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Over spin?


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#1 Jesse Hammil

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Posted 30 January 2014 - 07:33 AM

Hey guys,  I put a new 11.1v lips in my ris last night and it seems it has over spin. The piston cycles too far. I also adjusted the motor height. I assume it's over spin. I am wondering if it is harmful for the gun.  I'm planning on building an ab mosley.  The building of it i am Co for table with,  but do you wire it in to the gun?  Is an ab mosfet even needed or is there another fix?

#2 BLATEY

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Posted 30 January 2014 - 08:42 AM

This is what I found if it's any help to you, http://www.airsoftfo...2&mode=threaded
I don't know AEGs like you guys do.

#3 Larry

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Posted 30 January 2014 - 09:07 AM

Your spring will be weakened sooner due to the fact it is compressed all the time. Trigger response will be slower and piston will wear sooner. Due to sector gear starting up in middle of pistion with a lot of spring tension, and strong start of the motor because of the 11.1. You may not notice the missing trigger response because you have a 11.1 in there, but still there. Mosfet will help, and to get full advantage of the  mosfet ( really hear your gun sing ) you'll need to bypass the trigger, that will involve taking your gear box apart. But lots of people just install the battery and gun goes for a good while or breaks soon depending on output of battery, internals, ect . How far do you want to go is up to you.

Edited by Larry, 30 January 2014 - 09:37 AM.


#4 Jesse Hammil

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Posted 30 January 2014 - 11:03 AM

Can you explain a little about bypassing the trigger?  I ha e been looking for a reason to open my first gear box :)

#5 Larry

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Posted 30 January 2014 - 01:12 PM

You will have to open the gear box and desolder one of the positive wires on the trigger.  Then solder it to the the other one that is still slodered to the trigger. Kind of piggy back like. Lots of vids and picks on google. Lots of ways to do it. My Gate mosfet alowded me to desolder both wires from trigger and solder them together. It used a two wire signal system, that you solder back where the removed wires went. Mosfet comes with very complete instructions. That along with a 7.4 2200mah, did wonders for my ROF and trigger response, over no mosfet and 9.6 . Thats not the hard part. You will have fun trying to keep the gears, spring, AR latch all in place while reassy of box. Dont loose the shims, dont mix them up if your not going to reshim. The first time you open and reassamble a box can be frustrating, as im sure a lot of people here will agree with. Good luck a lot of people have messed up their guns. Good luck.

#6 Larry

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Posted 30 January 2014 - 01:27 PM

Dind't mean to get too winded there, you will still be using your trigger as contacts. Trigger will just be useded as a low current on/off signal switch, it will turn the mosfet on and off. The mosfet will carry the heavy on/off load of the battery to the motor.

#7 tales

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Posted 30 January 2014 - 02:58 PM

KWAs V2 gearbox uses a V3 spring guide, the spring shouldn't pop out.

This cured my overspin. Page four:  "Installation of PicoAB with replacement wires"
http://www.jbbguns.s...b702-picoab.pdf

Trigger bypass: Red 20AWG wire on right has a 20AWG black under it. This is connected to the trigger switch, the 20AWG is spliced into the 16AEG battery/motor wire on the left. This leaves three wires exiting the gearbox into the mosfet instead of four.
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Fits in buffer tube
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Edited by tales, 30 January 2014 - 03:01 PM.


#8 Jesse Hammil

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Posted 30 January 2014 - 03:14 PM

Nice,  thanks guys.

Edited by Jesse Hammil, 30 January 2014 - 03:14 PM.


#9 tales

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Posted 30 January 2014 - 03:15 PM

View PostJesse Hammil, on 30 January 2014 - 03:14 PM, said:

Nice,  thanks guys.

Yeah, it stopped the overspin.

#10 iWar

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Posted 05 February 2014 - 02:05 PM

You can also just install a stronger spring if your not at your field limited yet... Then you get higher fps and no over spin... A fet is still a good idea though...

Edited by iWar, 05 February 2014 - 02:06 PM.


#11 tales

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Posted 05 February 2014 - 02:18 PM

View PostiWar, on 05 February 2014 - 02:05 PM, said:

You can also just install a stronger spring if your not at your field limited yet... Then you get higher fps and no over spin... A fet is still a good idea though...

Its at the limit with a M 105 spring

#12 Jesse Hammil

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Posted 05 February 2014 - 03:29 PM

I ordered the parts to make the AB Mosfet from the Modification forum. Making the mosfet I'm comfy with, installing it is another story.... :D

#13 iWar

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Posted 05 February 2014 - 08:44 PM

View Posttales, on 05 February 2014 - 02:18 PM, said:

Its at the limit with a M 105 spring

My field limits where I live is 400 fps w/ a .25... I run all G&G M130 and puts me at 390-400 once its broken in...

#14 Jesse Hammil

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Posted 05 February 2014 - 09:34 PM

Our field is 400 fps with .2s I was 380 before my new barrel,  I might be over as it is.




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