Fixed the FPS, but am now having feeding issues.

[incrediboy729]

Hello.
I don't know if any of you remember the problems i've been having upgrading my CA m4, but i finally more or less fixed the air seal problem. i'm now getting 483fps from my m140 spring. However, after i installed the air nozzle (or somewhere around that time) i am having feeding issues. Double feed, no feed, just being very strange. My parts of concern are
Prometheus POM NEO piston head
ARES cylinder head
Guarder Cylinder head
Systema Hop up bucking
and a CA tightbore.
I have also performed the tapplet plate mod for a better airseal.
What do you think is causing my problems?
Thank you for your time.
-Brett

[chaosnemesis]

First thing that comes to mind is it's your tappet plate. Either the arm that contacts the sector gear or the sector gear itself is worn. Also did you install a sector clip/delayer?

http://shop.ehobbyasia.com/king-arms...ctor-clip.html

[incrediboy729]

Originally Posted by chaosnemesis

First thing that comes to mind is it's your tappet plate. Either the arm that contacts the sector gear or the sector gear itself is worn. Also did you install a sector clip/delayer?

http://shop.ehobbyasia.com/king-arms...ctor-clip.html

I'll take a look at my tapplet plate. Although i'm pretty sure it is fine. And the mod shouldn't have anything to do with this, should it? i mean, all it does it make the nozzle go farther forward, it shouldn't affect the feeding, right?
The last (or first, i can't remember) tooth of my sector gear has some wear, but nothing that should cause this kind of problem.
Sector clip? I thought that was only for high speed applications? I'm running an m140 on double torque helicals, i'm only getting like 13ish rps.

Thanks so much for the assistance so far.
-Brett

[chaosnemesis]

Your mod may have the nozzle just forward enough to prevent the bb from loading. The sector clip ensures that the tappet is held back or "delayed" far/long enough to allow the bb to enter the chamber. It's not only for high speed setups. In fact, you should have one in every setup.

The last tooth of the sector would only affect the piston and not the feed problem.

All that is pulling the tappet plate back is a small arm about 1/16th of an inch. This can wear down the "fin" of the tappet preventing the nozzle from pulling back as far as it should. The wear can be very subtle so you may not necessarily see it.

[incrediboy729]

Originally Posted by chaosnemesis

Your mod may have the nozzle just forward enough to prevent the bb from loading. The sector clip ensures that the tappet is held back or "delayed" far/long enough to allow the bb to enter the chamber. It's not only for high speed setups. In fact, you should have one in every setup.

The last tooth of the sector would only affect the piston and not the feed problem.

All that is pulling the tappet plate back is a small arm about 1/16th of an inch. This can wear down the "fin" of the tappet preventing the nozzle from pulling back as far as it should. The wear can be very subtle so you may not necessarily see it.

What do you mean too far forward to prevent the bb from loading? The tappet plate mod only affects the movement of the nozzle going forward, but it still goes all the way back. i can see the nozzle maybe pushing the bb too far into the chamber, but why would it affect the feeding? I'm not trying to argue your point, you very well could be correct, i'm just trying to understand it all

Hmm. I'll open it up again and take a look, and maybe replace it.

I'm on a very tight budget at the moment, and i can only afford to replace one part at a time. Would you say to try the sector clip or the tappet plate first? Maybe i'll google image some tappet plates and see if mine is worn, being i can't remember what it looked like a year ago haha.
Thank you for your help.

[chaosnemesis]

From what i understand of the mod, (assuming it's the same one) the backside of the nozzle portion of the tappet is sanded down a bit positioning the nozzle slightly forward on the tappet plate. So when the nozzle moves forward it travels furthur into the bucking portion of the chamber getting a slightly better seal. However, without modifying the "fin" portion of the tappet, the nozzle stays slightly forward even though the tappet gets pulled back.

Let me put it this way.

Pre-mod: The leading edge of the "fin", that contacts the sector arm, and the tip of the nozzle is "x" distance. The sector spins and pushes the tappet back "y" distance clearing the feed portion of the hop chamber exactly. BB loads in, tappet gets released nozzle goes forward chambering the bb.

Post-mod: tappet is sanded (we'll say .2mm). So now the nozzle sits slightly forward and the distance from fin to tip is x + .2mm. Now when the sector contacts the "fin" and moves the tappet back the same y distance but the nozzle sits .2mm forward. That's .2mm into the feed path blocking the bbs from loading.

The sector clip basically enlarges that tiny little sector arm pulling the tappet back and as long as possible. You can also use a tiny bushing and fix it to the arm.

http://www.rsov.com/index.php?target...roduct_id=1478

[incrediboy729]

thank you for the explanation. but it seems that the parts might have just needed breaking in, as it doesn't do it anymore. sorry to bug you on a seemingly now pointless question.
but thank you very much for the help!

[chaosnemesis]

hey man that's what this forum is for right??? As long as you get to shoot something in the end :P