Originally Posted by
papaone
Hello
I think the lower brackets of the YS carburetor body are fragile.
It happened to me to have cracked and therefore to have an air intake that prevents proper operation.
I don't know if this is
-to vibrations
-a bad flatness due to dilations
- tightening
How do you go about tightening the carburetor screws?
Claude

I think it is a fault in the casting. I know of a few people that have had the same thing happen. I've had 4 break. Always the right hand lower lug looking from the back.
I tighten the bolts evenly a little at a time, checking the barrel doesn't get tight after each nip.