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Gen1 KM4A1 Not Firing (Help Appreciated)

KM4 Gen1 Gen 1 Not firing problem

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#1 CerealKiller

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Posted 15 February 2014 - 02:28 PM

Hello. I am the proud owner of a 1st generation KWA M4. It has held up extremely well over the years and still looks new on the outside. I've never run a lipo in it, and haven't touched the internals at all since it was originally purchased in 2008. Recently, while firing on full auto with a 9.6v nimh battery, the gun skipped a few shots, subsequently fired ~6 BB's at once, then quit firing altogether. Now, when I pull the trigger, the trigger moves back normally, but the gun doesn't fire at all. The trigger feel a tad loose and limp while not on semi. Semi still works as it should, preventing the trigger from being pulled back all the way.

Does anyone have any idea what could be wrong and what I should do to try to fix the issue. I appreciate your responses.

#2 vanevery

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Posted 15 February 2014 - 10:25 PM

Troubleshoot:

- Make sure the battery is fully charged.
Test it in other guns to ensure your battery is good.

- Try a second battery to see what happens.

- Check all your electrical connections.
Battery/wire connection.
Fuse connections.
Fuse itself.
Motor Terminals
1.Temial slipped off of Post.
2. Broken Terminal.

- It is possible your trigger post broke off based on what you describe.
That would require opening the gearbox to DIY fix or replacing the gearbox shells.

Edited by vanevery, 16 February 2014 - 12:22 AM.


#3 CerealKiller

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Posted 16 February 2014 - 04:53 PM

Thanks very much for your response. Fuse, battery, and motor connection are all good. Sadly, I think the gearbox shell is issue, since all other possibilities were tested negative.

Edited by CerealKiller, 16 February 2014 - 04:54 PM.






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