weird gearbox noise

[BALBOSA]

believe it or not my gearbox makes a weird spring noise on single....I KNOW FANCY THAT its like theirs a spring in it or something, but jokes aside its not the normal sound a gearbox makes so why would it make a "dooing" sound every time it fires?

[The Keeper of Secrets]

Re: weird gearbox noise

That's not all the unsual. Your spring may be only the length of its seating, meaning that it is slightly loose when decompressed.

[euf0nia]

Re: weird gearbox noise

Yeah I agree
Is your spring cutted? Or short?

[johnnyj]

Re: weird gearbox noise

i have known broken springs do the same aswell

[BALBOSA]

Re: weird gearbox noise

that may be the answer it may be shorter than its seated position it was quite a small spring could any of the components touching the spring cause it? e.g piston head?

[euf0nia]

Re: weird gearbox noise

Probably!
The spring touch the piston, piston head, spring guide and gearbox!
Have a look at this video (see the vibration of the spring):
http://www.youtube.com/watch?v=fP9PH...eature=related
What you can do is:
1) Change the spring
2) Try to put some shim on the spring guide
3) Change the spring guide with a ball bearing spring guide