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79 KZ650 carb rebuild question 11 Oct 2005 14:25 #754

  • medic24
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Have thoroughly "ibbyized" my carbs and I am wondering what is the recommended position for the air screws? ie how many turns out????
Thanks
Dave

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79 KZ650 carb rebuild question 11 Oct 2005 14:32 #755

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Sorry, I didn't know we now had a carb forum

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79 KZ650 carb rebuild question 11 Oct 2005 14:50 #759

  • GargantuChet
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Clymer recommends 1 1/8 turns out as a starting point. I just did mine this weekend, with help from a friend.

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79 KZ650 carb rebuild question 13 Oct 2005 18:46 #1506

  • Idaho_Spud
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I just adjusted the air mixture screws on my 1979 KZ650 B3. The owner's manual calls for you to seat them lightly, then open them 1 5/8 turns.

They were running pretty rich before this adjustment - the exhaust smelled like half-burnt gasoline, and it backfired when I backed off the throttle. Since making this adjustment, no stinky exhaust, and no backfires either.

Hope this helps!

Post edited by: Idaho_Spud, at: 2005/10/13 21:47

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79 KZ650 carb rebuild question 13 Oct 2005 19:29 #1527

  • GargantuChet
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Hmm... Page 142 of my Clymer manual says:

"21. On pilot screw models, turn pilot screw in carefully until it seats lightly, then back it out 1 1/8 turns. Install the limiter onto the pilot screw with tab pointing towards the front (Figure 25)." (emphasis and italics theirs)

I might be unclear about what everyone is calling air screws. This is the screw on the bottom of the carb, towards the front (from Figure 25 on page 142).

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79 KZ650 carb rebuild question 13 Oct 2005 20:06 #1546

  • DanOz7Five0
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GargantuChet wrote:

Hmm... Page 142 of my Clymer manual says:

"21. On pilot screw models, turn pilot screw in carefully until it seats lightly, then back it out 1 1/8 turns. Install the limiter onto the pilot screw with tab pointing towards the front (Figure 25)." (emphasis and italics theirs)

I might be unclear about what everyone is calling air screws. This is the screw on the bottom of the carb, towards the front (from Figure 25 on page 142).


There can be 2 different sets of screws. If your screws are on the bottom of the carbs tucked in by the float bowls, those would be called idle FUEL screws. If you have screws above the bowls in the main carb body those would be called idle AIR screws. The pic below shows where air screws are located.

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79 KZ650 carb rebuild question 13 Oct 2005 21:08 #1574

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Thanks for clarifying! It seems that many terms are often used for the same part (pilot screws vs. fuel screws, for instance), and it's sometimes confusing. I really appreciate the picture, as I don't think my carbs have the air screws.

Thumbs up to ye! B)

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79 KZ650 carb rebuild question 14 Oct 2005 02:32 #1618

  • Idaho_Spud
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Yep thanks! Those are the screws that I tweaked a bit.

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