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Author Topic: 1978 CB750 jetting  (Read 1102 times)

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Offline lucky

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1978 CB750 jetting
« on: April 24, 2012, 03:42:59 PM »
OK...Here is the run down.

1978 CB750.
Stock air filter. Stock air box.
4 into 2 into 1 exhaust with baffle.
#42mm idle jet.
#120 main jets.
( Stock idle jet#35mm would not work with this exhaust.)
No shims on the needle.
Mixture screws open 7/8 turn open
Excellent throttle response.
Still need carb sync. & road test.





« Last Edit: April 24, 2012, 09:23:17 PM by lucky »
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Offline I Zombie

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Re: 1978 CB750 jetting
« Reply #1 on: April 24, 2012, 04:14:15 PM »
what mains are you running again Lucky?
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78 CB750K

Offline lucky

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Re: 1978 CB750 jetting
« Reply #2 on: April 24, 2012, 09:22:51 PM »
Quote from: I Zombie on April 24, 2012, 04:14:15 PM
what mains are you running again Lucky?

Oh, sorry I broke my own rule(leaving out vital information.)

They are #120 main jets

I am near sea level too.
It is good insurance against an overheated brand new engine.
« Last Edit: April 24, 2012, 09:24:33 PM by lucky »
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Offline lucky

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Re: 1978 CB750 jetting
« Reply #3 on: May 03, 2012, 01:46:48 PM »
The road test with this set up (post#1) got excellent results.
Ran good on the road and in the shop.

Next step...Will a #40 idle jet work better? We shall see.
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