I had enough

[stoffa15]

I posted a thread a week ago about me not being able to get my minimag to shoot over 168fps... This is horrible, I always used tippmanns before and decided to run diffrent from the pack. So i bought a used mag on ebay.It is a 68 classic with a minimag valve in it..


I brought the marker with me to my local field to see if it lived up to all the hype.When I tried to chrono it wouldn't go over 168fps. So I took the marker apart and checked if there was anything i could tell was wrong with it. Now mind you I don't know a lot about the mags, just from what I have watch on youtube of the tech tips from Tom Kaye.

So Turned the adjuster all the way to the right until it started venting air out of the screw then backed it up and chroned. No change ... I have no clue what to do with this and nobody at my proshop seams to know anything about mags cause there like 17 years old so I'm stuck now...

I started a new thread to buy a diffrent valve cause I don't know what else to do please some body help me.
I"m using a HPA at 4500psi and yes its full... IDK what else to do

[Spencer]

Im new to mags, but was the tank high pressure or low pressure..

[stoffa15]

Im new to mags, but was the tank high pressure or low pressure..

High pressure dude

[longi]

Relpace all the o rings, not forgetting the one on the brass insert in the back of the reg, as this is the one that controls yelocity consistancy. Just hook it out with a small screwdriver. There's very little to go wrong with a Mag as there's not too many parts to the valve. Also give the valve a good clean. 168 fps is very low. Have you also tried a different tank?

[AO Moderation Team]

So i bought a used mag on ebay.

Did you clean the reg piston????

Unscrew the velocity adjuster all the way out and remove spring pack and piston. Pay attention how you remove and reassemble it the same way. Clean everything and reassemble. Use some light grease on the pack.

see this link for view.......http://www.airgundesignsusa.com/down...plodedview.pdf

[Smokee_2_7]

Is the regulator leaking out the back regardless of how far you turn it in? Or does it only begin leaking after you've cranked the adjuster down a good bit? You may want to replace your reg seat, although that may not be the problem since your velocity a so low.

Just right off the top of my head, I would think about the lvl 10 bolt spring versus regulator piston.

Do you have a lvl 10 bolt in this minimag? What color bolt spring are you using?

Ventng out the back is due to the safety bleed off built into the regulator piston. Its designed to keep the gun from shooting at an unsafe velocity. If for some reason the regulator piston is venting to soon, it may need to be replaced. This problem was/ is most common with older valves that were upgraded to level 10 bolts. The lvl 10 will require a higher reg pressure to function properly with the longer springs.

One last thought to check: when your marker is gassed up, can you see a small space between the tip of the triger rod and the back of your trigger? If the rod is too long, I guess it MIGHT prevent the on/off from opening fully, possibly resulting in low velocity. Most likely it would result it the gun not firing consistently. Still, its worth checking.

Let me know about what kind of bolt youre using!


Hope this helps,

Carl

[JRingold]

I would guess you need a new Regulator Piston Assembly, $18.

http://store.airgundesignsusa.com/index.cfm?fuseaction=catalog.prodInfo&productID=30&categoryID=18

[Tao]

Probably need to take the valve apart and clean it. Here are the you-tube for the automag tech videos. These videos give you a step by step instruction on how to take things apart, diagnose problems and maintain your gun.

http://www.youtube.com/watch?v=vehPc7vuK20

(it is in 9 parts)

[Spider-TW]

I have no clue what to do with this and nobody at my proshop seams to know anything about mags cause there like 17 years old so I'm stuck now... :

Because mags have been around so long, when you buy a used one, you have no idea what has been done to it (or not) in its life time.

The first thing we look at in an old mag is the oring condition. The rebuild kit ~$20 has all of them. However, I would clean it up first, particularly like the mod says. The reg piston oring is hard working and exposed to everything inside and outside the marker. 'Clean everything' means clean the walls inside of the reg where the piston oring runs also.

No leaks?

Do you have the round, stainless on/off valve?

Pics will help.

[trevorjk]

you need a new regulator piston assembly. they come factory sealed and as soon as they are taken apart they always leak. get a new one from any AGD Vendor or AGD (like $20 or so)

just drop the new one in, and your good to go. i personally just had to do this my self on my classic mag.

[stoffa15]

the valve

I haven't tried a diffrent tank yet onthe mag, The bolt i have is a lvl 7, the spring is aluminum in color and passes the bolt by about a quarter of a inch..

I haven't tried taking the regulator apart yet, I'll do so when I get home from my game later tonight.. and try to change all the orings, and lube it well


where should I apply grease though????

[michbich]

On the reg piston. Make sure you have a non-petroleum grease to prevent from eating the orings.

[trevorjk]

• take the velocity adjuster all the way out.

• pull spring pack out of velocity adjuster. take note on how the spring pack comes out of the velocity adjuster (should only be one way it goes in)

to grease the spring pack, just wipe it off the best you can, and apply a lithium grease to the spring pack. dow will work fine. although a lifetime supply of lithium greese is like $10 at a hardware store

• then you should see a hex head nut. take an allen wrench and slide that peice out.

the piece you just took out with the allen wrench is the regulator piston. look it over. does it look as if some one took it apart? tool marks for clamping down on it? allen screw loose? if so, this must be replaced. as stated above its only $20 and it will fix your problems.

• then put it back together the way you took it apart. and your reg is fixed. but like i said im 99% positive you need a new regulator piston

[Spider-TW]

the piece you just took out with the allen wrench is the regulator piston. look it over. does it look as if some one took it apart? tool marks for clamping down on it? allen screw loose? if so, this must be replaced.

But don't loosen or take the allen screw out of the piston. That part of the piston is not a maintenance item. That's why the whole piston gets replaced if it fails.

Can you say about how many threads on your velocity adjuster are showing when it starts to vent? I'll have to check mine, but I think it operates with around 4 to 5 threads showing.

A weak relief in the reg piston does make sense.

[PhoenixWolf]

Yeah, that's your powertube piston. You may need to replace it with a new one. First, grab an Automag Parts kit and refurbish your valve. That may well fix it by itself. If that doesn't fix it, order a new powertube piston and replace it.