help with mp5 FTK

[snowball]

i just installed a mp5 FTK and when i pull the triger the spring compresses but does not realease any help would be welcomed.

[xaos]

Are you sure the spring is actually compressing?

What does it sound like?

[Munin]

It sounds like either a) your gear timing is off, or b) your piston isn't seated correctly. My guess is a), because usually a cock-eyed piston won't even go back all the way. Take your gearbox apart, make sure everything is intact, turn the bevel gear backwards until the anti-reversal latch stops it, then make sure that the little nub on the sector gear is in the 1 o'-clock position. This should be the configuration for the state where the spring is uncompressed and the tappet plate is all the way forward. If the sector gear is already exerting pressure on the tappet plate in the "at rest" position, your timing is off.

Did that help?

[Andree]

hey that may have helped me, i have had a similar problem... it does all that and doesnt shoot but sounds like the motor isnt getting enough tourqe. I gave it to viking and he said he took it appart a few times, so i doubt its the timing, but how is the piston supposed to be seated?

[xaos]

There's a little "track" on each side of the piston, and a rail inside either side of the 'box that should run inside that track if the piston is seated properly.

[Munin]

For what it's worth, it's really easy to get the piston out of its track when you put your gearbox back together. The problem is that the compressed spring tends to bend upward and "lift" the piston as you're trying to wrestle the top half of the gearbox back on. If you're not careful about it, you can easily reassamble the thing with the piston out of alignment.

The best way to avoid this problem is to maintain good downward pressure on both the cylinder and the spring guide as you put the top half of the mechbox back on. Granted, you'll feel like you need about four hands to do this, but with a little practice it becomes easier.

[snowball]

ill give playing with the gears a shot, it seems like the tapet plate is in the way and stoping the gear

[Bigmack]

The gears are supposed to pull back the tappet plate with each cycle.

Theres a round post on the topmost gear that pulls back the plate with each shot.

Best advice i can give... make sure it pulls it back... if it does, it should be fine.

[snowball]

its not pushing the tapet plate back.... when the post gets to the plate it just stops like its too hard for it to keep going(happens if i sping the gears by hand or with the motor)

[Munin]

Uh, is the tappet plate itself in its track? Is there anything obstructing it? Is there anything obstructing the nozzle from moving forwards and backwards on the brass front end of the cylinder? The tappet plate should slide back and forth smoothly.