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Discussion Starter #1
Hello everyone, I am having a problem when I attempt to adjust the velocity of my 98 custom. On a few of my markers, I will attempt to increase the velocity and will all but completely remove the velocity adjustment screw yet notice no difference on the chronograph. This has happened with multiple markers so I am curious if this is a common problem and hoping there is a simple solution to fix it. I'm using HPA to test them with and I have been firing multiple times while adjusting so I do not believe it is some random fluke. Any help is greatly appreciated. Thanks!
 

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me too ^^^ but just to make sure, the first thing I would do is take the adjustment screw completely out, I have seen it before where they put another set screw in front of the adjustment screw on 98s to act as a tourny lock, people go cranking away on the set screw thinking it is the adjustment screw and the marker will not shoot any faster or slower
 

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Discussion Starter #4
Pardon my ignorance but how does the spring going bad affect the velocity? Shouldn't I still be able to tighten the velocity screw and reduce power? I don't really understand the exact mechanics yet.
 

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That screw you turn limits the amount of air that flows through the valve. If you have the passage completely open and you still can't get enough velocity, it means that the hammer is not hitting the valve hard to keep it open long enough for the right amount of air to flow through.

The main spring is what pushes the hammer into the valve. If it has become weak or stretched out over time, it will not drive the hammer forward fast enough. You could try putting some shims in the back cap hole where the spring fits. It may improve your situation. I would just replace the main spring, though.
 

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Discussion Starter #6
That makes sense. Thanks, I guess I just need to order a bag of springs now.
 

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Discussion Starter #8
I'm having this problem with multiple markers. I was hoping it was just something simple I was doing wrong.
 

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Discussion Starter #12
One of them is floating around 150-180 and another one is around 215 and neither saw any effect from adjusting. I have a couple more that had the same problem but I'm not sure how fast they are shooting
 

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Discussion Starter #14
Took out six random markers and tested them. Each of them were consistently shooting around 240-250 and would not adjust any higher.
 

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what tank are you using? Im wondering if the output pressure on your HPA tank is something other than high pressure, if its putting out something like 500psi then that would easily explain why it is doing it on all the markers
 

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Discussion Starter #16
I was using a 3000 psi Ninja tank. How can I determine the output pressure?
 

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Is this for a fleet of rental markers? I imagine that you have the metal ninja tanks as well? they should all come out of the ninja "factory" set to high pressure output.

You can always check by downloading the manual. What you're looking for is the shim stack int he tank regulator. (NOT the spring stack. the shims are very thin pieces)
Ninja Standard and Ultralight HPA Tank Regulator Manual


I would open the markers and clean them, before I ordered new spring. At least try it on one or tow and see what happens. When you put them back together, put a few drops of paintball or air tool oil in the ASA before you screw the tank back on. I managed to save a handful of tippmans with stripped screws that I couldn't get open by doing this. It took some time, but after a while they will usually start working properly again.
 

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Discussion Starter #18
Yes, for rental markers. I can't imagine any of our tanks are set for low pressure but I'll have to investigate. I intend to have all of my markers cleaned very well. I started this thread before taking one apart and seeing how filthy it was. The sheer amount of gunk may be the problem.
 
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