250 bogging down under full throttle. - Honda Rebel Forum
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post #1 of 15 Old 06-26-2011, 03:18 PM Thread Starter
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250 bogging down under full throttle.

When I was trying to get this beast running last night I noticed a floating cylinder in the carb Troat. Does this move up under vacuum? Reason I ask is that we have drained the bowl, new premium gas. New gas filter. As the header states she tops at 55 and needs to be feathered to get there. Also added gumout.
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post #2 of 15 Old 06-26-2011, 03:29 PM
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Was it parts 10, 2 and 17 in this diagram? OEM Parts Honda REBEL 250 LIMITED (CMX250CD) 1986 CARBURETOR - Cheap Cycle Parts

If yes, then the answer to your question is yes.

No need to put premium in it. Honda recommends a minimum of 86 octane and they run fine on 87. Sounds to me like a carb or air filter issue. Has the puke tube been drained lately, and is the air filter clean?

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post #3 of 15 Old 06-26-2011, 03:35 PM
 
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the throttle slide moves up and down which moves the needle in the carb. If the diagram is not seated right the slide will not move properly. If that's not the problem than you have dirty carb jets. I would try to run seafoam through it and see if that helps. If not you may need to tear it down and give it a good cleaning. Also premium gas is a waste of money in the Rebel.

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post #4 of 15 Old 06-26-2011, 07:58 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
Was it parts 10, 2 and 17 in this diagram? OEM Parts Honda REBEL 250 LIMITED (CMX250CD) 1986 CARBURETOR - Cheap Cycle Parts

If yes, then the answer to your question is yes.

No need to put premium in it. Honda recommends a minimum of 86 octane and they run fine on 87. Sounds to me like a carb or air filter issue. Has the puke tube been drained lately, and is the air filter clean?
Drained, and very clean.
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Originally Posted by B-Rock View Post
the throttle slide moves up and down which moves the needle in the carb. If the diagram is not seated right the slide will not move properly. If that's not the problem than you have dirty carb jets. I would try to run seafoam through it and see if that helps. If not you may need to tear it down and give it a good cleaning. Also premium gas is a waste of money in the Rebel.
Jets- I hope. This part DOES NOT move up and down with throttle twist. It slides efortlesly with a screwdriver though. Rumor hasd it an idiot worked on the carb so I'm thinking about buying one new. LOL.
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post #5 of 15 Old 06-26-2011, 08:10 PM
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The Rebel carb is of the CV type. Vacuum moves the slide up and down, but only if the diaphragm is properly seated and not torn.




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post #6 of 15 Old 06-26-2011, 09:29 PM Thread Starter
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The Rebel carb is of the CV type. Vacuum moves the slide up and down, but only if the diaphragm is properly seated and not torn.
Aha... so it acts as a simple decell circuit... I could check the diphragm..... Hmm... Is there a place to get a whole new carb? Who sells the best kit in your opinion?
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post #7 of 15 Old 06-26-2011, 09:40 PM
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Not exactly. Its a variable venturi dependent on demand sensitive to vacuum.

Getting a whole new carb is an expensive proposition. They don't wear out and are far more readily overhauled than an automotive carb. Kits for overhaul can be had if it truly needs it. I've always gotten my kits from the dealer.
Jack's Rebel Warehouse is a good source for used parts.




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post #8 of 15 Old 06-26-2011, 09:49 PM Thread Starter
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I gotcha... Like a snowmobile. Keeps intake velocity consistent to smooth out peaks in the torque curve/ air fuel ratio. Ive found that on any carb that uses any kind of diaphragm that they sit they rot they crack. If carb cleaner doesnt work ill take a peak. Thanks.
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post #9 of 15 Old 06-26-2011, 09:59 PM
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Yep, that's it.




1987 CMX250C Rebel
2002 FSC600 SilverWing
1983 Yamaha Midnight Virago XV920MK
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post #10 of 15 Old 06-27-2011, 11:25 PM
 
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I have the opposite issue, when i hit the throttle and go to shift, my rpm's increase rapidly. I ruled out the clutch, so wat can be wrong with the carb? pilot circuit issues? What prevents the bike from going bak to idle once throttle is hit?
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