Possible Reasons for Slow Firing TM M4A1?

Wilson · March 8th, 2008, 06:17

I just recently picked up a bunch of TM M4A1's and one of them seems to be firing slower than the rest. On an 8.4v 1400mAh battery (I used the same one on all of them to compare), this stock M4 cycles at about half the speed of the others.

What are the possible causes of this? I was told that it wouldn't be the motor, because those are usually either working or burnt out entirely. Sticky piston? Any assistance in this matter would be greatly appreciated.

Omi-san · March 8th, 2008, 11:19

I'd say tight shimming is the # 1 suspect.

Number 2 would be too much electrical resistance.

Cpl T. Syndrome · March 8th, 2008, 11:19

Could be anything from mechanical to electrical.pretty much have to take the thing apart and have a look..pm commin

ILLusion · March 8th, 2008, 15:43

If it's used, swap the motor with one that works and see if that changes anything. If it does, then the motor's probably on it's way to the graveyard.

Other than that, I'd look in to the shimming.

Crunchmeister · March 8th, 2008, 23:46

Perhaps the motor may be seated incorrectly too. If it's too tight into the gearbox, that could slow it down. Had that problem with my C8 (TM M4A1 internals) too. Otherwise, I would say (from my limited experience) that the motor might be going of the gearbox is shimmed to tightly.

I'd start with the easy route and trying the motor height adjustment. If that doesn't work, then try swapping motors like Illusion suggested. If those don't solve the problem, then you'll have to tear into the mechbox.

Wilson · March 9th, 2008, 21:34

Alright, I tried the motor height adjustment and no change. Swapped the motor with a brand new TM EG100 and no change. Redid all the wiring and it got slightly faster, but still much slower than the brand new TM M4A1.

I'm going to bring this in to Syndrome and his crew in North Bay for them to have a look at. I may just end up getting one of those Systema drop-in gearbox solutions.

Amos · March 9th, 2008, 21:41

Sounds like it's overshimmed

CDN_Stalker · March 9th, 2008, 22:28

I'd say shimming or sticky piston after all that info.

ILLusion · March 10th, 2008, 04:06

I concur

Spa · March 11th, 2008, 01:08

rewired? and didn't bother to check the shims? oy i think rewiring is more work then re-shimming

ILLusion · March 11th, 2008, 03:48

Really? I think it's less work. But to each his own...

Spa · March 11th, 2008, 13:51

fair enough

CDN_Stalker · March 11th, 2008, 14:07

Custom wiring can be a real pain in the ass though!

Wilson · March 12th, 2008, 05:40

I have yet to crack open an AEG gearbox... that is uncharted territory. Seeing as this gun is apparently stock, then sticky piston sounds about right. How do I fix that?

Crunchmeister · March 12th, 2008, 12:25

This should help

http://www.mechbox.com/site/mechbox-...ade-video.html

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March 8th, 2008, 06:17	#1
Wilson Trader rating Join Date: Aug 2003 Location: Ottawa, ON	Possible Reasons for Slow Firing TM M4A1? I just recently picked up a bunch of TM M4A1's and one of them seems to be firing slower than the rest. On an 8.4v 1400mAh battery (I used the same one on all of them to compare), this stock M4 cycles at about half the speed of the others. What are the possible causes of this? I was told that it wouldn't be the motor, because those are usually either working or burnt out entirely. Sticky piston? Any assistance in this matter would be greatly appreciated. __________________ IN OMNIA PARATUS

March 8th, 2008, 15:43	#4
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	If it's used, swap the motor with one that works and see if that changes anything. If it does, then the motor's probably on it's way to the graveyard. Other than that, I'd look in to the shimming. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

March 8th, 2008, 23:46	#5
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	Perhaps the motor may be seated incorrectly too. If it's too tight into the gearbox, that could slow it down. Had that problem with my C8 (TM M4A1 internals) too. Otherwise, I would say (from my limited experience) that the motor might be going of the gearbox is shimmed to tightly. I'd start with the easy route and trying the motor height adjustment. If that doesn't work, then try swapping motors like Illusion suggested. If those don't solve the problem, then you'll have to tear into the mechbox. __________________

March 8th, 2008, 11:19	#2
Omi-san Trader rating Join Date: May 2007 Location: Montréal	I'd say tight shimming is the # 1 suspect. Number 2 would be too much electrical resistance.

March 8th, 2008, 11:19	#3
Cpl T. Syndrome Trader rating Join Date: Apr 2007 Location: Ottawa,On	Could be anything from mechanical to electrical.pretty much have to take the thing apart and have a look..pm commin

March 9th, 2008, 21:34	#6
Wilson Trader rating Join Date: Aug 2003 Location: Ottawa, ON	Alright, I tried the motor height adjustment and no change. Swapped the motor with a brand new TM EG100 and no change. Redid all the wiring and it got slightly faster, but still much slower than the brand new TM M4A1. I'm going to bring this in to Syndrome and his crew in North Bay for them to have a look at. I may just end up getting one of those Systema drop-in gearbox solutions. __________________ IN OMNIA PARATUS

March 9th, 2008, 21:41	#7
Amos Trader rating Join Date: Aug 2006 Location: Japan	Sounds like it's overshimmed __________________ Custom Builds: FA3674U Krinkov G3SD6

March 9th, 2008, 22:28	#8
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	I'd say shimming or sticky piston after all that info. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

March 10th, 2008, 04:06	#9
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	I concur __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

March 11th, 2008, 01:08	#10
Spa Trader rating Join Date: Oct 2006 Location: Winnipeg, Manitoba	rewired? and didn't bother to check the shims? oy i think rewiring is more work then re-shimming

March 11th, 2008, 03:48	#11
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	Really? I think it's less work. But to each his own... __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

March 11th, 2008, 13:51	#12
Spa Trader rating Join Date: Oct 2006 Location: Winnipeg, Manitoba	fair enough

March 11th, 2008, 14:07	#13
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Custom wiring can be a real pain in the ass though! __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

March 12th, 2008, 05:40	#14
Wilson Trader rating Join Date: Aug 2003 Location: Ottawa, ON	I have yet to crack open an AEG gearbox... that is uncharted territory. Seeing as this gun is apparently stock, then sticky piston sounds about right. How do I fix that? __________________ IN OMNIA PARATUS

March 12th, 2008, 12:25	#15
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	This should help http://www.mechbox.com/site/mechbox-...ade-video.html __________________

Possible Reasons for Slow Firing TM M4A1?

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