P90 not working

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LordRonin

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So I recently got a Cyma P90 and whenever I press the trigger I can feel the motor slightly move, but the gears won’t go anywhere.

i took the gearbox out of the shell of the gun and tested it to see if I could see any problems, what seems to be happening is that the piston isn’t being released after it does a full rotation, any idea how I could fix this? 

 
Does it do this with a freshly charged battery?  Have you tried another battery?

Have you released the spring tension using the anti-reversal latch?  YouTube should be able to provide a how-to for your gun.

 
I had this when I put a ball bearing Piston head and a ball bearing Spring guide in mine. Just not enough room in the compression area get the sector gear to clear the last piston tooth. I had to remove the ball bearing from the piston head. 

 
Asomodai said:
I had this when I put a ball bearing Piston head and a ball bearing Spring guide in mine. Just not enough room in the compression area get the sector gear to clear the last piston tooth. I had to remove the ball bearing from the piston head. 
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I think this is the problem, I tried testing it this morning before work by turning the gears by hand with no Spring in, and the piston doesn’t go far enough to clear the sector gear. So I’m going to remove the ball bearings from the spring guide when I get home and that should fix it

 
LordRonin said:
I think this is the problem, I tried testing it this morning before work by turning the gears by hand with no Spring in, and the piston doesn’t go far enough to clear the sector gear. So I’m going to remove the ball bearings from the spring guide when I get home and that should fix it
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Personally I think removing it from the piston head is better, but I cant explain why! 

So I am guessing this P90 has been upgraded before? The stock piston head does not have a ball bearing if I remember right. 

 
Asomodai said:
Personally I think removing it from the piston head is better, but I cant explain why! 

So I am guessing this P90 has been upgraded before? The stock piston head does not have a ball bearing if I remember right. 
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yeah, i put a new Piston, Piston head and spring guide in. and at the time i couldnt think for the life of me why it wouldnt work. but not looking back i can see the fault of having double ball bearings stopping you being able to cycle lmao

 
LordRonin said:
yeah, i put a new Piston, Piston head and spring guide in. and at the time i couldnt think for the life of me why it wouldnt work. but not looking back i can see the fault of having double ball bearings stopping you being able to cycle lmao
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All covered in my giant P90 build thread :)




 
Yeah so small update, I removed one tooth off the end of the sector gear and now it works perfectly ?

 
Thanks for letting us know, it's good to get a happy ending.

 
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