MS 171. What is the compression supposed to be?

Should be 192psi - 171 psi and they should be within at least 15psi of each other.

Yes there is :>D

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See the link to the pdf doc attached. http://www.lsengineers.co.uk/media/pdfs/stihl/MS171.pdf

http://www.mediafire.com/view/oa7j3va11bd91qe
hope this helps you

The compression is not the problem, it's possible that you just got a defective coil or there may be an intermittent problem with the #4 fuel injector, the P0171 will come back when there is a misfire once the misfire is fixed the P0171 will stay gone, a fuel injector seems logical since if it's sticking it will drive the system lean which is what the 171 code is for.

Online PDF of the manual.

http://www.stihlusa.com/stihl_ownersmanuals/MS171_181_211_Manual.pdf

might try a little oil in each cylnder to help seal and even out pressures

Stihl MS 171 OM follows.
http://www.stihlusa.com/stihl_ownersmanuals/MS171_181_211_Manual.pdf
Starting procedure starts on page 6.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

At operating temp 171 - 181 F, with SAE 10w-30: idle @ 700 rpm 11 psi min, 1200 rpm 28 psi, 2000 rpm 43 psi, and 4000 rpm 57 psi.