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


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1100russ
CB1100F
CB1100F



Joined: May 17, 2010
Posts: 3007
Location: williamsburg, ohio

PostPosted: Tue Sep 03, 2019 3:16 pm Reply with quote Back to top

Fuck an airbox! Biggest pita on these bikes. Good job dude.

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jacksondee
Hawk
Hawk



Joined: Jul 30, 2013
Posts: 302
Location: Chicago

PostPosted: Tue Sep 03, 2019 3:20 pm Reply with quote Back to top

I'm fascinated that the difference between 100 and 120 is what, .2mm? And that's what makes a significant difference? Has anyone ever actually verified that carbs don't run on some kind of black magic?

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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11768
Location: Studio City, California

PostPosted: Tue Sep 03, 2019 4:32 pm Reply with quote Back to top

bernoulli, the art and science of sucking

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melchiro
Silver CB900F
Silver CB900F



Joined: Aug 10, 2003
Posts: 1511
Location: Mill Creek, WA.

PostPosted: Tue Sep 03, 2019 8:03 pm Reply with quote Back to top

jacksondee wrote:
I'm fascinated that the difference between 100 and 120 is what, .2mm? And that's what makes a significant difference? Has anyone ever actually verified that carbs don't run on some kind of black magic?


.2mm is A HUGE amount, when you are measuring the amount of gasoline flowing through the ports...

1100russ, Iím on the same boat as you, concerning the air box. LOL

Bernoulli, that fairly sums it up, eh..

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pickandpray
Twinstar
Twinstar



Joined: Apr 04, 2009
Posts: 49
Location: Northwest Arkansas

PostPosted: Sun Dec 15, 2019 2:46 pm Reply with quote Back to top

sorry for reviving this thread, but I didn't see anyone recommend the number of turns for the air mix screws with these jetting changes and 38 slow?
 
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jacksondee
Hawk
Hawk



Joined: Jul 30, 2013
Posts: 302
Location: Chicago

PostPosted: Mon Dec 16, 2019 7:40 pm Reply with quote Back to top

pickandpray wrote:
sorry for reviving this thread, but I didn't see anyone recommend the number of turns for the air mix screws with these jetting changes and 38 slow?


I'm pretty sure I'm at the recommended 2.5 turns out. I have the exact set up as you with the one-size-larger 38 jet

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djf18374
Silver CB750F
Silver CB750F



Joined: Oct 14, 2016
Posts: 628
Location: Richmond, VA

PostPosted: Wed Jul 21, 2021 1:09 pm Reply with quote Back to top

I searched around a bit on here for recommendations on jetting for Pods. Figured I would share my success here for others to have as a data point:

1983 CB1000C with the stock carbs for that year, Uni-foam pod filters that do not block the carb inlet ports.

Pilot Jets: 38

Needles: CBX needles

Primary Main: 72

Secondary Main: 130

Turns on Mix Screw: 1.25

It is still a little rich at idle, so I'm going to assume I could go in further with the mix screws. They still have the little flag things on the screw so I cannot go in any further at this time.

Hope this helps someone else to succeed without the airbox.

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smurdoch
CB1100F
CB1100F



Joined: Jan 22, 2004
Posts: 3148
Location: St. Catharines, Ontario

PostPosted: Thu Jul 22, 2021 1:19 am Reply with quote Back to top

Removing the tabs from the mixture screws is not a difficult proceedure.
Mike Nixon uses a soldering iron to heat up the glue holding them on.
A short video.
https://www.youtube.com/watch?v=ZpMy4W6yx3Q

Another method which i used is a small torch and melt the tab itself.
https://www.youtube.com/watch?v=XzlWPpjcYoA
 
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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11768
Location: Studio City, California

PostPosted: Thu Jul 22, 2021 1:28 am Reply with quote Back to top

pickandpray wrote:
sorry for reviving this thread, but I didn't see anyone recommend the number of turns for the air mix screws with these jetting changes and 38 slow?


Chi, old post, but once you've removed the airbox and changed a bunch of other stuff to compensate, I'd recommend you set your mixture using exhaust gas analysis or use a Gunson Colortune. Too many variables at that point to just say set it like this IMO.

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phoenix655
MB-5
MB-5



Joined: May 08, 2019
Posts: 23
Location: BC

PostPosted: Mon Oct 03, 2022 11:30 pm Reply with quote Back to top

Does the bike run smoothly at low RPM/load just cruising around with the pods and this jetting?
 
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djf18374
Silver CB750F
Silver CB750F



Joined: Oct 14, 2016
Posts: 628
Location: Richmond, VA

PostPosted: Mon Oct 03, 2022 11:48 pm Reply with quote Back to top

phoenix655 wrote:
Does the bike run smoothly at low RPM/load just cruising around with the pods and this jetting?


Are you asking the question of me?

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