Author Topic: Removing Needles and Slides on 657B Carbs  (Read 533 times)

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Offline PGF550F

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Removing Needles and Slides on 657B Carbs
« on: July 15, 2015, 11:03:52 AM »
So I have searched and seem to be getting inconsistent information.

I want to remove the needles and slides to check them out and clean them. I already removed the bowls, jets, floats, etc from the bottom end.

How do you remove the needles and slides? The manual says that you have to remove each carb from the rack by disconnecting the individual choke rods and the 2, 6mm screws on the stay plate. Then separate the carburetors.

This would mean you would be disconnecting the fuel line "T"s and the crossover tubes as well.



There has to be a better way to do this, I dont really want to separate each carb just to clean, check and reinstall the needles and slides. Is there an easier way to do this? Is there a way to remove the lifter arms out of the way to get the tops free? That really is the only thing interfering with the removal. The tops just unscrew and are free but the lifter arms are stopping me from getting the slides up and out.


Oh and yes I know that I need a new throttle return spring and need to clean off all that gunk from the outside, the internals are in great shape after I opened up the bottom to clean them. These were my before photos and I havent taken any more since taking them off the bike.


Offline Johnie

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Re: Removing Needles and Slides on 657B Carbs
« Reply #1 on: July 15, 2015, 01:21:06 PM »
You can remove the rack stay plate by the 8 phillips screws and just slide the arms and rack off the carbs. You do not need to remove the T's or choke linkage for this...but removing the T's and replacing the o-rings after 40 years would be a good idea...or you can do it later after they start to leak. So much easier to do it now. Fuel T o-rings I get at NAPA part #727-2605
« Last Edit: July 15, 2015, 01:23:51 PM by Johnie »
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 PGF550F

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Re: Removing Needles and Slides on 657B Carbs
« Reply #2 on: July 16, 2015, 02:03:01 PM »
Right On!! I was looking at the rack and wondering why I couldn't take out all 8 screws and disconnect the spring and then lift off the stay plate. For some reason I was thinking of removing 1 carb at a time. I think I have got this figured out now, Thanks for the reply, Ill be sure to put in new o-rings, I guess I was just intimidated by the idea of breaking down the rack... Not soo bad now that I think of it.


Offline Johnie

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Re: Removing Needles and Slides on 657B Carbs
« Reply #3 on: July 16, 2015, 03:48:15 PM »
Once you get it back together check your chokes to be sure the plates close all the way when you choke it. Seems some of the Honda techs at the plant were not to careful with this.
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