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Author Topic: Carburetor help  (Read 1013 times)
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ballinlikeabeave Topic starter
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« on: September 12, 2010, 08:20:19 PM »

Hi everyone, I am new to the site. I am 19 and have recently bought an 82 650sc to tear down and rebuild. I have had dirtbikes while growing up and am pretty handy with cars, but never dealt much with streetbikes. So after that short introduction here is my problem. After doing multiple searches I have come up rather empty handed. The bike does not run, all electriconics are fine, etc, I have narrowed it down to the carbs ( which is what the previous owner also suggested, and waht I would expect out of a nearly 3 year old piece of machinery) so when I went to open them up I noticed that the jets had been mangled by a screwdriver here and here from what appears to be work done by someone who had no clue as to what they were doing. so my question is, where can I find a rebuild kit for my carbs? I have looked on ebay and it seems to be the only place I can find them.(im not much for buying parts from ebay) but I cannot seem to find them anywhere else. Thanks in advance

this is the ebay site I am currently looking at

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=310202890413&crlp=1_263602_263622&ff4=263602_263622&viewitem=&guid=8bdcf84012a0a06c1c45aab5ffc93a2a&rvr_id=138960802154&ua=WVF%3F&itemid=310202890413
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gammer
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« Reply #1 on: September 12, 2010, 08:48:02 PM »

Hi ballinlikeabeave and  welcome

Sounds like you are starting in the right place...the carbs. Especially if the bike has sat for a while, the carbs will need to be cleaned.

If the jets are mangled, then you could order them separately on their own. They are available from the Honda dealer.
I only mention this because most times you don't really need a carb kit and they are expensive. If you can get the jets you need individually then it might save you some $$.

Also here is a handy thread on cleaning the carbs (as one bank) with Pine Sol:
http://nighthawk-forums.com/index.php/topic,4472.0.html
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« Reply #2 on: September 12, 2010, 09:02:14 PM »

 welcome to the forum!  +1 on what gammer said and let me just add that ebay is your friend when working on these older bikes.  Sometimes you just have to keep your eyes peeled for something and pounce when it comes up.
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ballinlikeabeave Topic starter
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« Reply #3 on: September 12, 2010, 09:10:41 PM »

Wow thanks for that link... you just saved me hours of work. I considered going to the dealer, but isnt there a slightly good chance ill be paying out the yang for parts from the dealer?
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« Reply #4 on: September 12, 2010, 09:13:43 PM »

Not only will you pay big for parts, but carb labor makes the $$$ appear in the dealers eyes like in the old cartoons.  They will hit you with major labor charges and probably break something else while they're at it...there's a reason why we call it the "stealership" around here.  very mad
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gammer
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« Reply #5 on: September 12, 2010, 09:16:52 PM »

Wow thanks for that link... you just saved me hours of work. I considered going to the dealer, but isnt there a slightly good chance ill be paying out the yang for parts from the dealer?

Check this out:
http://www.powersedge.com/pages/parts/viewbybrand/7/Honda.aspx

Looks like the main jets are $5.69 ea. And the slow jets are $6.34 ea.

Are all the jets destroyed?
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ballinlikeabeave Topic starter
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« Reply #6 on: September 12, 2010, 10:43:33 PM »

I didnt have the  time to completely disassemble all of the carbs, but I got to mess around with one and noticed that a few of the heads were mangled where he had used a screwdriver that was too small to take them in and out. (however none of them appeared to have been over tightened and crunched up) I am no carb master, but I assume that when messing with parts that need to be so finely tuned like jets, I would assume its not good to go tearing up the ends. I am not sure if all of them are like this, but judging from the shotty work the guy did with the rest of the bike I would say it is more than safe to say that the rest are in similar condition.

once again gammer, thanks for the link,do you happen to have any explaining how to tune carbs as well? I have been asking around and the common consensus is thati can either attempt it myself( which I would like to learn anyway) or cut off my right arm and use it as currency.

