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Honda CB750/900/1100F SuperSport Website: SuperSport Forums


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RickP
MB-5
MB-5



Joined: Sep 02, 2019
Posts: 7
Location: Weston Florida

PostPosted: Thu May 21, 2020 12:42 am Reply with quote Back to top

Hello All
i do have an dead VB56A carburator from a CB1100 mounted on my CB900F 1981...To many time up and down, changing this, trying this... yes air pod are mounted as well and they are a pain, but got to move forward and no more air box..
Either way, it is dead, so i decide to scrap it and replace it with either an CR or an Mikuni, i believe after reading both carb are good quality.
so now if anybody knows what size of CR carb i need for a CB900F is is an CR33 or the CR35? on the web site it is mention that it works for both model!!
and about a Mikuni RS, will it be the RS34-D21-K, the RS36-D3-K or the RS38-D19-K ?
i mean i measure the engine side carb inside measurement and it is 37 mm, but again they are from a CB1100 or else..
I welcome all feedback.
thank you all..
 
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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11034
Location: Studio City, California

PostPosted: Thu May 21, 2020 2:13 am Reply with quote Back to top

On an otherwise stock 900 I'd recommend a CR31. Or CR33 if you're going to be hotrodding it. With flat slides you can go a size larger.

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RickP
MB-5
MB-5



Joined: Sep 02, 2019
Posts: 7
Location: Weston Florida

PostPosted: Thu May 21, 2020 3:35 am Reply with quote Back to top

Ok thanks for the info, so an CR 31 will fit my 1981 CB900F if not with Mikuni the RS 34 should do it, as long as the rack are adjustable correct?
 
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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11034
Location: Studio City, California

PostPosted: Thu May 21, 2020 4:01 am Reply with quote Back to top

The CRs have adjustable spacing, the RSs don't, and they aren't spaced correctly for our motors, but these guys make a kit:

https://www.mikunioz.com/shop/re-spacing-kit-for-mikuni-rs-34-carb-honda-cb750-cb900-cb1100/?v=7516fd43adaa

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AlaskaGriz
Friend of the Board
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Joined: Nov 04, 2005
Posts: 7615
Location: Anchorage, Alaska

PostPosted: Thu May 21, 2020 4:23 am Reply with quote Back to top

RickP wrote:
Ok thanks for the info, so an CR 31 will fit my 1981 CB900F if not with Mikuni the RS 34 should do it, as long as the rack are adjustable correct?
I have CR31s on my Stock (other than 4:1 Pipe) CB900F.

They run rich (at crusing and eventually foul the plugs) even with correct jetting so, the fix is to add CBR Coils and a Coil Relay Mod. This way you can get a stronger spark. I even gapped my plugs according to CBR specs. Rich condition is gone.

They look really good too...

Dave

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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11034
Location: Studio City, California

PostPosted: Thu May 21, 2020 4:57 am Reply with quote Back to top

Yep, still love that bike Dave Wink

And I agree, using better carbs necessitates upgrading the ignition system at least with coils and a relay.

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Simonster
Twinstar
Twinstar



Joined: Jun 03, 2004
Posts: 116
Location: Sunshine Coast, Qld

PostPosted: Thu May 21, 2020 8:07 am Reply with quote Back to top

I have an 1123 running CR33s, and it's awesome! On a stock 900, 31s. The ignition system will be the next weak point to change.

Happy spannering !

Simon
 
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krgood0
CB1100F
CB1100F



Joined: Jun 18, 2006
Posts: 2447
Location: UK

PostPosted: Thu May 21, 2020 8:53 am Reply with quote Back to top

RickP wrote:
Hello All
i do have an dead VB56A carburator from a CB1100 mounted on my CB900F 1981...To many time up and down, changing this, trying this... yes air pod are mounted as well and they are a pain, but got to move forward and no more air box..
Either way, it is dead, so i decide to scrap it and replace it with either an CR or an Mikuni, i believe after reading both carb are good quality.
so now if anybody knows what size of CR carb i need for a CB900F is is an CR33 or the CR35? on the web site it is mention that it works for both model!!
and about a Mikuni RS, will it be the RS34-D21-K, the RS36-D3-K or the RS38-D19-K ?
i mean i measure the engine side carb inside measurement and it is 37 mm, but again they are from a CB1100 or else..
I welcome all feedback.
thank you all..


The stock carb size is measured near the needle in the venturi not where if fits to the engine

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1982 CB1100RC
1982 CB1100RC
1983 CB1100F/R rep
1998 CBR900RRW
1981 CB985 
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smurdoch
CB1100F
CB1100F



Joined: Jan 22, 2004
Posts: 2969
Location: St. Catharines, Ontario

PostPosted: Thu May 21, 2020 10:17 am Reply with quote Back to top

genesound wrote:
Yep, still love that bike Dave Wink

And I agree, using better carbs necessitates upgrading the ignition system at least with coils and a relay.


Yup, Black Beauty in all it's splendor.

Dave, what boots and spacers are you using with the CRs.
 
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AlaskaGriz
Friend of the Board
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Joined: Nov 04, 2005
Posts: 7615
Location: Anchorage, Alaska

PostPosted: Thu May 21, 2020 3:50 pm Reply with quote Back to top

smurdoch wrote:
genesound wrote:
Yep, still love that bike Dave Wink

And I agree, using better carbs necessitates upgrading the ignition system at least with coils and a relay.


Yup, Black Beauty in all it's splendor.

Dave, what boots and spacers are you using with the CRs.


Thank you. I still love it too. LOL

Boots are stock and spacers came with the Carbs from Dynoman (carbs were already jetted and spaced for my bike right out of the box).

Dave

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RickP
MB-5
MB-5



Joined: Sep 02, 2019
Posts: 7
Location: Weston Florida

PostPosted: Thu May 21, 2020 6:47 pm Reply with quote Back to top

Beautiful bike Dave, wow..
question with the CR i guess you had to change as well the push/pull throttle assy no? so basically change the left command..
 
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AlaskaGriz
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Joined: Nov 04, 2005
Posts: 7615
Location: Anchorage, Alaska

PostPosted: Sat May 23, 2020 9:01 am Reply with quote Back to top

RickP wrote:
Beautiful bike Dave, wow..
question with the CR i guess you had to change as well the push/pull throttle assy no? so basically change the left command..


Rick,

I didn't have to change anything. These are Plug-n-Play. But....... need to improve the spark with the mods I mentioned.

Dave

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