My first posting/question. I do apologize if I am in the wrong place. I have a US Military PL55A made by Remington made on 4-73, serial number 1582. I got the saw with the starter parts missing and after getting the necessary parts the saw when the starter cord was pulled if did pull pretty much the same as my PL5. However, after firing for the first time with fuel it become very hard to pull the starter cord and it acts as it has too much compression. Pulling hard on the cord it goes over TDC and then backfires. I have checked and read every thing that I can think off or found and I found that a decompression was available only on the PL55A but, I have not been able to find such a valve or how it was activated. I was going to take the throttle handle apart but, after coming close to losing my fingers again I thought to better ask for your help and advise. I would like to thank you all of you not only for you help but, most of all for sharing your knowledge and experience.