Author Topic: a good carb rebuilt master?  (Read 1935 times)

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Offline emilios

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a good carb rebuilt master?
« on: June 08, 2011, 11:32:48 AM »
Hi
I just bought a CB750 K0 that needs a total rebuilt...
Im planning to start from the carbs...
I need your experience for a good carb restorer..
Thanks

Offline Bob Wessner

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Re: a good carb rebuilt master?
« Reply #1 on: June 08, 2011, 12:07:04 PM »
You can do them yourself.. really. I did mine. I was, at first, daunted by the exploded diagram in the parts manual. Really, it is just one carb 4X. They are perhaps the simplest of all the carb sets. Just take your time, keep parts associated with each carb together (think Tupperware ;)). If I can/could do it, anyone can.
We'll all be someone else's PO some day.

Offline emilios

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Re: a good carb rebuilt master?
« Reply #2 on: June 08, 2011, 12:27:26 PM »
Yeah i know how to rebuilt carbs...i did my cb500four 1972 and they work great but those carb are really rusty inside

Offline Johnie

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Re: a good carb rebuilt master?
« Reply #3 on: June 08, 2011, 01:17:38 PM »
And take pics through the process. That will help too. Are those carbs the original 4 cable carbs or did someone cheat and install some K1 carbs on there?
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline Bob Wessner

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Re: a good carb rebuilt master?
« Reply #4 on: June 08, 2011, 01:30:46 PM »
Are you sure it's rust? Dried fuel and crud can look like it. You might try soaking one to see. The carb bodies themselves will not rust. I used traditional, caustic carb soak when I did mine, but since have done and experiment with Simple Green (50/50 Simple Green and hot water). I let them soak for a few hours and the results were very impressive. If I had to do mine again I would go the Simple Green route.
We'll all be someone else's PO some day.

Offline Johnie

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Re: a good carb rebuilt master?
« Reply #5 on: June 08, 2011, 01:41:43 PM »
You probably already know this, but be sure your tank is clean or you will be cleaning those carbs a 2nd time. Ouch....
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline Bob Wessner

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Re: a good carb rebuilt master?
« Reply #6 on: June 08, 2011, 01:56:43 PM »
Good point. Could be the source of rust that has migrated to the carbs.
We'll all be someone else's PO some day.

Offline Johnie

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Re: a good carb rebuilt master?
« Reply #7 on: June 08, 2011, 02:09:15 PM »
Forgot to mention the filter screen in the petcock too.
1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline xsmooth69x

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Re: a good carb rebuilt master?
« Reply #8 on: June 08, 2011, 03:59:59 PM »
i just bought a bike and did the carbs for the first time in my life.

i will give you my experience.........

-first you will need the carb rebuild kits for each carb 4x

-some wire brushes.... i got these from home depot but i only used the bottom brush. the plastic bristles dont work and the brass bristles are to soft. the crappy thing is they come in 3 packs and they are the only small brushes i can find that arnt to stiff

*you always want to buy brushes that are softer than the metal of the carbs so you dont scratch them.

-also an old tooth brush.

-also you will need little storage containers. i went to the dollar store and bought a bunch of metal muffin trays.

-then go to autozone or whatever and buy the "shop size" cans of carb cleaners i used 3x cans

also my carbs where gross with gas syrup so i used a metal can and poured a whole can of sea foam and enough gas to soak my carbs and rack in.

download the shop manual for the bike. its in the forums and print out the carb section.

get your digital camera.

---------------------------------------------------------

throughout the dis-assembly take pics pics pics for anything you think u need to remember. (after your first 2 carbs you will remember everything. they look intimidating at first but they are actually really simple)

first you need to take apart each carb off the rack. (look at the manual you printed out) use your cup cake trays for each section/step u take apart.

now with all the carbs takin off start taking them apart in sections. use the cup cake trays for each step.

i removed the old gaskets right away.

then i looked at the carb kit and took off all the pieces that will be replaced and set all those aside so i dont take the time cleaning by accident and waste my time.

i did the whole sha bang in 3 steps, rack, 2x carbs left, 2x carbs right.

after disassembling 2x carbs left i soaked them in gas and in a separate can 2x carbs right.

i let them soak everything over night and then took my brush and went to town especially the float bowls. the top section of the carb i used a tooth brush. i didnt want to scratch the upper cylinder with the brush.

now after everything is clean this is the time to shoot the carb cleaner everywhere. this takes off all the residue. make sure to go through with the red stick nozzle through all the ports and inlet and outlets.

also the stick that is connected to the float bowl use a small paper clip and make sure that is clean.

replace everything in the carb with your new parts from the rebuild kit. (air fuel screw is 1 1/2 turn is a good starting point from what i understand) (also make sure you place the clip on the needle in the right position, or where it originally is)

reassemble the carbs

clean the rack

put all the carbs on the rack and you done!

well kind of

put everything back on the motor and tune the carbs.....

you will need a carb synchronizer http://www.z1enterprises.com/detail.aspx?ID=2727 $57.02 + shipping







« Last Edit: June 08, 2011, 04:01:50 PM by xsmooth69x »
1975 CB550 (FINISHED?!?!?)
first motorcycle ever!!! ow and i dont know how to ride it either :D

raw rust rice venti quad shot cafe racing latte project aka my build..... http://forums.sohc4.net/index.php?topic=88853.0

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1972 cb750 - next in line for some <3

Offline emilios

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Re: a good carb rebuilt master?
« Reply #9 on: June 09, 2011, 08:38:52 AM »
thanks all for your replies..but i forgot to mention that carbs was not on the bike but down next to bike...
i will send pictures to understand.
Thanks

Offline Scott S

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Re: a good carb rebuilt master?
« Reply #10 on: June 09, 2011, 10:05:25 AM »
 If you decide not to do it yourself, give Rick at Old Skool Carbs a call.

rick690@msn.com

http://myworld.ebay.com/oldskoolcarbs&ssPageName=STRK:MEFSX:SELLERID
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650