Upgrades and Customizing - custom 98 pump

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custom 98 pump

Printed From: Tippmann Paintball
Category: Paintball Equipment
Forum Name: Upgrades and Customizing
Forum Description: Trick it out!
URL: http://www.tippmannsports.com/forum/wwf77a/forum_posts.asp?TID=172369
Printed Date: 11 March 2026 at 6:52am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: custom 98 pump

Posted By: DennyBoy
Subject: custom 98 pump
Date Posted: 27 December 2007 at 3:27pm

im trying to make a pump outa a 98 custom thats all stock. what im trying to do is make it so there is no blow back. how would i do that?

any ideas are helpfull. links are cool also.

Replies:

Posted By: RoboCop
Date Posted: 27 December 2007 at 3:49pm

Try searching. People have done it before and they also sell kits.

Posted By: TinMan
Date Posted: 27 December 2007 at 8:00pm

Disassemble your valve.

Use a #10 32 tap and tap the blowback hole just enough to show threads.

Screw a standard cyclone banjo fitting screw into the blowback hole.
It should get tight enough to break off before you see it on the other side.

Grind it off flush, drill it .004 larger than your valve stem.

Grind the small bump off your valve stem.

Reassemble

I do this for my Ebolted 98's and X7's and there's not enough blowback to feel.
Without a regulator your FPS will jump up quite a lot.