Sitting Duck

This guys so funny however I do feel like it's self harming xD 

Kids not going back to school ???
it happens during July~August
 
no offence to younger players out there
but just shedding some light out there
to possible reasons - Detective Inspector Duck
 

Yup, quick and easy. I had 0 trouble with it. 

haha aye *epic film*!
 

was more for the jam protection i was gonna throw it in ther but will go the hard wired route on it when something breaks and have a reason to open her up as really dont fancy trying to add a diode lol

Didn't win anything - just guesswork
but we've all broke shit lots of times in many different ways
 
THIS is my favourite of favourite pic that sums up
diagnosing shitty bastid toy gun issues....
 

 
poor OP won a fucked piston & lost his posting ability
whilst having to wade through all my crap instead - ouch that's gotta hurt
 
 

amen brother

"never attribute to malice that which can be adequately explained by incompetence"
 
 
cheap gun with a bit of tlc can be a right laugh, still have my wee jg ticking along rightly even if it looks a little worse for wear these days.

yes that's the one i meant, i'm gonna blame gate's naming schemes rather than my bad memory

yeah ididnt think it would be quick spring yeah have seen a few vids on taken those ones apart now
 
i think ill just wait like u said no point taken 2 apart and having non on the go
 
oh i know bud its more for the future dmr i plan to build but would throw in the 516 till i start that
 
yeah bud will be keeping it simple just now just the piston change on the 621 then when shit breaks ill replace as an when needed

Well as explained (briefly - *sarcasm)
 
the KIT offers excellent value - nuff said
but as explained the nozzle may wobble
the piston "might" bind (it might not)
the cylinder only available in full or half type
(as said you got the correct cylinder in there about 3/4
though at times the type in fractions or type A-B-C-D is a bit vague
I prefer to measure the distance of port to front say 43mm)
The piston head is alloy - but a good type for compression
yet some prefer lighter and possible less risk of scratching POM piston head
(I've always said give same gun to say 10 techs and they will all have their preferences
of what to change, what keep etc... how far to take stuff on what budget etc...)
 
waffling again
 
The kit offers very good value - don't think anybody can deny that
(price it up separately & see for yourself)
The issue is one or two components might not be best suited as is for the Cyma v2
(nozzle is one example, it might fit OK but RA is oem SHS so reckon it will be a little loose)
 
Don't get me wrong - you could buy just the basic Cyma piston & new o-ring
AND the KIT for a future gun or if the other gun went tits up
and you was fine doing some minor checking/minor modding to ensure it went together OK
 
I'm just pointing out the options and the value in the kit
(get full cylinder perhaps & you can make it ported if you wished to your spec)
I'm not saying deffo get the kit - I don't know what your budget of toy gun shit is
(especially in January after Chrimbo cleared you out)
 
If funds are tight just get the piston & o-ring
if you're OK or had money to splash then get kit as well PERHAPS
 
Now at risk of pissing Pete off - he's gonna fucking kill me
you could ask Pete via pm/facebook or whatever to measure the piston
between the rails to check dimensions and see if it is much thicker than Cyma
or a bit thinner than SHS pistons that often bind in some boxes
(that way you might know if it will bind or just need a light sand to glide smoothly)
it's not just between the rails, but the rails themselves how much they protrude
but some pistons bind a bit & some bind a lot that effects its efficiency (even risks PME)
 
SHS pistons I have are 19mm between rails
(a smidge under/over at either end)
Cyma metal rack pistons are say 18.15mm aprox
with the pinky ones being 18.4mm to 18.55mm say
(so as said they sit inbetween SHS & Cyma pistons)
 
I dunno what Pete's XT or even ZCI pistons are
but highlighting why some pistons bind in some boxes etc...
 
The XT piston could be fine, not as fat as bindy SHS
I really don't know - but SHS can bind in Cyma/JG's
and Cyma pistons can be a little wobbly in say a G&G box for my liking
 
as said this "Tokyo Marui Compatible" is more like compatible-ish at the best of times
 

 
yeah might need a "slight" mod there m8
 
I mean for starters to see if I'm talking out my arse a sec
you can grab some plumber's ptfe tape
wrap around 7 wraps around the cylinder head and retest to check seal
(it is a BODGE, but does work if done neatly - trim off excess with scalpel etc...)
 
the o-ring, you can remove and wrap it around the outside of cylinder to stretch it
(some warm the rubber, some leave it on cylinder for weekend/week to naturally stretch a little)
but a new better fitting o-ring is best as the Cyma one is a bit small to begin with
 
do that crap - test compression, see if it improves for next to nothing
heck you can test for leaks at cylinder head in a bowl/sink of water looking for puncture
(nozzles will never seal 101% as they gotta move freely so will blow slightly under pressure
even with an o-ring or double o-ring or they struggle to glide free & smoothly)
see if that improves compression
but you will need a new or stretched o-ring at least to check compression
(coz the std one is a bit shit)
and the cylinder head OMG Cyma it is as loose as fuck - plenty ptfe required
but can do the trick on budget without buying numerous bits that you don't REALLY need to
(Just Cyma - the fucking head is a bit too loose compared to some makes)
 
