carb piston "apertures"

Roger, can you please clarify what you are referring to? "just press fitted it back down in place" As far as we can tell/see the piston/slide on the right is not the same as the piston slide on the left. If you come across this in the field, it must be replaced with the proper piston slide. We measured from the edge of the piston to the curved side and it should be no thicker than 0.230" 

It is assumed the one piston slide is from a different BING carburetor.  

OK, I filled out a CSIR as requested.  Not sure what happens next.  I'm guessing the simplest thing is to order up a new $200 piston...

And here I was thinking this carb inspection and reinstall would take me a weekend at most...

John, hey, they always say only to work on one carb at a time!   That sure would be something if Bing were mixing up aircraft and motorcyle carb parts! ?

Rotax-Owner wrote:

Roger, can you please clarify what you are referring to? "just press fitted it back down in place" As far as we can tell/see the piston/slide on the right is not the same as the piston slide on the left. If you come across this in the field, it must be replaced with the proper piston slide. We measured from the edge of the piston to the curved side and it should be no thicker than 0.230" 

It is assumed the one piston slide is from a different BING carburetor.  

The center can move under the right circumstances. What that is in a normal operation I don't know and did someone do something to it before I saw it, I don't know. I do know it can be pressed back in place with a little precision. . I've seen it 3 times over 20 years.

Roger previously said "They should both be down flush with the piston base where it curves" which had puzzled me.  I see now he was talking about the center base that holds the needle. 

But it's not a question of where that needle base is – the bottom of the piston itself is actually shaped differently.  This is perhaps not obvious at first glance, even when the two are side by side.  The piston on the right has a much shallower concave portion.

Tyler Hathaway wrote:

Roger previously said "They should both be down flush with the piston base where it curves" which had puzzled me.  I see now he was talking about the center base that holds the needle. 

But it's not a question of where that needle base is – the bottom of the piston itself is actually shaped differently.  This is perhaps not obvious at first glance, even when the two are side by side.  The piston on the right has a much shallower concave portion.

I messed up.

Son of a gun. I missed that. I got so focused on the center when the picture popped up I overlooked that. I never thought someone would put a different piston in a carb. I was thinking original piston.

Thanks for pointing that out.

I have though seen the centers move on normal original pistons (slides).

I agree he needs a new piston (slide).