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Author Topic: Cb350F Float Question.  (Read 821 times)

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Offline dscri001

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Cb350F Float Question.
« on: September 01, 2015, 09:10:01 AM »
Hello everyone. I had a couple questions about the cb350f and thought id introduce myself. This is my first post in the forum as I am new to the cb350f and motorcycles in general. Have a little riding experience on dirt bikes but this is my first motorcycle. I just bought a 1972 cb350f with 3248 original miles. I'm in the process of restoring as much as I can to get it on the road again. It has been sitting for a while. I'm guessing 10 years. Its not in terrible shape. Not too much rust on the exterior. Engine turns over and has compression. I have done a lot of reading on the forum but have not been able to find info on the floats. As I was disassembling the carbs I had trouble getting the pins out and ended up breaking the post. Also, the hinge snapped off of the float bracket. I was wondering if these would be ok to weld repair? Would JB weld be ok? I would like to try and repair these first. If not, should I replace all four? Thanks in advance for the help.

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Offline flybox1

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Re: Cb350F Float Question.
« Reply #1 on: September 01, 2015, 09:39:43 AM »
Welcome!
you have two options.
Replace that carb body.  contact forum member harisuluv to see if he has one to sell you.
He may also be able to help you locate a new float.
or
look in the services offered section of the forum or search for micro welding. 
a forum member offers this service.

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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline spanners

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Re: Cb350F Float Question.
« Reply #2 on: September 01, 2015, 10:02:42 AM »
Hi there,  I think you really need to find yourself a good second hand carb body and float.  I think (correct me somebody if I am wrong) all epoxy resins are affected long term by petroleum.  I don't believe carb metal is weldable in any way, it is almost diacast type material.  If you really want to try and re glue the post, dependant on where it is actually broken (how much meat you have left to re fix)   chemical metal is much better at being petroleum proof, but then not as strong as epoxy.   Again dependant on where the hinge is broken and how good you are, you may with some ingenuity be able to straighten & solder it back  together. 

Many things are possible with a lot of skill experience and ingenuity, but personally given the vibration the carb gets I would not consider repair. 

Breaking the post or posts?  replace all four what?,  do you mean all four floats ?   
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1972 CB 750 K2
1975 CB 550 K1
2004 Boxercup Replica

Offline flybox1

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Re: Cb350F Float Question.
« Reply #3 on: September 01, 2015, 10:25:08 AM »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline dscri001

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Re: Cb350F Float Question.
« Reply #4 on: September 01, 2015, 11:12:50 AM »
Thanks for all of the quick replies! For some reason my computer wasn't accepting the captcha for search function and I have just been skimming through threads. Now I have found a lot more information. Do you know what kind of material the bodies are? A friend of mine is a qualified welder here at work (machine shop) and could possibly do it. I appreciate the help, just feeling out some options as I am anxious to get the bike started!
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Offline dscri001

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Re: Cb350F Float Question.
« Reply #5 on: September 01, 2015, 11:20:12 AM »
Quote from: spanners on September 01, 2015, 10:02:42 AM
Hi there,  I think you really need to find yourself a good second hand carb body and float.  I think (correct me somebody if I am wrong) all epoxy resins are affected long term by petroleum.  I don't believe carb metal is weldable in any way, it is almost diacast type material.  If you really want to try and re glue the post, dependant on where it is actually broken (how much meat you have left to re fix)   chemical metal is much better at being petroleum proof, but then not as strong as epoxy.   Again dependant on where the hinge is broken and how good you are, you may with some ingenuity be able to straighten & solder it back  together. 

Many things are possible with a lot of skill experience and ingenuity, but personally given the vibration the carb gets I would not consider repair. 

Breaking the post or posts?  replace all four what?,  do you mean all four floats ?   

Only broke one post. Yes all four floats. Wasn't sure if having one brand new float and 3 used would have any negative effects. I was assuming that as long as they're all set to the proper height everything would be ok.
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Offline flybox1

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Re: Cb350F Float Question.
« Reply #6 on: September 01, 2015, 11:23:16 AM »
$25 + shipping is worth it knowing its going to be done right the first time. 

a used 350F float will work fine.
Set its height per the book, and verify the fuel level using the clear tube method.
use the search bar to learn more....
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline spanners

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Re: Cb350F Float Question.
« Reply #7 on: September 01, 2015, 11:44:48 AM »
Brilliant neat bit of micro welding that,  never heard of that before, I wonder if anyone does that over here in the Uk ?

was that not $25 back in 2007  though?   
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1972 CB 750 K2
1975 CB 550 K1
2004 Boxercup Replica

Offline lucky

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Re: Cb350F Float Question.
« Reply #8 on: September 02, 2015, 11:51:11 AM »
Don't work on carbs any more. They are too delicate for your brute strength. Lol..lol
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Offline harisuluv

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Re: Cb350F Float Question.
« Reply #9 on: September 02, 2015, 12:24:17 PM »
Yes I have bodies and floats for your carbs.  PM me if you need them.
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