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CB200 Carb Sync & Float Level Tips?

19319 Views 21 Replies 7 Participants Last post by  66Sprint
OK, how 'bout listing up your favorite methods for syncing the carbs on a CB200 (independent slides) and for setting / checking the float levels.

I've had to completely disassemble, clean and soak the carbs on my '74 CB200 - standard rebuild technique. My synchronizing style is to bench-sync them first, just by eyeballing the gaps beneath the throttle slide and trying to make 'em the same. But, I have no idea where this will leave the idle speed setting.

Next, though, is connecting the two separate cables to the slides and trying to set free play. Here, I just try to sync them so that I can just hear the slight "click" the slides make as they close and try and get 'em together. But, my ears aren't as good as they once were... :)

But this is kinda crude. Anyone got any better suggestions? Anyone drilled & tapped the manifolds for using a mercury-type carb synchronizer?

How 'bout setting float level on these? Anyone fabbed a screw to thread into the bowl drain and connect a clear tube to check actual level? I guess I should start with the manual, to see what it actually says about setting float level... :oops:

Thanks for any tips and techniques.

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Hi Kirkn-CB200 here I've got your problem and you may have the same issue I did. A small hand full of the very earlest CB200's used different jets than the rest. If over the years the carbs were replaced or rebuilt and the more common #38 & #88 jets were used instead of the #35 & #95 -- carb tuning is like splitting a hair. It can be done but you need to set the floats to almost the point were they bottom out before opening. Then set the needle pin for the main jet to the deepest setting. Then tune the air/fuel at idle best you can. It will then-with the fuel valve shut off, rev up just before the fuel in the carbs run out---but it will tune quite nice other than just how close the float level is to bottoming out. If you can locate the #35 idle jets and the #95 mains then it tunes normal. A crafty home craftsman can ream the #88 main jets to 95, but the idle is out of the question.
Another tune issue-- due to the stops on the slides being independently adjustable one needs to mount the carbs to the motor and look at the amount of opening of the slides at idle and match them first (via the idle speed adjustment screw) then check if they close at the same time- but you may have already figured this one.
It's lip to float bottom-but if you have that jet issue it's more like 22 to 24 and ream the main--what is your motor's serial #?
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The one photo I have shows the lip but it is a poor manual. I was never able to get the carb to tune real good at early progression untill I found out about the alternative idle jet and got a set. Now that I have the jets worked out I'll try setting the float to the seat rather than the lip.
I found the alternate jetting by way of a parts supplier's parts list. According to their list the alternate jetting was only for a few of the first production run 200's--- I am interested in the manual that the drawing came from--looks better than any I've got.
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