JSAR Rator issues any help would be great.

[chwillbill68]

Hello Guys.   My Raptor leaks all of its air out.  When I got it I shot about 4 mags no problem.  Next time I go to shoot on the second mag it starts leaking.  It leaked all the air from the tank.  Travis gave me a trick to fill it fast and dry fire it with reg maxed out to blow anything in it out.  I did this and after about the 5 dry fire it stopped leaking.  I refilled to 3k psi and let it sit to see if it leaked.  It did not.  So today I started shooting and on the second mag it started leaking again.  I removed the mag and dry fired several times no luck.  Turned the reg way up and did it again. no luck.

  So I tore it apart like the video Travis posted for us.  I did not really see anything jump out as wrong that would cause this issue.  I did find on the ninja reg that one of the set screws was not there.  Not sure if that is due to it not having room under the mag holder/lower rail or not.

   I also have a plastic ring that came out from inside the valve.  I did not see that in Travis video.   

[oldpro]

 Burnish the valve and put it all back together. Contact JSAR about missing grub screw. Why not send it in under warranty they will get it back to you quickly im sure.

[chwillbill68]

The pic's above show the missing set screw on the ninja reg. there is one on each side, I took a pic of both.  The other is of the inside of the valve.  There is an oring in there that is hard to see.  But that black spacer on the valve rod must rest on the oring and the brass part.  Wondering if something is going wrong at the oring and spacer that is causing all my air to leak out.

[Motorhead]

Under that seat ring there should be an o-ring.
make sure every things clean, Lube the o-ring, and replace the seat and poppet stem.  Install the thimble and circlip.

Now with a electric drill attach it to the protruding stem and with a fair amount of pulling pressure spin the stem both directions a couple times.
Assemble just the lower tube and check it. repeat if it does not seal.

[chwillbill68]

Burnish the valve and put it all back together. Contact JSAR about missing grub screw. Why not send it in under warranty they will get it back to you quickly im sure.

I called and left message and emailed. But didn't get a response yet. So like you said in the video this gun is easy to work on and I want to shoot it.  I figured it would be an easy fix. But don't really see anything wrong.

What do you mean by burnish the valve (the brass area that goes against the plastic ring)?  Everything on the valve is super smooth.  I don't feel any thing that would cause issue.

[chwillbill68]

Under that seat ring there should be an o-ring.
make sure every things clean, Lube the o-ring, and replace the seat and poppet stem.  Install the thimble and circlip.

Now with a electric drill attach it to the protruding stem and with a fair amount of pulling pressure spin the stem both directions a couple times.
Assemble just the lower tube and check it. repeat if it does not seal.

Thanks You.  I will try that!

[oldpro]

Burnish the valve and put it all back together. Contact JSAR about missing grub screw. Why not send it in under warranty they will get it back to you quickly im sure.

I called and left message and emailed. But didn't get a response yet. So like you said in the video this gun is easy to work on and I want to shoot it.  I figured it would be an easy fix. But don't really see anything wrong.

What do you mean by burnish the valve (the brass area that goes against the plastic ring)?  Everything on the valve is super smooth.  I don't feel any thing that would cause issue.

Not surprised withe the COVID stuff having most companies closed.

[nervoustrigger]

Any time I’m lapping a poppet to a valve seat, I like to first mark both contact surfaces with a Sharpie (magic marker).  When the spinning action removes the marker completely from both surfaces, you know they are capable of sealing.  Unless the leak is very, very slight, I suggest using a light abrasive…something like a metal polishing paste.  Nothing as coarse as valve grinding compound unless there’s a defect so large you can see it with the naked eye.  I try to avoid generating so much heat that the plastic begins to melt, although if it’s a material like Delrin, that’s probably okay and expedient.  I just prefer to avoid it based on some cursory knowledge that melting thermoplastics causes the polymer chains to shorten and makes the material less durable.

[Motorhead]

Any time I’m lapping a poppet to a valve seat, I like to first mark both contact surfaces with a Sharpie (magic marker).  When the spinning action removes the marker completely from both surfaces, you know they are capable of sealing.  Unless the leak is very, very slight, I suggest using a light abrasive…something like a metal polishing paste.  Nothing as coarse as valve grinding compound unless there’s a defect so large you can see it with the naked eye.  I try to avoid generating so much heat that the plastic begins to melt, although if it’s a material like Delrin, that’s probably okay and expedient.  I just prefer to avoid it based on some cursory knowledge that melting thermoplastics causes the polymer chains to shorten and makes the material less durable.

NO ABRASIVES !!!
Seat is soft ACETAL and poppet Brass ... BOTH will embed the abrasive, DON'T do that !

Sorry jason ...   

[nervoustrigger]

Ah, good to know.  I definitely don’t mind being corrected!  The idea here is for everyone to learn.

[oldpro]

Ah, good to know.  I definitely don’t mind being corrected!  The idea here is for everyone to learn.

So true! I learn something new every day.

[chwillbill68]

I did what Scott said twice with no luck yet.  I will keep trying and see if I can get it to seal.

[Motorhead]

I did what Scott said twice with no luck yet.  I will keep trying and see if I can get it to seal.

That is the in shop technique ... Hopefully someone at JSAR will extend a helping hand

[oldpro]

I did what Scott said twice with no luck yet.  I will keep trying and see if I can get it to seal.

Is it a very slow leak? Take some fine grit sandpaper and lay it on a piece of glass and sand both sides of the seat disc till its got a smooth new surface and give that a go.

[PoolDoc]

Maybe a little late but did you verify its the valve leaking? Balloon over barrel?
I have had mine apart and its super easy to work on to me. I had a leak between the O ring on the valve and tube that would empty the gun after a period of time. If you think its the valve to seat leaking burnishing as recommended above should work. I would inspect everything under a magnifying glass if you have one.

[Ac8528]

Burnish the valve and put it all back together. Contact JSAR about missing grub screw. Why not send it in under warranty they will get it back to you quickly im sure.

Wait I  am confused. I thought oldpro owned jsar?

[oldpro]

Burnish the valve and put it all back together. Contact JSAR about missing grub screw. Why not send it in under warranty they will get it back to you quickly im sure.

Wait I  am confused. I thought oldpro owned jsar?

Negative Sir. Jacob ensign ownes JSAR and always has.

[Ac8528]

My mistake. I always see you on Instagram and youtube videos. You always speak about JSAR so passionately I assumed you were the owner. That's what I get for assuming.

[oldpro]

My mistake. I always see you on Instagram and youtube videos. You always speak about JSAR so passionately I assumed you were the owner. That's what I get for assuming.

Common mistake. I did design a lot of it though so I do get a little excited about it.

[KnifeMaker]

Mine did the same today. I will take her apart after a little snooze. Old age ya know. LOL


 From what yo describe, I figured it was the valve poppet to seat area rather than the reg.hat they suggested works well.


I'm a little hard on mine. I put well over 500 31gr. slugs down range with it today. Man, I'm getting LOW on lead!
 Knife