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Author Topic: 750 K5 carb rebuild question  (Read 1117 times)

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Offline Harper

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750 K5 carb rebuild question
« on: January 11, 2010, 05:43:52 pm »
Hi everybody,

I'm rebuilding my carburetors. The rebuild kit air screws have no hole, but the originals do. Like this:
http://www.salocal.com/sohc/tech/carb/dspg_mgs/a-fladjstr.jpg

Does anybody know if this is an important difference? Can I put in the new ones?


A second question:
the slow running jet provided by the rebuild kit has significantly smaller hole than the stock jet. Again, is this an important difference? Will I have to change other settings to compensate?

Thanks

Harper

« Last Edit: January 11, 2010, 06:25:56 pm by Harper »
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1975 CB750

Offline TwoTired

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Re: 750 K5 carb air screw question
« Reply #1 on: January 11, 2010, 05:46:11 pm »
You can put in the new ones.  But the stock pilot screw setting will no longer apply.  You have to find the proper setting through tuning.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Harper

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Re: 750 K5 carb air screw question
« Reply #2 on: January 11, 2010, 06:21:49 pm »
OK thanks
I may just stick with stock then

Harper
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Offline TwoTired

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Re: 750 K5 carb rebuild question
« Reply #3 on: January 11, 2010, 06:35:55 pm »
Slow jet sizes are stamped on the jet with a number indicating their orifice size.
What number jets are you comparing?

If those numbers or the orifice size that is represented differ, then fuel delivery rates are altered.
The ends of the jets are NOT where the metering orifice is located.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Harper

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Re: 750 K5 carb rebuild question
« Reply #4 on: January 12, 2010, 11:54:25 am »
Oh, I see. I didn't understand that before.
They are both stamped 40, so the new ones should be fine.

Thank you,

Harper
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1975 CB750
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