I normally only work with really old engines often abandoned for a long time and in that case typically hearing crunchy or scraping noises when moving the piston is undoubtedly a bad sign and warrant at least taking off the head and inspecting the bore.
That being said I am now looking at a "new" engine. I put it in quotes because the engine has 0 hours on it but it has been stored in its original package in a storage locker for a couple of years. The engine is a small engine, an 168F chinese diesel engine:
Before running the engine I filled it up with 0.7l of engine oil according to the manual, the dipstick is fine. I gave it a couple of pulls with the pull start and the decompression engaged and could already hear a scraping sound when moving the piston. I did not think much of it, its new, probably barely lubricated yet so might as well be.
I used the electronic start afterwards again with the decompression to get some oil pressure going and splash it around and get things lubed up. When using the pull start again the scraping did not get much better. I ran the engine for a few seconds and there you cant really hear the scraping, but as soon as I stop it and use the pull start again it does sound crunchy...
My thoughts are this is some sort of breaking in procedure? Getting things properly seated together, like rings and bore. Is this normal in new engines? I would like to make sure I am not chasing ghosts here and start tearing the engine apart to inspect whats going wrong :)