How To: Clean your carbs
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How To: Clean your carbs - 5/31/2007 10:09:24 PM
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therabbit
Posts: 476
Joined: 4/26/2007
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How to carb carburetor cleaning clean
Did a search and didn't see anything about how to clean your carbs, even though it's pretty easy to do some people think it's a fairly daunting task, so I decided I'd snap a bunch of pictures while I did mine and make a quick write-up. Having said that, don't try this if you're stupid or mechanically challenged, you can break expensive things and cause a lot more damage then good. However, if you know the difference between a screwdriver and a socket wrench you probably have enough mechanical know-how to do this.
This was all done on a 2000 CBR 600F4, it will be different on other bikes, but very similar. The only tools needed (except for the tools to get to your carbs) are a phillips screwdriver, 4mm and 3mm allen wrenches, and some spray on carburetor cleaner.
Start by removing your carbs. You can do this with the carbs in, but it's a lot easier and safer with them out. Basically: Remove gas tank, remove air-box, unplug fuel lines and vacuum lines, remove throttle cable, remove carbs. (If this is your first time doing this expect this to take at least 2 hours, those band clamps are a pain the first time around)
Now you have your carbs removed:
In case you're wondering this little screw here is what you're looking for to do carb synchs (there's 3 of them 1&2, 3&4, and the 1,2&3,4 balancer):
First step is remove your float bowls.
Remove these little bolts (4mm allen) there's 3 per bowl:
Keep everything ordered (cylinder 1,2,3,4). Once you have the bowl off, clean it out with carb cleaner. It should look like this clean:
Next, very carefully slide out the retaining pin on the float, I used to pocket knife to get it started then grab it with your fingers (not pliers) and pull it out:
Once the pin is out the float should be resting on the float valve, very carefully lift out the float and floatvalve:
Clean off the float, the valve, and the interior of the bowl until they sparkle like new.
Reassemble the float chamber the way you took it apart, put the float valve into the carburetor and drop the float onto the neck of it (Sorry for the out of focus picture):
Gently lift the float up to align the pin and slide it in:
Put the bowl back on and tighten the allen bolts down (make sure the gasket is on there).
Alright, on to the opposite side of the carburetor to the vacuum chamber!
Slowly remove the 3 allen heads holding it on (3mm) (sorry no picture). Do it slowly because it is spring loaded.
When you take off the cover grab the spring before it shoots off. Once again set things aside by cylinder.
GENTLY grab the hard plastic of the diaphragm and slowly and carefully slide it out:
The needle in there is delicate, do not grab it by the needle, set it down on the needle, bend the needle... etc.
Clean out the inside of the vacuum chamber with carb cleaner, clean off the needle, and diaphragm, as well as the vacuum chamber cover
Reassemble things in the reverse order. Very Very Very Very car
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RE: How To: Clean your carbs - 5/31/2007 10:26:42 PM
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bindelsf2
Posts: 1327
Joined: 5/7/2006
From: YES THAT IS A 900 ENGINE IN A F2 ON SPRAY
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wow man! that is a definate asset to the site!! great write up!!
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RE: How To: Clean your carbs - 5/31/2007 10:30:48 PM
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amaank
Posts: 154
Joined: 5/9/2007
From: Denver, CO
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Thats a brilliant walkthrough!
Thanks and Well done!!
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RE: How To: Clean your carbs - 6/1/2007 1:14:26 AM
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bushmasterAR15
Posts: 1040
Joined: 8/11/2006
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+1, very nice.
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RE: How To: Clean your carbs - 6/6/2007 11:48:24 PM
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cbrpilot
Posts: 8
Joined: 1/22/2007
Status: offline
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Rabbit, is it customary to clean the carb jets during this project since everythings disassembled and accessible? I've watched a friend do mine, and he "boils" the jets in some cleaner before reinstalling them in the carb housings. Any input on this?
Also, is it the cleaning you describe here that returns the crisp throttle response or the jet cleaning? Thanks for an excellent tutorial.
