Author Topic: carb removal  (Read 1319 times)

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Offline gto_ron

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carb removal
« on: October 19, 2012, 05:33:35 PM »
At the advice of several members I'm rebuilding the carbs on my 76 750K.  It looks like the carbs have never been off the engine.  How do I get the carb rack loose from the rubbers going to the head?  I don't want to damage the rubber but the rack is stuck solid.  Is there a trick to it?

Ron
Ron


76 CB750K
72 CB350F
64 GTO

why yes, I am old-school, so what? 

These are the good old days.

Offline flybox1

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Re: carb removal
« Reply #1 on: October 19, 2012, 05:44:02 PM »
Remove your gas tank.
 Get your airbox off and out. 
Remove the throttle cables from the carb bell mechanism.
Loosen all the engine side carb boot clamps.
Sit on your bike. Gloves on...
Reach down and grab the ends of your carb, and with a roll up and roll down motion, wrestle them off...
'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 brewsky

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Re: carb removal
« Reply #2 on: October 19, 2012, 05:50:43 PM »
+1
You can also heat them up with a hair dryer first
66 CA77
78 550K
78 CB750K
02 FZ1
09 GL 1800

Offline bjbuchanan

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Re: carb removal
« Reply #3 on: October 19, 2012, 07:39:17 PM »
just wiggle the hell out of them and if you aren't smart you will get a nice knuckle buster

afterwards i take the boots themselves off by just leveraging with a screwdriver. don't be ham fisted but the components are tough
The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

Don't trust me alone with a claw hammer and some pliers

Offline mac_48

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Re: carb removal
« Reply #4 on: October 19, 2012, 09:20:48 PM »
it takes a while so don't get discouraged... I don't know if it was smart or not but I used a broom handle made of soft wood to pry them off a bit in combination with the previous suggestion
« Last Edit: October 19, 2012, 09:28:27 PM by mac_48 »
'72 CB 750k

Offline Bailgang

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Re: carb removal
« Reply #5 on: October 20, 2012, 01:42:46 AM »
You can also heat them up with a hair dryer first

+1 on that. You can also use a heat gun so long as you don't let it get too hot.
Scott


71 cb350 twin
77 cb750 F2
83 gl1100 Interstate

Offline ekpent

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Re: carb removal
« Reply #6 on: October 20, 2012, 04:09:06 AM »
Big +3 on the heat gun. I get them good and hot and the rubber softens up nicely. Use a little lube and heat when you put them back on. I only loosen the clamps up by carbs and use the Flybox style with Gloves,when they pop off you may appreciate that protection  ;)
« Last Edit: October 20, 2012, 04:14:59 AM by ekpent »

Offline gto_ron

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Re: carb removal
« Reply #7 on: October 21, 2012, 07:13:03 PM »
thanks all,

 I used everyones' tips, the carbs are off and my knuckles aren't bleeding.

Ron
Ron


76 CB750K
72 CB350F
64 GTO

why yes, I am old-school, so what? 

These are the good old days.

Offline Thousandson

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Re: carb removal
« Reply #8 on: October 21, 2012, 07:20:26 PM »
I took my carbs off a few months ago. I'm kinda bummed, I wish I put a cloth rag over the starter cover I have some nice pretty dents on the cover now. Back to the bench to flatten them out.

I also put the carbs back on, with a 1" ratchet strap all the way around the motor, and lubed the inside of the boots and the aluminum inlets with some air tool oil. worked pretty well, no heat required.
Current ride: 78' Cb750F

Offline mac_48

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Re: carb removal
« Reply #9 on: October 21, 2012, 07:37:03 PM »
Before you try to put them back on, I'd soak the carb boots in a wintergreen oil and xylene 50/50 mix for a day or two to restore the rubber.  It makes the rubber like new and will make it way easier to slide the carbs back on.  Also, if they swell up when they soak don't worry about it because they will shrink back to normal size.
'72 CB 750k

Offline flybox1

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Re: carb removal
« Reply #10 on: October 21, 2012, 08:43:27 PM »
My 350f's carbs slid on easy.
My K8's won't go on without a little lube and a ratchet strap.
'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 Tugboat

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Re: carb removal
« Reply #11 on: October 22, 2012, 10:22:39 AM »
+1 on the wintergreen/xylene trick. Works a treat!
If it's worth doing, it's worth doing twice.