Vintage and Classic Hondas

!977 cb750k carbs

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hood624

Re: !977 cb750k carbs

800-900 prm its while idling

Lucky 1

Re: !977 cb750k carbs

In reply to this post by hood624

NO- that is the wrong needle it has no adjustments.
You want the needle that has 5 grooves in it . That way you can adjust the clip
into one of the 5 grooves.

On a Roadstar Adventure.

Lucky 1

Re: !977 cb750k carbs

In reply to this post by hood624

Do you have a slide needle with 5 grooves on it?

Confusing.

On a Roadstar Adventure.

hood624

Re: !977 cb750k carbs

yes the needle i bought has the five groves that you adjust by moving the clip i had it in the middle slot with the 42slow and the 120main had the air filters on sync the carbs to almost perfect and had the air screw out 1 turn on all and it running rich do i need to change the setting on the needle or what

TOOLS1

Re: !977 cb750k carbs

Administrator

At 800-900 RPM you are running on the pilot jet. The bike should idle at 1100 +/- 100. You could try moving the clip up one notch, and try it, but I am thinking the pilot jets are the problem. They might have been drilled out by a PO before you got it.
TOOLS

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" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

shinyribs

Re: !977 cb750k carbs

Administrator

800-900 rpm is a pretty low idle. More idle speed (I like about 1200 rpm) supplies much better oil pressure to the engine while idling. It also helps the clutch to disengage better. I dont really know why,but it does.

Lucky 1

Re: !977 cb750k carbs

In reply to this post by hood624

If you have a stock intake set up and only the exhaust has changed ,then the slide needle should be in the stock position which is the first groove down from the top. Not the third groove down from the top.

On a Roadstar Adventure.

Lucky 1

Re: !977 cb750k carbs

Do you have the stock air box?
Do you have the stock air filter?
Do you have stock exhausts or aftermarket exhausts?

Need some facts.

On a Roadstar Adventure.

hood624

Re: !977 cb750k carbs

its the uniflow foam pod filters and 4-1 header with vance and hine pipe

hood624

Re: !977 cb750k carbs

In reply to this post by TOOLS1

tools1 i bought the jet new off ebay some place out of a place called S.C.I is there anyway to check and make sure they have not been tinkered with