Piston on carb getting stuck

[Datonedatsun]

Everytime I lift the piston on one carb it gets stuck about an inch up and the only way to get it to come back down is to pull the nozzle down an Inch down? Any ideas 

[siteunseen]

The dvd from ztherapy says loosen the screws on the dome and find where it raises and falls free then tighten the screws.

[240260280]

Try doing this without the needle in place and without the damper in place.

Here are some causes of piston binding when dropping.

1. buildup of carbon on dome-to-piston margin. The piston binds in the dome.

2. mechanical alignment of dome (as @siteunseen addressed). The piston binds in the dome.

3. nozzle holder misaligned and hole centre does not align with needle. The needle binds in the nozzle.

4. bent needle. The needle binds in the nozzle.

5. debris in damper tube or damaged damper piston. The small piston in the damper assembly jams in the piston's damper tube.

 

I am guessing #3 or #4 is your problem.

Edited September 14, 2019 by 240260280