The YS 1.20 "FZ" was the last variation of the YS 1.20 engines...It's a good engine....If it's truly a Brand New ***Never Run*** you should be good to go...If he ran it or if it's even seen fuel I would recommend having it serviced by YS Parts and Service prior to running...You might wanna get a few spare diaphragms, diaphragm gaskets, regulator plungers and plunger springs just to have on hand...OS type F glo-plugs...
Have you ever run YS engines before?? There are YS lovers and there are YS haters...I'm a YS lover and have pretty much used YS engines only since I've been flying RC...I have five 4 cycle and several 2 cycle YS engines...I learned early on my basic principals for being a happy YS owner...
1) Use fresh fuel (Synthetic 2 cycle fuel with 20% oil - Nitro whatever you want, I use mostly 15-20% nitro across the board) (I have just got a new DZ engine which I will use 30% heli fuel)
2) Once it's set up don't touch anything!! (You may occasionally adjust the high speed needle a click or two but that's about it)
3) Leave the Brass Screw Alone!! (The Brass Regulator Screw that is)
4) Run the #*!! out of it...Don't let it sit...If your going to store it use Ultra Oil for long term storage...(some folks use Mobile-1 Synthetic motor oil)
5) No petroleum based products!! They will wreak havoc on the silicone diaphragm and o-rings...
6) Run it a little richer than you think it should be (especially early on...You can back off a little once it breaks in but still run it on the "rich side" of tolerance...If your glo plug fails it's too lean...Well maybe once a year is OK but you shouldn't have to replace glo plugs hardly ever)
7) Use only good quality fuel tank's and hardware...Wrap the fuel tank with re-unforced packing tape or duct tape...
8) Release the tank pressure after running the engine or after every flight...(You
Will learn this...One way or the other you will learn...)
9) Run the fuel out of the engine at the end of every session... (Or Else...)
Don't spend too much time bench running it for break in...A tank or so just to make sure it's reliable then go fly...Keep it rich for at least two gallons of fuel...**If** you need to touch the regulator screw adjust it in
Very Small Increments (1/16 to 1/8 turn)...Use your normal prop or slightly lighter loaded for break in...Vary the throttle some not just wide open the whole time...Let it cool completely between flights...
There are some pretty good articles out there on the web about running YS engines...Troy Newman has some good info on his site plus there are others...I learned on my own but I'd recommend reading what the experts have to say...With YS engines there is a thin line between being a lover or a hater...Being a hater IMO is normally self induced...So do a little reading and you'll be a lover...
Enjoy!!
Chuck
Edit:
Here are some links you may find useful:
http://www.rcuniverse.com/forum/m_5394522/tm.htm
http://www.geistware.com/rcmodeling/...ys_engines.htm
I can't find Troy Newman's "Pattern Page" on the web?? It use to have some good info... You can do a search in the RCU YS Support Forums is you like:
http://www.rcuniverse.com/forum/forumid_197/tt.htm