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post #1 of 8 Old 07-31-2011, 4:41 PM Thread Starter
 
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Carb sync question about a 1976 Honda CB200t

Hi all,
Been a while since I posted here, but I've continued to enjoy the lively conversations going on! I've come up against a carb sync question with my 76 Honda CB200t.

Because I don't have enough experience to do the carb tune/balance/sync by ear and feel, I purchased a Morgan Carbtune tool. I really want to be able to do a carb sync on my own, given how much any shop will charge me, but I'm not sure I'm doing it quite right. This bike has three places of adjustment--the mixture screws, the idle screws, and the carb-top adjusters (I've attached a picture, but I'm sure many of you are already familiar with this bike's set up or one similar to it!). I got the mixture screws set (no issue there). Then with the Morgan Carbtune hooked up, I adjusted the idle screws until both columns in the Carbtune leveled out and the idle was in the range it should be. Then, I rolled gently on the throttle to see if the two columns in the Carbtune were moving together. My thought was that this "test" would tell me if the two slides were moving together. When I started this part of the process, one column was rising, the other was falling when I rolled on the throttle. So, I started to adjust from the carb-top adjusters (a little hex adjuster located at the top of each carb where the throttle cable feeds in). Adjusting these got me to a point where both columns were moving together when rolling on/off throttle. Is that the proper way to do it? My adjustments to the carb-top adjusters didn't feel right, and I wound up with one being turned all the way in and one being out about 2-3 turns...

I haven't been able to find anything that discusses the adjustment of the carb-top adjusters. Typically, manuals and stuff only discuss mixture screws and idle screws...

Thanks a ton!
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1975 Honda CB200t, carb adjust spots.jpg‎  
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post #2 of 8 Old 08-23-2011, 9:42 PM
 
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Re: Carb sync question about a 1976 Honda CB200t

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Originally Posted by tonyd261 View Post
Hi all,
Been a while since I posted here, but I've continued to enjoy the lively conversations going on! I've come up against a carb sync question with my 76 Honda CB200t.

Because I don't have enough experience to do the carb tune/balance/sync by ear and feel, I purchased a Morgan Carbtune tool. I really want to be able to do a carb sync on my own, given how much any shop will charge me, but I'm not sure I'm doing it quite right. This bike has three places of adjustment--the mixture screws, the idle screws, and the carb-top adjusters (I've attached a picture, but I'm sure many of you are already familiar with this bike's set up or one similar to it!). I got the mixture screws set (no issue there). Then with the Morgan Carbtune hooked up, I adjusted the idle screws until both columns in the Carbtune leveled out and the idle was in the range it should be. Then, I rolled gently on the throttle to see if the two columns in the Carbtune were moving together. My thought was that this "test" would tell me if the two slides were moving together. When I started this part of the process, one column was rising, the other was falling when I rolled on the throttle. So, I started to adjust from the carb-top adjusters (a little hex adjuster located at the top of each carb where the throttle cable feeds in). Adjusting these got me to a point where both columns were moving together when rolling on/off throttle. Is that the proper way to do it? My adjustments to the carb-top adjusters didn't feel right, and I wound up with one being turned all the way in and one being out about 2-3 turns...

I haven't been able to find anything that discusses the adjustment of the carb-top adjusters. Typically, manuals and stuff only discuss mixture screws and idle screws...

Thanks a ton!
from what i can see in your posted pic..you only have one carb on that bike ?..if this is the case..your understanding of synching the carb is alittle out of bounds...lol..when it comes to synching carbs..this calls for more than one carb to adjust..or..in the real world..synch..which...means all carbs work at the same time..as in..all butter flies opening and closing at the same time..this is called synching the carbs. as for your bike..all you need to do is make sure your not running rich or lean..you do this by adjusting the main throat jet needle...it should have 5 grooves with a very small c-clip..most stock settings are with the c-clip in the middle groove. once this is done..you adjust your pilot screw jet needle out from lightly seated..back it out 2 1/2 to 3 turns, watch the groove on the screw head..count your turns out..just watch one end of the screw slot, once you do this..open and close the throttle..it should rise quickly..and drop back down in rpm's quickly..that is..if you got the settings right..this is what your shooting for.
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post #3 of 8 Old 08-23-2011, 10:18 PM Thread Starter
 
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Re: Carb sync question about a 1976 Honda CB200t

sorry--not a great picture. there's 2 carbs on this bike. just can't spot the other in this profile pic...
thanks for the response.
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post #4 of 8 Old 08-23-2011, 11:45 PM
 
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Re: Carb sync question about a 1976 Honda CB200t

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Originally Posted by tonyd261 View Post
sorry--not a great picture. there's 2 carbs on this bike. just can't spot the other in this profile pic...
thanks for the response.
ok..cool..as for your carbs..i see you have the old fashion types..these are easy to adjust..both operate from a cable that splits..they both raise the main jet needle out of the main jet..i can't tell if you have butter flies on these carbs ?..but if you do..they both should open and close at the same time..this is synching them..if you get this done..and then adjust your pilot/air to fuel mixture needles..it should run good. main thing is..getting the c-clips set the same..and your pilot/air fuel mixture needles turned out from lightly seated the same...if this is done right..your motor should run like a top. your carbs don't run/need any vaccum to operate the carbs..well..so to speak anyway..just set the carbs like i said..and you should be good to go..i've never used any after market carb synching tools..don't need them..i know the basics on how carbs work. try setting 4 of them on a v30 and v45 magna !!..now..thats fun !..lmfao.
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post #5 of 8 Old 11-12-2012, 6:13 PM
 
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Re: Carb sync question about a 1976 Honda CB200t

Tonyd261,
I know your post is old but was wondering where you hooked up the Morgan Carbtune to the carbs on your Honda CB200T. I'm thinking of buying a Carbtune also but can't see where to hook up for a vaccum port on the carbs on my 75 CB200T. Any help would be appreciated.
Thabnk you,
WOSCB200T
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post #6 of 8 Old 11-12-2012, 10:14 PM
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Re: Carb sync question about a 1976 Honda CB200t

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Originally Posted by woscb200t View Post
Tonyd261,
I know your post is old but was wondering where you hooked up the Morgan Carbtune to the carbs on your Honda CB200T. I'm thinking of buying a Carbtune also but can't see where to hook up for a vaccum port on the carbs on my 75 CB200T. Any help would be appreciated.
Thabnk you,
WOSCB200T

Are there any plug screws in the intake manifolds?
Part# 16 perhaps?
Ronayers.com Microfiche Honda>Motorcycle>1975>CB200T>CYLINDER @ CYLINDER HEAD

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post #7 of 8 Old 11-13-2012, 12:52 PM
 
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Re: Carb sync question about a 1976 Honda CB200t

Bladeracer,
Thank you for the info! I was only looking at the left side of the left carb and missed the screw hidden behind the manifold by the head. Now I will be able to tune as I should. Thank you again!
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post #8 of 8 Old 11-13-2012, 2:15 PM
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Re: Carb sync question about a 1976 Honda CB200t

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Originally Posted by woscb200t View Post
Bladeracer,
Thank you for the info! I was only looking at the left side of the left carb and missed the screw hidden behind the manifold by the head. Now I will be able to tune as I should. Thank you again!

You'll need to make a couple of adaptors if you don't have them. Either tap a thread onto some small tube or drill through some bolts that fit.

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