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RE: How To: Clean your carbs - 6/7/2007 12:58:54 AM
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therabbit
Posts: 476
Joined: 4/26/2007
Status: offline
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You can remove the jets to clean them, I just sprayed carb cleaner into them, no idea if removing them and boiling them would clean them more or not, that carb cleaner stuff is pretty strong by itself. And yes the cleaning here can renovate your throttle response, also can up your gas mileage if you notice that drooping, typically though it's just used if the bike has been sitting for a while, such as after winter storage (the carbs there had been sitting for over 2 years  ). If you continually have gas running through them, they'll almost never need to be cleaned unless some sort of deposits start to build up in them.
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RE: How To: Clean your carbs - 6/10/2007 9:56:31 PM
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slo_rdr
Posts: 22
Joined: 11/12/2006
From: Texas
Status: offline
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Thanks for the tutorial!
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RE: How To: Clean your carbs - 6/11/2007 10:20:50 PM
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FFCBRf4i
Posts: 1147
Joined: 8/31/2006
From: Los Angeles, CA
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awesome job! great addition to the "how-to" section.
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RE: How To: Clean your carbs - 7/22/2007 4:05:40 PM
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bigjoe87865
Posts: 162
Joined: 11/20/2006
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Dont you have to sync the carbs once you are done?...
iv never done this before... but plan on doing by next month... and maybe install a jet kit while im there...
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RE: How To: Clean your carbs - 8/8/2007 2:54:44 AM
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allenpa5
Posts: 73
Joined: 6/22/2007
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Yea this is a really great walkthrough. But what about unscrewing the needles/jets and spraying those out? I read another guide on how to clean your carbs and it said to make sure you clean the individual jets. So I guess my question here is should you or shouldn't you?
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RE: How To: Clean your carbs - 8/9/2007 5:31:46 AM
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dawued
Posts: 40
Joined: 7/31/2007
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great write up! I have no idea what parts you cleaned but it was great! I am mechanically stupid! just dumb when it comes to mechanics. I can change the oil though, other than that, I am just a dumb as you will find! GREAT WRITE UP!
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RE: How To: Clean your carbs - 8/21/2007 12:46:16 PM
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cbr*sealik84
Posts: 18
Joined: 8/2/2007
Status: offline
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thanks for the info. iwas wondering though do your carbs when on the bike and everything back on filter bopx air filter and so on, do your carbs spit fuel on to your air filter. because when i took out my air filter it was saturated with fuel. just wondering.
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RE: How To: Clean your carbs - 8/21/2007 4:09:06 PM
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CB900RR
Posts: 54
Joined: 5/19/2007
Status: offline
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same as my local shop as well im too lazy to do it myself now theres a great walkthru to gide me thru it. quote:
ORIGINAL: stynkmonkey
My local shop wants to charge about 400 bucks for this. You just saved me a bunch of cash. Great writeup man.
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RE: How To: Clean your carbs - 8/30/2007 6:28:43 AM
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redzintimidator
Posts: 1267
Joined: 8/6/2007
From: Greene, NY
Status: offline
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****HOW TO CLEAN THE IDLE JET** Bike not idling, only idles with choke on, LOW RPM sucks, with no power at low RPM
On the picture above, looking down into the float bowl. Those 3 little brass things, 2 of which have slots for a screwdriver, take a very well matched screw driver to the little one, apply some downward pressure, they are in there a little tight. Take it out and try to look through it. you should see a hole a little bigger than a fishing line, if it is really small, or you cant see through, it needs to be cleaned. Take some carb cleaner, and that jet, and soak it in a pool of cleaner for about 15 mins. Take it out of the cleaner, and get some fishing line, push it through the jet, through that tiny hole, then ones its all the way through spin it on the line to get all the junk loose. Take the line out and put the jet back into the cleaner. swirl it around, take it out and wipe it down, apply more cleaner. re-install, pushing down on the screwdriver to not strip it. Then just reassemble, and your good to go.
If your bike is only not running well on idle, and low rpms, you only have to clean this!!
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< Message edited by redzintimidator -- 6/11/2008 5:43:04 AM >
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