- For folks with cyclone feed systems: this will cover most of what you will need to do, you just have an extra fitting and hose to hook up for the cyclone.
- Also, if you're not familiar with your guns internals, don't install this yourself. Please take your 98 to your shop/field and have them install it for you.
- I am in no way responsible for you screwing up your 98C if you fail at this.
-Allen wrenches: 5/32", 1/8"
-reamer or file
-Response Trigger kit
~60 minutes of free time
Step 1: Remove the 5 receiver screws holding your gun together and disassemble your gun.
Step 2: Remove the power tube assembly from the right receiver.
Step 3: Take the velocity screw out of the power tube/valve assembly and place it in a safe spot.
Step 4: This is the hardest part, getting the valve assembly out of the power tube. The method I used is risky, because you can damage the valve's threads, so take it nice and easy. *If anyone has a better way of removing the valve assembly I will gladly add it to this.* Take the short end of an Allen wrench and stick it in the large, bottom hole of the valve assembly, pushing it toward the back of the power tube. When you get it far enough along, you can push the front end of the v.a. down with a wrench or screwdriver, see pic.
Step 5: Grab your new
power tube, align the valve assembly so that the holes on both the power tube and valve assembly will match up. make sure you are putting the v.a. in the correct direction: valve pin towards the back of the power tube. Push the v.a. into the power tube until all of the screw/hose fittings match up. If you need to rotate the valve assembly, use the same method we did for removing it: stick an Allen wrench in a hole and gently move the valve assembly until everything is lined up, see pic. Go ahead and put your velocity screw back in the valve assembly at this time.
Step 6: Punching the hole in your right receiver. If you don't have access to a punch, use a drill with a 3/16" bit. I don't have a before/after shot since this was done at work, but its an easy process. Place your punch in the center of the knock-out disc (highlighted in the pic) and... knock it out.
Step 7: Test-fit the piston assembly in your grip and see if the hose fitting fits through the new hole. If it doesn't fit, file or ream the hole out until the hose fitting sits in there nice and snug. I chose to ream this hole a bit for a proper fit and nice clean look.
Step 8: Reassemble your gun, making sure to swap in the new sear spring and piston assembly. This new spring is pretty heavy duty, which means pain in the arse to get on the sear and pin, oh well. When you've made sure that the new sear spring is installed properly, completely assemble your gun, screwing in the 5 receiver screws.
Step 9: Take the air hose and screw in the silver 90º fitting to the piston's hose fitting. Use pliers and tighten the hex nut on the 90º fitting, don't try to tighten it down with the adjustment screw. Important: Do not over-tighten the fitting! Tighten enough so the fittings are snug and won't move during play.
Step 10: Use a flathead screwdriver to screw the black fitting into the power tube, again make sure not to over-tighten the screw.
Step 11: Gas up your gun and adjust the response trigger's speed to your liking by tightening (slower speed) or loosening (faster shooting) the adjustment screw on the silver fitting.
There you have it! Critiques welcomed.