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Sunday, 5 June 2011

weber carb jetting for cb750.here it is!

I found my old book on carb jetting info ,these are the jets i used in my Weber's on a cb750 sohc 750 ,then a 960 version ,these work well i have proven them to be good 
RC ENGINEERING WEBER 40 SIDE DRAUGHT CAR BS CB750
idle jets 45f9
air correctors 150
main jets 120 (145 960cc)
emulsion tubes f16
venturies 32mm

6 comments:

  1. More photos, more info!

    This is a very cool setup, I don't see many carburetor swaps on the old Hondas. I wish I had a better carburetor setup for my 78 550. The stock rack has only been a pain since the beginning.

    Brady
    Behind Bars - Motorcycles and Life
    http://www.behindbarsmotorcycle.com/

    ReplyDelete
  2. What (exactly) kind of webers??? 40 dcoe what? Tx Bri

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  3. Forget about running anything on the 1977-78 cB550 or 750's except the stock air box.!
    I worked on a CB750 for months to get the carbs to work with stacks or pods. Forget it.!!

    The stock air box limits the intake area to 39% of the total area of the actual carb openings.
    The air box is like a giant choke.

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  4. i have worked on cb s for 30 yrs and ran webers and amals and smoothbores on them,also SU carbs ,i also ran a 1000cc Russ Collins sb750 drag motor on th street,a cb750 /960cc supercharged honda 750 ,so i think i know what i am talking about ,its all a matter of jetting and engineering and i have ran all of these bikes with no problems,cb750s with standard carbs and no airbox will work fine with a 10% increase on the main jets as do cb550 s ,im on my 16th cb750 at the moment

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  5. 30mm chokes? Ive got this on a stock cb750a, and its not close:

    32mm chokes
    4.5 Aux Venturi
    F16 Emulsion Tube
    125 main
    45F8 Idle jet
    60F5 starter jet
    35 pump jet
    Pump Spill 55 (what is stamped)
    .200 needle valve
    150 AIR CORRECTOR JET

    ReplyDelete