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jetting the carbs on a cb750 honda

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Don Cermak
L Plate Warrior



Joined: 14 Mar 2015
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PostPosted: 01:34 - 25 Mar 2015    Post subject: jetting the carbs on a cb750 honda Reply with quote
Has anyone had any experence in useing the 6sigmajrt kits in jetting there carbs? I have been trying to jet mine and have had nothing but trouble. they sent me #42 slow jets and the bike just will not run it will not even start with these jets, the stock jet it a #40 They also advise jetting the two outside cyl with one size main jet #122.5 and the two middle cyl with a larger jet #125 is this right or should they be all the same like the stock set up?I tried several combos but the bike still bogs at times Any help and advice is appreciated
Thanks Don
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sickpup
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Joined: 21 Apr 2004
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PostPosted: 02:29 - 25 Mar 2015    Post subject: Re: jetting the carbs on a cb750 honda Reply with quote
Don Cermak wrote:
6sigmajrt


Who?
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temeluchus
World Chat Champion



Joined: 01 Oct 2008
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PostPosted: 08:18 - 25 Mar 2015    Post subject: Reply with quote
https://www.6sigmajetkit.com/ i'm guessing?

Are you stock? Pod filters? Pipe? Ordered the correct kit? What year cb750?
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Don Cermak
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Joined: 14 Mar 2015
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PostPosted: 00:12 - 01 Apr 2015    Post subject: Reply with quote
temeluchus wrote:
https://www.6sigmajetkit.com/ i'm guessing?

Are you stock? Pod filters? Pipe? Ordered the correct kit? What year cb750?

The bike is a 71 k1 honda stock with a stock air box a hooker 4-1 header with baffel the kit is supose to be tailered for my bike but it doesn't run as they say. I have contacted them and they keep telling me differen't thing to try some make it run worse and sometimes i get the impression that they are working on a differen't model. All things aside do you have any suggestions on how to jet this bike?
Thanks Don
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Don Cermak
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Joined: 14 Mar 2015
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PostPosted: 00:23 - 01 Apr 2015    Post subject: Re: jetting the carbs on a cb750 honda Reply with quote
sickpup wrote:
Don Cermak wrote:
6sigmajrt


Who?
It is a 6sigmajet kit it is suppose to be tailered just for your specific bike and altitude, but it does not seem to work for me. Do you have any suggestions on jetting a 71 k1 honda four stock bike with a hooker 4-1 header with baffel?
Thanks Don
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sickpup
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Joined: 21 Apr 2004
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PostPosted: 00:31 - 01 Apr 2015    Post subject: Reply with quote
It won't run as they say. By the website its meant for the US market with different spec bikes and fuel.
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Major Doss
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Joined: 09 Jan 2014
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PostPosted: 00:52 - 01 Apr 2015    Post subject: Reply with quote
Not wishing to send you elsewhere (welcome, btw), there has to be a Stateside CB forum that would be more suited to the question? Personally, I would keep on at the vendor/manufacturer. When they give you the money back, go and see a bike dyno specialist. Good luck, and keep us posted! Thumbs Up

PS, what is a 'hooker' system? Thinking Shocked
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Major Doss
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PostPosted: 00:59 - 01 Apr 2015    Post subject: Reply with quote
As an aside, are you sure the problem actually lies with the jetting kit? Inlet manifolds not split, carburetors (US sp) unworn, ignition good, valves sweet, fresh fuel, etc?
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temeluchus
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Joined: 01 Oct 2008
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PostPosted: 04:49 - 01 Apr 2015    Post subject: Reply with quote
In addition to what is said above,

https://www.bike-parts-honda.com/a_pieces.php?num_moto=50003&ref_vue=e26&MODEL=CB750K1-A-D-E-U

Stock mains are 120. Stock idles are as you say 40.

Was it running fine stock? Did the kit get you to drill the slides? Have you set the idle screws? Points adjusted correctly?

Stock airbox with an aftermarket pipe with baffle fitted shouldnt be much richer than stock. 125, two jet sizes is quite a bit richer. If you have them, try the stock jetting.
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Old Thread Alert!

The last post was made 9 years, 28 days ago. Instead of replying here, would creating a new thread be more useful?
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