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Base gun is a KWA TK.45C SE I bought on release. Converted to a DSG in November of 2019 with these parts:
Siegetek 14:1 9-tooth dsg set
ASG 22TPA motor (moved to 28TPA in June of 2020)
SHS 14.5T lightened piston (with extra teeth removed)
Lonex POM piston head (w/o bearings)
- Important note: On first assembly, I used a 3mm flat washer for AOE correct. I replaced the piston & piston head in I think April last year with the same washer.
Lonex cylinder & cylinder head
SHS 21.4mm nozzle
KWA RM4 tappet (This is used instead of the stock one so I can use aftermarket nozzles. Along with a brass spring spacer to return the tappet faster.)
Gate Titan Expert (Came with the gun)
Guarder SP160 spring (Also have a SP150 and SP170)
Maple Leaf 70 degree macaron (Now an 80 degree)
Prommy 208mm barrel
Stock propriety hopup chamber.
When first assembled, it worked pretty well. Was getting 390 +/- 2 fps on 0.20g. 40~ rps on an 11.1v, no feeding issues. Worked surprisingly well for my first DSG. Kept it clean and maintained. Replaced the piston, piston head, cylinder, and cylinder head (was only in stock as a complete kit) in April last year as some of the piston rack came off and scratched the cylinder walls. Worked fine after those were replaced.
About a month ago during a game, it started feeding inconsistently. Figured it was the tappet plate as it had about 50k rounds on it by now. Disassembled it and I was correct, ordered a couple new ones. I also noticed that when I last replaced the piston head, I didn't tighten the screw enough and it had shifted on the piston. Since it was red loctited on, I just ordered a replacement and drilled the center off the old one. I also decided to order a 70D polyurethane airpad and use that instead of the flat washer to correct AOE. It all arrived and put it in.
Now the problems: fps had dropped to about 315 on 0.25g and was very inconsistent at about +/- 12 fps deviations. I noticed I can push the hopup against the gearbox and it pushes the nozzle back slightly instead of going farther into the bucking so I replaced the tappet spring. (Still have this issues, not sure if it was there from the very beginning.) I then decided to take a high speed video of the gearbox firing and see if the nozzle was being pushed all the way forward or fast enough. When viewing the video, it looks like the nozzle is coming back too early and air is still being pushed out.
Video:
https://photos.app.goo.gl/cJy3aGVhFvpdA7AL7
Full Auto video:
https://photos.app.goo.gl/iicG79nhDSccqNse7
So I then trimmed the start of the tappet (to the point that it was more than the broken one. Though it still feeds.) to try and delay the sector from pre-engaging it. Even tried setting the AB higher on the Titan to 80%. I maybe gained 10 fps but it was still very inconsistent. I then googled some and ended up getting rid of the airpad to see if thats the issue. This brought me back up to about 330 fps on 0.25g but, still inconsistent. Then I found an airleak with my bucking to barrel so I tefloned it and that brought it up to 360 fps on 0.25g. And yep, inconsistent still. I then threw in a SP170 I had tried before and it went up to about 380 fps on 0.28g (What I normally use.)
I was tempted to leave it there but decided against it. I was readjusting my hopup for the new spring and figured out it would settle at around 375 after one mag but drop to 360-355 after 3-4 of semi spamming.
I found a way to remove the mag well and put in a different pin to hold the upper to the lower and tried the paper test on the hopup. Blew it away every time. So I figured I had finally found the issue after about 5 days. I threw in a MAXX adjustable nozzle and it would still blow it out no matter what I set it to.
At this point I'm pretty certain its still tappet pre-engagement but no Idea how to fix it. I've googled about everything possible at this point so here I am. Any advice or ideas are appreciated. Sorry for the long post but I felt I had to explain my whole process.
Siegetek 14:1 9-tooth dsg set
ASG 22TPA motor (moved to 28TPA in June of 2020)
SHS 14.5T lightened piston (with extra teeth removed)
Lonex POM piston head (w/o bearings)
- Important note: On first assembly, I used a 3mm flat washer for AOE correct. I replaced the piston & piston head in I think April last year with the same washer.
Lonex cylinder & cylinder head
SHS 21.4mm nozzle
KWA RM4 tappet (This is used instead of the stock one so I can use aftermarket nozzles. Along with a brass spring spacer to return the tappet faster.)
Gate Titan Expert (Came with the gun)
Guarder SP160 spring (Also have a SP150 and SP170)
Maple Leaf 70 degree macaron (Now an 80 degree)
Prommy 208mm barrel
Stock propriety hopup chamber.
When first assembled, it worked pretty well. Was getting 390 +/- 2 fps on 0.20g. 40~ rps on an 11.1v, no feeding issues. Worked surprisingly well for my first DSG. Kept it clean and maintained. Replaced the piston, piston head, cylinder, and cylinder head (was only in stock as a complete kit) in April last year as some of the piston rack came off and scratched the cylinder walls. Worked fine after those were replaced.
About a month ago during a game, it started feeding inconsistently. Figured it was the tappet plate as it had about 50k rounds on it by now. Disassembled it and I was correct, ordered a couple new ones. I also noticed that when I last replaced the piston head, I didn't tighten the screw enough and it had shifted on the piston. Since it was red loctited on, I just ordered a replacement and drilled the center off the old one. I also decided to order a 70D polyurethane airpad and use that instead of the flat washer to correct AOE. It all arrived and put it in.
Now the problems: fps had dropped to about 315 on 0.25g and was very inconsistent at about +/- 12 fps deviations. I noticed I can push the hopup against the gearbox and it pushes the nozzle back slightly instead of going farther into the bucking so I replaced the tappet spring. (Still have this issues, not sure if it was there from the very beginning.) I then decided to take a high speed video of the gearbox firing and see if the nozzle was being pushed all the way forward or fast enough. When viewing the video, it looks like the nozzle is coming back too early and air is still being pushed out.
Video:
https://photos.app.goo.gl/cJy3aGVhFvpdA7AL7
Full Auto video:
https://photos.app.goo.gl/iicG79nhDSccqNse7
So I then trimmed the start of the tappet (to the point that it was more than the broken one. Though it still feeds.) to try and delay the sector from pre-engaging it. Even tried setting the AB higher on the Titan to 80%. I maybe gained 10 fps but it was still very inconsistent. I then googled some and ended up getting rid of the airpad to see if thats the issue. This brought me back up to about 330 fps on 0.25g but, still inconsistent. Then I found an airleak with my bucking to barrel so I tefloned it and that brought it up to 360 fps on 0.25g. And yep, inconsistent still. I then threw in a SP170 I had tried before and it went up to about 380 fps on 0.28g (What I normally use.)
I was tempted to leave it there but decided against it. I was readjusting my hopup for the new spring and figured out it would settle at around 375 after one mag but drop to 360-355 after 3-4 of semi spamming.
I found a way to remove the mag well and put in a different pin to hold the upper to the lower and tried the paper test on the hopup. Blew it away every time. So I figured I had finally found the issue after about 5 days. I threw in a MAXX adjustable nozzle and it would still blow it out no matter what I set it to.
At this point I'm pretty certain its still tappet pre-engagement but no Idea how to fix it. I've googled about everything possible at this point so here I am. Any advice or ideas are appreciated. Sorry for the long post but I felt I had to explain my whole process.
