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Carb Bench Alignment - does this look correct?

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Carb Bench Alignment - does this look correct?

7 hours ago - 6 hours 58 minutes ago
#34880
 2026-06-18 SG3 Final Alignment
Learning how to correctly set up these carburetors has been a painful experience.
I think I'm getting better though.

A delicate balance of a complex mechanical system as each adjustment interacts with another.

Posting this to KZ1300 forum in hopes Scotch or KawBoy or other more experienced person can provide feedback.
 

A small gap between the choke cam and roller.
 

Butterfly adjustment via synchronization rods.
 

I have learned to not put too much effort into this bench alignment.
The real setting is with engine running and measuring vacuum levels.
 

I think this is 'good enough' for now. 
 

Idle adjustment which impacts butterfly opening. 
 

A different view of same setting. 
 

None of the 6 carbs I've worked on don't have a gap.
Not sure if I'm repeating an error or if production didn't match engineering design?
 

Here's a pic and instrtuctions from the FSM which show no gap.
The idea being the bracket absorbs the spring pressure, relieving stress on the syncronization rods.

That's the theory anyway.  
 
Last edit: 6 hours 58 minutes ago by dcarver220b.
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  • scotch
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Re: Carb Bench Alignment - does this look correct?

3 hours 56 minutes ago
#34883
In my opinion:
The sync adjusters are showing FAR too much thread.  This seems to be validated by the significant gap with the throttle-plates. With this much Gap it's likely to be a struggle to even get the engine to start and if/when it does you're going to have a HIGH rpm  "Run-away" !
Gap the throttle-plates to .006". I have a dedicated piece of brass shim-stock for this task which is 1/4" wide (maximum ! ).   
RE B12:  There is no gap because the instruction is to "Push the throttle grip completely closed. (the set-up with the 2 cable system) 
Re the fast idle screw/bracket.  In my opinion they folded it the wrong way !  Never-the-less - it's folded to provide more threads for the screw !
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !
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