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Author Topic: Jetting  (Read 1121 times)

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Tom H

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Jetting
« on: September 10, 2005, 06:49:26 AM »
I just installed a 4 into 1 mac header on my 1976 cb 750 and was wondering how to dtermine if I need to rejet the carbs. and If
I do rejet do I change both jets? :)

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Offline MikeDeB

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  • Posts: 220
Re: Jetting
« Reply #1 on: September 10, 2005, 07:52:49 AM »
If you installed an unmodified MAC of recent manufature, still have the stock airbox in place with a stock filter then you probably can get by without rejetting.  At the most you may have to go from 105 mains to 110 mains.  You really shouldn't have to change the slow jets.  Now if you've opened the baffle up in the MAC and/or modified the air intake (such as drilled airbox or pod filters) then you'll have to increase the size of the main jets.  I have a modified MAC with pods on my K2 and am running 135 mains with stock slow jets (40).  Hope this helps.
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Mike (Old SOHC/4 #2641)
Holt, MI
71 CB750K1
72 CB750K2
72 CB100K2
97 Ducati 900 SS/SP w/FCRs
98 Ducati 750 Monster w/FCRs
80 SR500

"Growing older is inevitable, growing up is an option."

Tom H

  • Guest
Re: Jetting
« Reply #2 on: September 10, 2005, 02:41:28 PM »
Thanks for the reply Mike. I am running the stock air filter and currently have the baffle installed but I would like to get a little more
sound out of the mac exhaust and I'm not sure how to modify it. I was wondering about drilling some holes in the tube inside the
baffle. any suggestions would be appreciated.
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