You can get by with mostly stock stuff and get these to sing quite well
(like Luke at NA does so often)
I've covered the extra work regarding SHS nozzle & tappet plate in Cyma's
I normally use plastic cylinder heads if I can get them to seal well
others will replace with alloy head etc...
then some nozzles are a too tight fit on some spouts or vice versa
so then I might change stuff around or go to plan B etc...
 
again waffling & over thinking shit, but I got a box of bits n bobs spares to swap shit around
I'm giving you the heads up, what options there are and offering you the simple straight forward approach
plus mindful of not buying more stuff than is really necessary to get it going too
 
As said, not wishing to piss Pete off (much)
but say if he popped the XT piston in say a JG v3, Cyma v3 if he hasn't a Cyma v2 shell to hand
(that's another fucking annoying thing about Cyma v2's, they got a smaller cylinder window
that a bare piston won't fit through on its own like most v2's to test if a piston might bind)
if the piston doesn't bind in a JG/Cyma v3 box then chances are it "shouldn't" bind in Cyma v2
 
if that be the case you could buy the kit and use most of it - nozzle might not wobble (but think it might)
but use most bits - though get a couple of o-rings - one for the other gun at some point
 
As for the other gun - if it shoots OK then LEAVE IT ALONE
you could swap barrel/hop/bucking combo over to test/try if they are similar length
but I'd avoid stripping down both or fucking around too much - always leave one gun working
(plus if it ain't broke (or not too bad) then don't try to fix it)

Yes this is most common fail, basically pneumatic lock
 
“Seems like the hop might have caused a BB to jam than actual speed
which resulted im PME piston shredding”
 
One of the reasons 6.00 / 6.01 barrels are daft too. Dirty jam.

Kids not going back to school ???
it happens during July~August
 
no offence to younger players out there
but just shedding some light out there
to possible reasons - Detective Inspector Duck
 

Can't accuse me of composing very brief & vague posts
 
just bored shitless & very very very sad

@Adolf Hamster no need, @Sitting Duck writes the guide every time he posts 😘
 
I love how every time the ‘I want to put a new spring in’ spirals into full blown custom box

i know what you mean though, it's impossible to make the complete guide for everything because every part and every gun is subtly different, things change over different batches etc etc.

personally i prefer "the master has fucked up more times than the apprentice has even tried"
 
 
i still think one of these days we just need to go through your post history and stitch together a proper "how to gearbox" guide
 
 
yeah, you do have to stay on top of cleaning with the tighter bores, but then regular cleaning is still the best cost/performance ratio "upgrade" for any gun.

Didn't win anything - just guesswork
but we've all broke shit lots of times in many different ways
 
THIS is my favourite of favourite pic that sums up
diagnosing shitty bastid toy gun issues....
 

 
poor OP won a fucked piston & lost his posting ability
whilst having to wade through all my crap instead - ouch that's gotta hurt
 
 

ahh yes, see the status update. so my spring theory was wrong.
 
you win this time duck

look i have the ability to self-jetlag under normal circumstances and lockdown aint helping

Going from your other thread you're running that thing on 11.1v
 
In which case i reckon @Sitting Duck is spot on about the pme but i'm wondering if this is a weak spring as the culprit.
 
ive seen a cyma eat a piston like that was fresh out the box, 11.1v but a half-assed "fps downgrade" by the shop with it spitting out 0.5j had the piston chewed up bad within 30 minutes (weak spring means it doesnt have to be spinning as fast for pme to be an issue so the stock motor on a hefty battery was fast enough)
 
When you get the new piston in might be worth checking the fps. If you get very consistent (ie each shot doesnt change much in fps) but low readings then that might be your culprit.
 
Dont know how confident you are with tinkering but there's a few tips and tricks for dissassembly/gearbox checks here:
You dont need to go ham with trying to change things like aoe/shimming etc just yet, Just keep the shims in the positions they were originally. but at least that should let you know what to expect so you dont end up with a spring guide pinging its way into the aether the moment you pop it open.
 
Of course this is assuming the gearbox is all stock and this isnt as simple as the previous owner dropping a spicy motor in there.

ach one of the joys of taken a pre owned gun i suppose
taken all on board bud will replace the piston and go from there when something else breaks thank you
very true you can only polish a turd so far i suppose lol
 

Bit of a cunt
it is all a bit of a shame
 
it is a clickbait video
bit of sponsorship perhaps...
 
https://www.switairsoft.com/product-page/kwa-m11a1
 
links to his channel/games
at times he plays well has to put up with others not calling hits etc...
(in longer clip - but marshal says he would of hosed them, yeah but there are degrees of hosing)
 
but then he creates a much shorter clip to trigger the haters
but still gets the clicks on YT
 
he could have made a better video to demonstrate the gun
but chose to make one that triggers people - thus increasing his clicks/views etc...
 
at times we have all done dick things - hand on heart
but to make video of it for clicks n stuff - well that is quite sad tbh

bullpup rpk innit
 
 
or for those of us who cannot understand a concept unless stated in meme form:

Whoa whoa whoa...
 
was there a handbag fight & nobody invited me ???
 
now I'M PISSED - ya toxic cows