I have a Tippmann 98 Custom ACT Platinum series. The velocity is stuck at 330 fps, and turning the velocity screw will not change the speed. The marker has been in it's case since the last time it was used at a tourney - 11 months ago. I use C02 as my gas source.
The only modification added to the marker is a Cyclone Feed system, which works fine.
I have stripped, cleaned and re-oiled the marker, and it functions fine, but the velocity problem remains.
Please see below page 8 for picture of what I am talking about. On page 8 in the middle left side is a picture of the internal vale parts. When you pull the valve out on the back side is a little o ring that can be taken out using an o ring pick. Make sure to watch the way the parts come out and look for any rust, also broken o rings if the valve is stuck open this will allow the maximum of air to pass. Most of time is this part that is messed up. You can by the valve in one unit this is the best option. But the first thing is to check the valve and all the parts. Lube it up and re install it. http://www.tippmann.com/pdfs/manuals/98Custom_Manual.pdf
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There is a velocity adjuster on the left side of the body, just below and to the right of the "N" in "TIPPMANN."
In order to adjust the velocity you need to be in a place where it is safe and legal to fire your marker (paintball field, with all bystanders protected by netting or paintball goggles.) You will need a chronograph and a 3/16-inch hex wrench.
The adjuster is a screw that blocks the gas flow from the valve to the bolt. If you screw it in (clockwise) it blocks more of the gas, so your velocity goes down. If you screw it out (anti-clockwise) it blocks less gas, so the velocity goes up.
Just take a shot over the chronograph to check your velocity, adjust and check again until you get it where you want it. Most paintball fields limit velocity to 285 feet per second. Never go above 300 feet per second, as velocities above that are unsafe (beyond paintball goggle ratings and can cause damage and infection on skin due to the heavy impact.)
It is important to test and adjust the velocity before each day of play, and even multiple times during the day as weather changes, because it is affected by temperature.
Accuracy is not adjustable with the screw on the side of the gun, that screw would be the velocity screw and should not be played with unless chronographing the gun to avoid setting it at unsafe velocities.
If you'd like better accuracy there are 2 upgrades you can make. #1 is higher grade paint. The more round and smooth the balls are, the more consistent and tighter the grouping will be. #2 is barrel. The closer the bore matches the paint, the more consistent and tighter the grouping will be also.
Buy a oil for a few dollars made specifically for paintball. Put a few drops in the ASA(where the tank screws in) screw the tank in and try to fire it about 10 times. If the gun still goes FA or sputters, I highly recommend having it serviced by a local pro shop or Tippmann.
The velocity adjustment is probably way too high.
This causes too much propellant to enter the firing chamber.
There should be an Allen screw on the side of the gun where
you can adjust the velocity. Try backing the screw out a turn and see what happens.
Here is your owners manual to help you. http://www.paintballadvisor.com/manuals/Tippmann%2098c%20manual.pdf
CO2 is very hard on O-rings so if you can use air you are better off.
I use an A-5, Autocockers, Smart Parts Ions and more.
This is caused when a gun needs cleaning and-or O-rings are worn.
Tear down the gun and clean the lube with the special paintball gun oils
and reassemble. See if it is better. CO2 is terrible for paintball guns.
Go with HPA (High Pressure Air, aka Nitrogen) and this will help.
I have the exact same gun. Looking at the gun, barrel facing left. You'll see the word Tippmann. Just below and slightly right of the end of that word you will see a allen head screw. Using and allen wrench turn that screw. If you wish to raise the velocity, tighten the screw. If you wish to slow the balls down, loosen the screw (bring it out, but not too far.) The faster the paint balls go though, they have a tendency to burst (but not usually) or the big thing with mine, is they get more back spin, and they travel UP, making them also go further. If they go to slow, they are pretty inaccurate. I find my optimum performance, when the allen screw is flush with the plastic on the outside of the weapon. Hope this helps! \\Seth\\
First you will need to know exactly the point where is liking from. I suggest you the powertube out and connected directly to the line so you can see what part is failing. After that there is no o-rings or anything involved so you would have to replace the part. It could be the line the powertube, or the valve. Here is a link to the manual in case you may not have it and a place where you can find parts for you 98 Custom.
No O-rings are used to change volocity on Tippmann Markers. The velocity screw is on the left side and is turned clockwise to decrease and CCW to increase velocity. Typically if you turn the screw in till it stops then turn it back 2 turns the gun will shoot about 280FPS.