Author Topic: 1973 CB350f Carburetor removal  (Read 7784 times)

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Offline dogsoldier

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1973 CB350f Carburetor removal
« on: March 16, 2010, 07:21:28 PM »
I would like to first introduce myself. I am new to this forum, the world of SOHC motorcycles, and motorcycles in general. After nearly a decade of restoring antique and vintage bicycles I decided to put an engine on one of them. Shortly after that, I finally convinced my wife that a real motorcycle was a necessity. Two years ago I worked out a deal with my father-in-law to buy his cb350f for $300, but unfortunately we ran into financial difficulties and ended up losing our house and, more importantly, my garage. We moved into an apartment and a storage unit and the 350f sadly remained buried in the back of Jay's garage.

Back at the end of January, we got our tax return and I said, "Damn it, I need that bike". I went to talk to Jay and he said he would take $100 for it. I said I was going to offer $200, so he decided $150 was okay with him. I should have kept my mouth shut and payed him the hundred bucks.

The problem is that the last time this bike was even started was in July of 1990. It ran when it was parked, but doesn't now. I'm pretty sure that the first thing that I need to do is take the carbs apart, clean and rebuild them. I'm okay with doing that but, although I've found lots of resources on how to rebuild them, I can't find anything to tell me how to actually get them off. I've purchased a Clymer manual from an ebay seller but it hasn't arrived yet (and I'm beginning to wonder if it ever will). I recall seeing a step-by-step tutorial with photos and in printable format a while back. Despite searching for the past 3 hours (or 4 beers, depending on how you look at it) I can't find the article again.

Any information on the subject or a link to printable instructions would be very much appreciated, and to anyone who actually read all of this post, thank you for your patience.

Offline hoodellyhoo

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Re: 1973 CB350f Carburetor removal
« Reply #1 on: March 16, 2010, 08:06:31 PM »
There are a couple ways to take the carbs off, but fist you need to disconnect the fuel line and take the tank off. Then you can disconnect the throttle cables, the four overflow lines on the bottom, and the breather hose that goes to the top of the motor. You might want to drain the float bowls so you don't make amess when you get the carbs off.

At this point a manual will tell you to remove the airbox (which is the way I do it) but you can leave it. Just disconnect the rubber conectors and use a ratchet strap to pull the airbox away from the carbs. If you decide to take the airbox out be sure to disconnect the breather hose at the bottom of the airbox.
 
With everything disconnected, just loosen the 4 clamps holding the carbs to the motor and you should be able to wiggle the carbs out of their rubber inlets.

1972 CB350F (Back from the Dead!)- http://forums.sohc4.net/index.php?topic=20822.0
1965? S65 - Coming Eventually!
1972 CB750K2 (father-son project)
1976 CB750K6- (sold) http://forums.sohc4.net/index.php?topic=96859.0
1976 CB750K6 (sold)- http://forums.sohc4.net/index.php?topic=62569.0

Offline JBMorse

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Re: 1973 CB350f Carburetor removal
« Reply #2 on: March 17, 2010, 06:40:36 AM »
Well I was going to suggest downloading a shop manual, but our forum doesn't list one for the 350F.  Bummer.  You can, however, download the SOHC general service manual, which will get you started on a few things while you wait for the clymer.  Check the stickied thread at the top of the SOHC bikes tech forum. 
Congrats on the new bike.  You'll find lots of help here and in the end you'll know more about the bike than you thought possible!
1971 CB500K

Offline flybox1

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Re: 1973 CB350f Carburetor removal
« Reply #3 on: March 17, 2010, 07:22:35 AM »
Nice score for cheap!

remove and drain your fuel lines
take off your tank.
loosten and remove your push/pull throttle cables.
lift your seat and remove the air filter.
loosten all clamps (5) on the airbox boots.  one to the airfilter, and 4 to the carbs.
remove the duct between the airbox and the filter housing.
pull or gently pry (with a piece of wood) the airbox side of the carb boots off the carbs, and do your best to get that airbox completely out.  not necessary, i rarely do, but it will give you room to work.
Now, be sure to loosten all clamps on the carb to engine side of the carbs.
sit on your bike.
grab the carbs on the left and right side. gently pry them up and down while pulling towards the back of your bike (you can even use ratchet straps to help with this) if they wont budge, warm the carb boots with a hairdryer, or some hot water to soften them.  dont melt them  :P keep at it, they will break free.

and check this one...
http://forums.sohc4.net/index.php?topic=67231.0

« Last Edit: March 17, 2010, 07:24:06 AM by flybox1 »
'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 faux fiddy

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Re: 1973 CB350f Carburetor removal
« Reply #4 on: March 17, 2010, 10:38:30 AM »
Well I was going to suggest downloading a shop manual, but our forum doesn't list one for the 350F.  Bummer.  You can, however, download the SOHC general service manual, which will get you started on a few things while you wait for the clymer.  Check the stickied thread at the top of the SOHC bikes tech forum. 
Congrats on the new bike.  You'll find lots of help here and in the end you'll know more about the bike than you thought possible!

350 f is online somewhere, google it. I think there is a shop manual . com or something like that that has it.

DogSoldier- is that Commanche?
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Offline rempy

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Re: 1973 CB350f Carburetor removal
« Reply #5 on: March 17, 2010, 10:57:10 AM »
User Lars has a page about getting 350F carbs off:
http://www.hondahobby.no/website.aspx?displayid=1361

And the shop manual can be found at honda4fun:
http://www.honda4fun.com/man_officina/man_officina.html

There is a better quality version of the manual floating out there somewhere
but i can't find it at the moment.
'73 CB350F

Offline dogsoldier

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Re: 1973 CB350f Carburetor removal
« Reply #6 on: March 18, 2010, 04:41:13 AM »
Thanks for all the advice and quick replies. Rempy, that link to hondahobby was what I was looking for. Thank you.

Offline volare71

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Re: 1973 CB350f Carburetor removal
« Reply #7 on: October 26, 2012, 07:03:58 PM »
This is a topic that sould stay alive.  I am in the process of removing a seized CB350F engine that looks pretty good on the outside, but it has been sitting for years.  The Molex connector for the ignition switch is falling apart as is the battery.

I have the airbox off and all the carb clamps loose but the carbs are tight in the rubber inlet tubes connected to the head.

The official Honda manual just says take off the coils and remove the carbs.

I removed the screws plugging the vacuum gauge holes and sprayed liberally with carb cleaner.  everything is drenched in Liquid Wrench and I'm hoping that the seal will give with some lubrication.

In need to get the head off to see why it is frozen solid.  The tappets look pretty clean.  At this point I'm hoping I can salvage the motor.   

Offline flybox1

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Re: 1973 CB350f Carburetor removal
« Reply #8 on: October 26, 2012, 07:50:01 PM »
Put leather gloves on to save your knuckles.
Sit on your bike and grab your carb ends.
Pull up and push down while pulling the bank of carbs to the rear.
They'll come loose...
'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…"