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I need some help, SR10 Whine/Problems - All Stock


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#1 physikal

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Posted 09 August 2013 - 10:34 PM

It all started when my anti-reversal latch spring busted and chipped a tooth on my spur gear.

I replaced both the spring and the spur gear with stock KWA parts.  Now the gun has a very loud and scary whine to it when firing.  I tried backing out the motor screw thinking that might be it, but that doesn't even seem to make a difference. In fact, even with the motor screw fully backed off, it still fires (which I thought was odd).

The other thing I thought it might be was the shimming, but I have not touched the shims from factory setup, and the gun is only 2 months old.  The only shims in place is 1 on the spur gear and 1 on the sector gear.

Any suggestions would be greatly appreciated!

Thanks in advance.

#2 niko_gpsy

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Posted 10 August 2013 - 02:17 AM

chech the sector and bevel gear teeth closely under a lamp and with magnifying glass if you need to. I have a feeling that the busted spur gear may have bent the teeth on the other gears. The damage may look too insignificant to notice at first but a closer look may reveal that this may be the case.

#3 gcw360

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Posted 10 August 2013 - 05:59 AM

This is a long-shot but are you sure that you put the motor wires in the pistol grip correctly.  If the motor alignment is off it can cause a whining noise.  This happens all the time with motor grips that are aftermarket like the MAGPUL MOE.

#4 physikal

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Posted 10 August 2013 - 07:01 AM

Sector gear looks perfect.

What is the right way to put the wires in the pistol grip? I believe it's in there right but I'm curious now if I did do it wrong. I do feel I have a bit too much slack on the red wire so it's kind of coiled up on the butt of the motor.

#5 gcw360

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Posted 10 August 2013 - 07:23 AM

View Postphysikal, on 10 August 2013 - 07:01 AM, said:

Sector gear looks perfect.

What is the right way to put the wires in the pistol grip? I believe it's in there right but I'm curious now if I did do it wrong. I do feel I have a bit too much slack on the red wire so it's kind of coiled up on the butt of the motor.
That may be the issue.  See here: http://www.kwausa.co...?showtopic=2611


Watch the video and then read below.

Note that both wires come up the back of the pistol grip as you look down on it with the barrel facing left.  The orientation of the back of the grip now being at 3 o'clock. The black wire comes up at 4 o'clock on the grip.  The red wire at about 2 o'clock.  To get the red wire to do this it needs to be fed from the were it enters the grip, from the gearbox, on the left over to the right side.  The best way I can describe it is the red wire enters the grip on the left at 9 o'clock, travels inside the grip over at 12 o'clock, and comes up the side of the grip at 2'oclock.  The black wire comes straight up at 4 o'clock.  Does this make sense?

There should be a groove in the back of the grip.  I keep the red wire on top at 2 o'clock and the black wire below it at 4 o'clock.

Hope this helps. And please let us know the outcome.

#6 physikal

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Posted 10 August 2013 - 09:10 AM

Ill give this a shot as soon as I get home.

#7 physikal

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Posted 10 August 2013 - 07:46 PM

Wow I feel like an idiot. The wires were the problem thanks so much!

#8 gcw360

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Posted 10 August 2013 - 08:15 PM

View Postphysikal, on 10 August 2013 - 07:46 PM, said:

Wow I feel like an idiot. The wires were the problem thanks so much!
Don't feel put off over it.  It's how we learn...and it's a whole lot better than needing new gears!  Thank you for letting us know the outcome.

#9 vanevery

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Posted 10 August 2013 - 08:44 PM

gcw360 knows his stuff, as well as niko_gpsy and the other mods. Hang out more on the forums and you will learn a lot. Happy Airsofting

Edited by vanevery, 10 August 2013 - 08:46 PM.


#10 gcw360

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Posted 10 August 2013 - 08:50 PM

View Postvanevery, on 10 August 2013 - 08:44 PM, said:

gcw360 knows his stuff, as well as niko_gpsy and the other mods. Hang out more on the forums and you will learn a lot. Happy Airsofting
Thank you...




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