ICS MP5 drop in power

[brewer782]

hi,
i've just finished changing the switch block and installing a new piston in my mp5 and it's found a new problem... could really use some advice. Basically the power's dropped through the floor; the bb's roll out of the end if they even come out at all. I've had it apart and put it back together again looking for some stupid mistake i made in the gearbox but found nothing... anyone have any ideas?
Thanks
Andy

[jagillham]

Re: ICS MP5 drop in power

Air nozzle clipped into tappet plate correctly?

Does it sound ok?

[brewer782]

Re: ICS MP5 drop in power

yus it sounds fine and couldn't see a problem with the air nozzle

[jagillham]

Re: ICS MP5 drop in power

You can tell from outside usually. Should not wobble, or be able to push back and forth without feeling the spring resist.

[brewer782]

Re: ICS MP5 drop in power

yeah it seems fine

[jagillham]

Re: ICS MP5 drop in power

Does the piston move freely along the rails?

If you put your finger over the cylinder head nozzle, can you push the piston into the cylinder?

[brewer782]

Re: ICS MP5 drop in power

the piston does move along the rails, it appears to cycle as normal... I cant push the piston into the cylinder using the air nozzle though... it goes in about 5mm and stops

[jagillham]

Re: ICS MP5 drop in power

Goes in fine without your finger over the nozzle right?

Have you knocked the hop on too far?!?

[brewer782]

Re: ICS MP5 drop in power

yeah it seems to move ok. I though of that first so tried the hop full on, full off, medium and then just some random positions... nothing made a difference
thanks for the help :D

[jagillham]

Re: ICS MP5 drop in power

Hmmmm, how strange! It is only the piston you changed?

[brewer782]

Re: ICS MP5 drop in power

and the switch block... i did a bit of cleaning and regreasing while i was in there too but it seems to cycle ok so figured that can't be the issue

[jagillham]

Re: ICS MP5 drop in power

None of that should effect the power. Even if the gears turned at a snails pace, it would still release with the same speed!

I guess the old piston was broke, so can't check that out?

[brewer782]

Re: ICS MP5 drop in power

yeah it was totally nackered, had a massive hole where the teeth used to be!

[jagillham]

Re: ICS MP5 drop in power

I'm at a loss really!

Last thing to try, remove the spring and rebuild. See if you can move that piston with the casing complete.