[TR] '3a carb piston getting stuck....

[DAVE HOGYE]

The "ding" is most likely the cause.  There should be some scuffing on the inside where the ding is.  You can probably carefully sand it down.  The dome and pistons should be handled very carefully.  The slightest damage can cause problems.  I've tested dome and piston pairs for the same drop rate by covering the air passages and turning them upside down on the bench, to compare their fall.  

Dave H.

> On May 22, 2018 at 9:51 AM David Templeton <davidt at opentext.com> wrote:
> 
> 
>     Morning all
> 
>      
> 
>     Just finishing up the process of putting the refreshed carbs back on the ‘3a.  All is going ok, except, the rear most piston get stuck in the dome when pushed up.  It gets stuck as well when the dome is off the carb body so it is not the needle alignment.  That appears to be good.  It looks like the dome may have been dropped and now a small ding in the near top side that has reflected inside the dome and this is where the piston is getting stuck ( evidence of minor scratches ). 
> 
>      
> 
>     What can I do?   
> 
>      
> 
>     Thanks
> 
>     David
> 


 

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