Once again thanks guys. 
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SirSeanSean
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« Reply #7 on: September 13, 2010, 07:13:15 AM »

Quote
Also here is a handy thread on cleaning the carbs (as one bank) with Pine Sol:
http://nighthawk-forums.com/index.php/topic,4472.0.html

I have been looking for this thread for forever.
 welcome ballinlikeabeave. I remember watching a video of a guy showing how to clean the carbs and he over-tightened the jet heads. The next few videos he posted was about him on a hunt to get new jets hahaha. Got any pictures of you bike puzzled aparat


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« Reply #8 on: September 13, 2010, 08:29:06 AM »

I didnt have the  time to completely disassemble all of the carbs,

Get the honda shop manual before going beyond the vacuum and float chambers. Don't ask questions or try to be cheap, just do it.  deal $30 for a real 79-82 honda CB650 manual with every bit of system information you'll ever need.

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I am no carb master, but I assume that when messing with parts that need to be so finely tuned like jets, I would assume its not good to go tearing up the ends.

Your assumption about not tearing them up would be correct.

Finely tuned jets? Ha! Those fuel pickups are nothing more than clean all the gunk out of all the holes, screw them in until they're snug then apply just a very tiny smidgen more torque to insure they won't back out. There is no adjustments on them. No breaker bar is needed to keep them in place though people think so for some reason.

The 'finely tuned' bit about carburetors is way overrated. There are precisely five components of the 310+ pieces on the VB44 carburetor design that has to be carefully set, other than that, there is not much you can screw up without being a gorilla with a sledge hammer and pry bar. There are lots of gorilla's out there with sledge hammers and pry bars. Most work in motorcycle shops and the rest don't use manuals.

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do you happen to have any explaining how to tune carbs as well?

I have two specific carburetor links on this site in the fuel, cooling and exhaust system that are stickied. Read them.
There are several other links discussing carburetor cleaning that can be found with the search option.

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I have been asking around and the common consensus is thati can either attempt it myself( which I would like to learn anyway) or cut off my right arm and use it as currency.

Just your right arm? You must have found a very inexpensive shop. Most want your head and half the family of all your friends. The last I heard, a simple dunking in toxic chemicals is $300 and they won't touch it for any price to do a proper full teardown nit-pick cleaning.

Read the manual, look at the hardware, think for yourself. Then ask on this board as needed. We can talk you through it if you have any basic wrenching skills.

Step one: Forget the rebuild kit until you know exactly what you need. Most of the time, a simple disassembly, cleaning and reassembly is all that's necessary. Just pulling the top and bottom of the carburetor and cleaning there is enough. Depending on how bad it's gunked up, you may have to disassemble more or maybe replace parts though you won't know that until you get further into the cleaning process. Be very careful handling the air-T-connector hoses and expect to replace them soon and about every 5-7 years.


<--- resident VB44A/C wizard
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ballinlikeabeave Topic starter
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« Reply #9 on: September 13, 2010, 10:58:11 AM »

The shop manual has already been bought haha, so I guess that my next step is to just do it and not worry about it. Thanks guys I'll try to keep ya posted thanks again
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« Reply #10 on: September 13, 2010, 11:07:29 AM »

You can do it, it's not as bad as it seems.  Just take it one step at a time (AFTER you get the manual).
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« Reply #11 on: September 13, 2010, 11:11:18 AM »

The shop manual has already been bought haha, so I guess that my next step is to just do it and not worry about it. Thanks guys I'll try to keep ya posted thanks again

Just think carefully before you do things. There's a few pieces you can bend or break if you just start taking screws out and separating stuff.
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ballinlikeabeave Topic starter
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« Reply #12 on: September 16, 2010, 09:40:47 AM »

Once again thank for all the help guys. Where would be the best place to buy the t tubes?
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« Reply #13 on: September 16, 2010, 07:30:14 PM »

Once again thank for all the help guys. Where would be the best place to buy the t tubes?

Any self respecting motorcycle parts department can get them. They're $25-30 each and there's nothing you can do about it - though I have a few ideas for future experimentation. Since it's a high failure rate part and it involves separating the carburetors off the rack, replace both at the same time even if the other one doesn't need it yet.

Do you have the official 79-82 CB650 shop manual or one of the aftermarket manuals?
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ballinlikeabeave Topic starter
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« Reply #14 on: September 16, 2010, 09:17:50 PM »

I have the clymers, it was the only one I found on ebay, and in a quick google search.but I know exactly which ones youre talking about. I was checking to see if anyone had found a cheap way to acquire a set haha. Once again, thanks for the help
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