My LED Quacks

[biggie balla]

I bought my LED about 3 months ago and just recently when i shoot it makes a sound similar to the quack of a duck. I had it looked at but the said nothings wrong. Also during rapid firing, it has a huge drop in velocity. I think these two problems are connected but i'm not sure.
Thanx for your help.

[Jedrith]

Check the LPR pressure for drop off...the "quack" might be from the dwell control "pot".

[Emmit]

check your LPR for the drop off, and check your snap ring for the weird noises

[biggie balla]

I've fixed the quack, It was my dwell settings. I adjustedit and it went away in a couple of adjustments. but I'm not sure on how to adjust the LPR.
Thanx

[Jedrith]

There are shimms or little metal discs in the lpr that adjust the pressure...its goes 2.5 psi pre shim.

[biggie balla]

thanx for your help guys