[mr. potatohead]

And the new spring is lancer tactical

This may be your problem, just saying. Try a reliable spring such as a guarder, prometheus, modify, ASG ultimate, or lonex. Stay away from SHS, matrix, EVIKE, and LT...

 

[mr. potatohead]

It may be that LT's quality control just isn't that good with their springs, leading to a possibly mislabeled unit? I don't like telling people to just plunk down more money for another part, but in your case it might be beneficial getting a reputable spring brand.

 

[mr. potatohead]

Whoops I forgot you're already planning on swapping your gearset. By all means dig in your gearbox then, problem could be anything. But I would still recommend purchasing a good spring later on down the road; for now, if it ain't broke, don't fix it.

 

[mr. potatohead]

As a general rule bushings are more reliable, but bearings should be fine for your purposes.

 

[mr. potatohead]

AOE will increase the longevity and efficiency of your build at minimal cost and time. All it usually takes is a rubber washer. Try looking at the pinned AOE thread...

 

[mr. potatohead]

Or you can get a 14 tooth piston...but that's more money...

 

[mr. potatohead]

Pretty much the same thing

 

[mr. potatohead]

Ah yes that cylinder head has seen better days. A tip to check for cylinder air seal when you install a new one: hold the cylinder with the cylinder head installed and the piston assembly inside. Put your finger over the cylinder head to create a seal and try to push the piston forward. It should be extremely difficult if not "impossible" to push the piston. If you feel a leak, the cylinder head is not sealed well with the cylinder or (more likely) your piston head O-ring is bad. You can try taking the O-ring out and giving the it a stretch or two.

 

[mr. potatohead]

What about your tappet plate are you concerned about? Return time too late? If you're afraid your tappet's late you can cut a coil or two off the tappet spring and then rebend it which will increase return speed.