upgraded MP5k not firing

fi3re · May 29th, 2010, 05:15

Here are the specs:

TM MP5k
CA gears- shim job done until gears have no play and can spin smoothly
CA "100 m/s" spring (m100 i believe)
CA Bearing spring guide
CA bearing piston w/ silent piston head

G&P M120 high speed motor
8.4v mini stick battery

The gun was firing fine stock. After upgrading, the gun would pull the piston partway and then fail to cycle. Im thinking it could be spring guide getting in the way of piston traveling backwards fully so I chamfered the inside of the piston. Didnt fix it. Manually turned the gears until it fired so it seems to be a problem with power.

Is there something wrong with my power setup?

Styrak · May 29th, 2010, 08:36

Use a stronger battery.
That's probably your only problem (unless it's shimmed badly as well)

Con Murder · May 29th, 2010, 13:54

Probably your battery.
M100 with my 8.4v nimh 1100mha was a slow chug of a rof no semi-auto, dropped in a MarkIII trigger master and it was not going to move at all. Swapped it for a m110 and grabbed some lipos and all is right.

fi3re · May 29th, 2010, 14:02

what would constitute being shimmed badly? I have never shimmed before, but I spent about an hour getting the gears the perfect distance from each other and little play side to side. The gears spin completely freely when not connected to anything.

Oh right I forgot to add the battery is an old marui 8.4v nicad battery so the life is probably almost done. But it just seems weird that the mechbox would bind with a M100 spring....

Styrak · May 29th, 2010, 14:03

Again, it's your battery.

Plain and simple. Not enough power.

fi3re · May 29th, 2010, 14:08

Ok what would you recomend me do? only a stick mini fits in the k...

thanks

Spike · May 29th, 2010, 14:13

get a new mini stick battery? NiMh batteries are not only more durable, but have a higher mAh rating then shitty NiCAD batteries.

www.cheapbatterypacks.com

This site makes for great group orders, as it has free shipping over a certain amount.

I'd recommend the 1500 mAh ELITE cells, because they're awesome. Oh, and while you're at it, switch to deans connectors if you haven't already

fi3re · May 29th, 2010, 14:22

thanks, Ill check it out

Yes I will switch to deans connectors asap

Do you think a TM MP5k with my setup is ok to run a 11.1v stick lipo? Would it chew up the mechbox quickly?

Spike · May 29th, 2010, 14:26

I would not advise it, especially with a Classic Army piston. A 9.6 would do fine.

fi3re · May 29th, 2010, 14:32

9.6v lipo? I cant fit a 9.6v nimh or nicad in my gun....

Spike · May 29th, 2010, 14:35

I meant 9.6 NiMh. If you want to do a lipo, I would only suggest a 7.4, as I'm pretty sure an 11.1 would bust your piston, at least.

But, I'm no means an expert, so keep checking

Styrak · May 29th, 2010, 20:10

Quote:

Originally Posted by fi3re

Ok what would you recomend me do? only a stick mini fits in the k...

thanks

Get a better battery like a new Intellect or Elite 1500/1600mAh stick.

fi3re · May 29th, 2010, 20:25

got 1500 mah batt now it works! sigh thats a relief....
also got deans connectors

thanks for the help

as a side note...just to confirm, a 7.4v lipo typical specs would give higher rof than 8.4v mini 1500mah am i correct?

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May 29th, 2010, 05:15	#1
fi3re Trader rating Join Date: Aug 2008 Location: Tdot scarberia	upgraded MP5k not firing Here are the specs: TM MP5k CA gears- shim job done until gears have no play and can spin smoothly CA "100 m/s" spring (m100 i believe) CA Bearing spring guide CA bearing piston w/ silent piston head G&P M120 high speed motor 8.4v mini stick battery The gun was firing fine stock. After upgrading, the gun would pull the piston partway and then fail to cycle. Im thinking it could be spring guide getting in the way of piston traveling backwards fully so I chamfered the inside of the piston. Didnt fix it. Manually turned the gears until it fired so it seems to be a problem with power. Is there something wrong with my power setup?

May 29th, 2010, 08:36	#2
Styrak Trader rating Join Date: Jan 2007 Location: Saskatoon, SK	Use a stronger battery. That's probably your only problem (unless it's shimmed badly as well) __________________ Airsoft Sales and Repair/Upgrade Services

May 29th, 2010, 13:54	#3
Con Murder Trader rating Join Date: May 2009 Location: Lethbridge Alberta Canada	Probably your battery. M100 with my 8.4v nimh 1100mha was a slow chug of a rof no semi-auto, dropped in a MarkIII trigger master and it was not going to move at all. Swapped it for a m110 and grabbed some lipos and all is right. __________________ Con Murder Dark Rhino L.A. Airsoft

May 29th, 2010, 14:02	#4
fi3re Trader rating Join Date: Aug 2008 Location: Tdot scarberia	what would constitute being shimmed badly? I have never shimmed before, but I spent about an hour getting the gears the perfect distance from each other and little play side to side. The gears spin completely freely when not connected to anything. Oh right I forgot to add the battery is an old marui 8.4v nicad battery so the life is probably almost done. But it just seems weird that the mechbox would bind with a M100 spring....

May 29th, 2010, 14:03	#5
Styrak Trader rating Join Date: Jan 2007 Location: Saskatoon, SK	Again, it's your battery. Plain and simple. Not enough power. __________________ Airsoft Sales and Repair/Upgrade Services

May 29th, 2010, 14:08	#6
fi3re Trader rating Join Date: Aug 2008 Location: Tdot scarberia	Ok what would you recomend me do? only a stick mini fits in the k... thanks

May 29th, 2010, 14:13	#7
Spike Privateer Airsoft Trader rating Join Date: Dec 2008 Location: Beaverbank, NS	get a new mini stick battery? NiMh batteries are not only more durable, but have a higher mAh rating then shitty NiCAD batteries. www.cheapbatterypacks.com This site makes for great group orders, as it has free shipping over a certain amount. I'd recommend the 1500 mAh ELITE cells, because they're awesome. Oh, and while you're at it, switch to deans connectors if you haven't already __________________ I change primaries like other people change socks.

May 29th, 2010, 14:22	#8
fi3re Trader rating Join Date: Aug 2008 Location: Tdot scarberia	thanks, Ill check it out Yes I will switch to deans connectors asap Do you think a TM MP5k with my setup is ok to run a 11.1v stick lipo? Would it chew up the mechbox quickly?

May 29th, 2010, 14:26	#9
Spike Privateer Airsoft Trader rating Join Date: Dec 2008 Location: Beaverbank, NS	I would not advise it, especially with a Classic Army piston. A 9.6 would do fine. __________________ I change primaries like other people change socks.

May 29th, 2010, 14:32	#10
fi3re Trader rating Join Date: Aug 2008 Location: Tdot scarberia	9.6v lipo? I cant fit a 9.6v nimh or nicad in my gun....

May 29th, 2010, 14:35	#11
Spike Privateer Airsoft Trader rating Join Date: Dec 2008 Location: Beaverbank, NS	I meant 9.6 NiMh. If you want to do a lipo, I would only suggest a 7.4, as I'm pretty sure an 11.1 would bust your piston, at least. But, I'm no means an expert, so keep checking __________________ I change primaries like other people change socks.

May 29th, 2010, 20:25	#13
fi3re Trader rating Join Date: Aug 2008 Location: Tdot scarberia	got 1500 mah batt now it works! sigh thats a relief.... also got deans connectors thanks for the help as a side note...just to confirm, a 7.4v lipo typical specs would give higher rof than 8.4v mini 1500mah am i correct?

upgraded MP5k not firing

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