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Old 10-04-2012, 02:13 PM   #8571 (permalink)
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I'd be very interested to hear from anyone who even went so far as to mill down the section a little bit, between the large piston face o-ring and the first of the smaller o-rings, maybe improve flow? But flow doesn't seem to be the problem. Rather, consistency...
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Old 10-05-2012, 12:39 PM   #8572 (permalink)
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So I bought mine in the first run of preorders, shot it three times, and then it wouldn't work anymore. After reading that everyone else was having issues, I put it aside and was waiting for things to get settled before even bothered trying to fix it. Rather than read 800 pages, would someone mind filling me in? What do I need to do to fix this thing?
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Old 10-05-2012, 03:09 PM   #8573 (permalink)
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check out the sticky page. we have added some fixes to help it run better. just browse over the last few pages.
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Old 10-05-2012, 03:11 PM   #8574 (permalink)
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Edit: yea, the last two posts in Metadyne Thumper Stuff will give you detailed info on the at home fixes so far, for the most part at least. below is like a quick guide covering those two posts, in terms of what is suggested that you try to get yours working

LOL smart man

A new hammer and main valve system have came out, but would require you to send you marker back to Metadyne, which, from what I hear, can take months if not years.

I suggest first you:
-Replace all o-rings (especially on main valve and reg piston) with high quality ones (there's a list somewhere, maybe in the other thread, of sizes)
-Fully lube marker, I suggest magnalube although others have had luck with vasoline, etc

Air up marker and see if it works. If it doesn't work for you, move on to following:

-Add inline reg with an reliable sub-300psi output (I use AKA regs, but Joedirt had success using a stock internally adjustable wgp reg, so it doesn't need to be anything fancy, as long as it can handle 200-300psi)
-Remove the middle o-ring on your reg piston to disable your thumper's internal reg (jd used his internal reg for fine tuning, with the inline reg to keep the input from going over 300psi, and you might also want to try this if you're uncomfy disabling your internal reg, although it might become necessary later)
-Setup bottomline so you can use CA and run that to your reg
-Make sure you reg never goes above 300psi! more likely you'll set it around 250-270psi to get the right fps, but just make sure it doesn't get past 300psi or you'll damage the actuating valve
-Make sure to check all o-rings are still good
-Lube everything up (with light lube, not too much)

Air it up and go from there.

If it's still not working, then I'd consider sending it back to metadyne. The inline reg and o-ring switch out solve problems with my original gen 2 thumper and my newer gen 1, which I bought not working for like 125

Last edited by toymachine; 10-05-2012 at 03:16 PM.
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Old 10-12-2012, 11:16 PM   #8575 (permalink)
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So after recieving my thumper back from metadyne a couple months ago(getting all the new parts....which took about 3 months) I finally found a day to play on this wed. Air'd her up took two shots off at a tree and she stopped working. Back in the bag she went, ran the rest of the day with just the tpx.

Pull the marker apart and find out the piston snapped where the front oring groove was cut in it... anyone else have this problem?


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Old 10-12-2012, 11:45 PM   #8576 (permalink)
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Yep , its a gen 3 piston..V4s are better and take up to 500 shots to break with out the mods listed ,
..Add inline reg with an reliable sub-300psi output (I use AKA regs, but Joedirt had success using a stock internally adjustable wgp reg, so it doesn't need to be anything fancy, as long as it can handle 200-300psi)
-Remove the middle o-ring on your reg piston to disable your thumper's internal reg (jd used his internal reg for fine tuning, with the inline reg to keep the input from going over 300psi, and you might also want to try this if you're uncomfy disabling your internal reg, although it might become necessary later)
-Setup bottomline so you can use CA and run that to your reg
-Make sure you reg never goes above 300psi! more likely you'll set it around 250-270psi to get the right fps, but just make sure it doesn't get past 300psi or you'll damage the actuating valve
-Make sure to check all o-rings are still good
-Lube everything up (with light lube, not too much)

Air it up and go from there.
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Last edited by Brewtt; 10-13-2012 at 03:18 PM.
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Old 10-13-2012, 02:40 AM   #8577 (permalink)
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Quote:
Originally Posted by woouulf View Post
Yep , its a gen 3 piston..V4s are better and take up to 500 shots to brake with out the mods listed ,
..Add inline reg with an reliable sub-300psi output (I use AKA regs, but Joedirt had success using a stock internally adjustable wgp reg, so it doesn't need to be anything fancy, as long as it can handle 200-300psi)
-Remove the middle o-ring on your reg piston to disable your thumper's internal reg (jd used his internal reg for fine tuning, with the inline reg to keep the input from going over 300psi, and you might also want to try this if you're uncomfy disabling your internal reg, although it might become necessary later)
-Setup bottomline so you can use CA and run that to your reg
-Make sure you reg never goes above 300psi! more likely you'll set it around 250-270psi to get the right fps, but just make sure it doesn't get past 300psi or you'll damage the actuating valve
-Make sure to check all o-rings are still good
-Lube everything up (with light lube, not too much)

Air it up and go from there.
I like what you say, but why couldn't you fix the typos!!!

Is the most current new main valve out (the one you have to send your marker main valve housing into metadyne to get it installed that we've been told is the ultimate fix) the gen 4, or is the gen 4 the last of those you didn't need to mod the body to install? Thanks woouulf!

Last edited by toymachine; 10-13-2012 at 06:18 PM.
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Old 10-13-2012, 08:51 AM   #8578 (permalink)
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Sorry, but I haven't been really keeping up with this thread as I should be.
Not having the marker in my possession sought of detracts my attention from it a bit. Though I do check on occasion.
Enough to notice that there are some of you here that have achieved some considerable strides at getting the Thumper to where it should have been before its release.
Thank guys.
Now... A bit more about this Gen. lV piston please? These are actually available?
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Old 10-13-2012, 10:08 AM   #8579 (permalink)
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no real word yet on availability. they are suppose to be a harder aluminum and with a larger shaft, which requires your internal body housing to be drilled out some. of course we all know the drama of sending in a marker to the black hole that is metadyne.
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Old 10-13-2012, 06:15 PM   #8580 (permalink)
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So I'm assuming the new pistons will be 7071, as they're supposed to be "stronger" aluminum... Still wish they're do a ss or ti run, although I understand them being a bitch to machine. Then again, they probably could do away with the whole issue if they'd just figure out how to get the internal reg working reliably (I.E. put a pressure relief valve on the thing to vent air when the valve over pressurized the main piston/valve!!!! such an easy fix!!!)

ARG

I'm also excited to see some more info and pics on the "break proof" newest of the pistons. Understandably, given they've worked so well with inline regs, I'm not ready to send my thumpers into metadyne for the upgrade unless I lived within walking distance...

Regarding fixing the internal reg, I actually don't think it would require much work - a pressure relief valve might not even be necessary! Make the reg piston/valve out of whatever Al they have been, but polish it and get it anodized (the inside of its housing is already ano'd but it should also be polished) and then polish again!

Anodizing and polishing would allow the reg valve to move much more freely and have tighter more reliable tolerance/seals. The key to the regs design seems to be exactly that, needing to be able to hold very tight tolerances on the seals for it to be reliably accurate (see earlier page for diagram of how the reg works).

I mean, would anyone ever use a bolt that wasn't polished or ano'd in your ion/matrix/geo/droid/etc. etc.?! Hell ****ing no!

Last edited by toymachine; 10-13-2012 at 06:29 PM.
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