Cyma MP5

[matas17]

So i have recently got an mp5 from my mate that he doesnt use. And me being me i installed all upgrades i could get:

14 tooth steel tooth piston/ shs piston head

SHS double oring air nozzle 21.4mm

double oring cylinder head

3/4 cylinder

13:1 shs gears

SHS gear delay chip

SHS HT motor

Gate Titan

But i am stuck right now as the gun doesnt feed at all no matter what i tried. I dont know if its an air nozzle or what but i have tried everything. Any advice would be helpful.

 

[Armo1000]

Moral of the story, don't bother with upgrades ?

 

[Asomodai]

So i have recently got an mp5 from my mate that he doesnt use. And me being me i installed all upgrades i could get:

14 tooth steel tooth piston/ shs piston head

SHS double oring air nozzle 21.4mm

double oring cylinder head

3/4 cylinder

13:1 shs gears

SHS gear delay chip

SHS HT motor

Gate Titan

But i am stuck right now as the gun doesnt feed at all no matter what i tried. I dont know if its an air nozzle or what but i have tried everything. Any advice would be helpful.

Why have you gone with an M4 air nozzle? MP5's usually have a 20.3mm and the K version Is even shorter (Some of them anyway). No wonder its not feeding. 

 

[ak2m4]

I've just finished working on a CYMA MP5K.  The stock plastic nozzle was 21.6mm and a SHS 21.4 worked fine.  What was the stock nozzle length on yours?

 

[matas17]

I've just finished working on a CYMA MP5K.  The stock plastic nozzle was 21.6mm and a SHS 21.4 worked fine.  What was the stock nozzle length on yours?

I bought 21.4mm air nozzle from ak2m4.co.uk and iit had 21.4mm nozzle but still won't fire. It shoots like once in a while. I had bbs roll out of a barrel so I assume nozzle is too short don't think it could be too long. 

 

[ak2m4]

I bought 21.4mm air nozzle from ak2m4.co.uk and iit had 21.4mm nozzle but still won't fire. It shoots like once in a while. I had bbs roll out of a barrel so I assume nozzle is too short don't think it could be too long. 

what was the length of the stock nozzle you were replacing?  

 

[matas17]

what was the length of the stock nozzle you were replacing?  

21.4mm

 

[ak2m4]

21.4mm

next thing for you to check is the hop chamber and bucking, make sure it's all fitted correct.  put everything back together, remove mag, turn upside down, shine a light down into the feed tube and fire.  You should see the nozzle move back and forth into the chamber.  failing that let a tech take a look

oh also is the double o-ring really tight on the cylinder head shaft?  if so make sure it's greased really well, also you can remove one of the o-rings.  

those double o-ring nozzles aren't for every build, on some builds they can create too much resistence

 

[matas17]

next thing for you to check is the hop chamber and bucking, make sure it's all fitted correct.  put everything back together, remove mag, turn upside down, shine a light down into the feed tube and fire.  You should see the nozzle move back and forth into the chamber.  failing that let a tech take a look

oh also is the double o-ring really tight on the cylinder head shaft?  if so make sure it's greased really well, also you can remove one of the o-rings.  

those double o-ring nozzles aren't for every build, on some builds they can create too much resistence

Air seal is 100% and I already checked the hop unit and had it fit well all together, I checked air nozzle last bight and it moves back and forth as gun fires. So atm I'm clueless right now. 

 

[ak2m4]

try removing the delayer
try running with 7.4v
 

 

[matas17]

try removing the delayer
try running with 7.4v
 

Might try different length air nozzles. 

 

[matas17]

try removing the delayer
try running with 7.4v
 

I sorted out the issue but fps keeps jumping from 260-318 on 0.2g bbs but i think thats an issue with hop unit since its cyma because air seal is 100%