuine Keihin float valves from any of several places, PJ Motorsports, Sudco, etc. They must be genuine Keihin though.
Re-use your valve cover gasket. I'm still on my original one after 45,000 miles. But do get new hold-down bolt rubbers, making sure you get the late model ones, not the '79 version.
Dave
Re: Carb O rings
Posted: Thu Dec 24, 2020 5:59 pm
by cross
That's great, thank you
Happy Holidays
Re: Carb O rings
Posted: Mon Jan 04, 2021 10:20 pm
by cross
daves79x wrote: ↑Thu Dec 24, 2020 10:49 am
The float valves apparently just became NLA from Honda. But that wasn't the way to go anyway, usually. Your seats are very likely fine, just polish the sealing surface up with a Q-Tip and a little very fine rubbing compound. Then get genuine Keihin float valves from any of several places, PJ Motorsports, Sudco, etc. They must be genuine Keihin though.
Re-use your valve cover gasket. I'm still on my original one after 45,000 miles. But do get new hold-down bolt rubbers, making sure you get the late model ones, not the '79 version.
Dave
Dave,
When you reuse the valve cover gasket do you smear some type of sealant on it first?
And second, what type of grease should I be using on carb O rings when assembling?
Thank you
Re: Carb O rings
Posted: Tue Jan 05, 2021 6:45 am
by steve murdoch icoa #5322
Many threads on valve cover adherents and installation.
Cleanliness is a must.
viewtopic.php?f=25&t=5792
herdygerdy has a rubber band method of keeping the gasket in place that sounds effective.