i have a new hangar-9 funtana 90
what is the best engine for it a saito 100 4 stroke or a saito 120 4 stroke

Most everybody has been saying that the 100 is too weak. A 120 should be fine, bu if I were going with a "big block" I would go for the 150/ 180. A friend of mine has a 150, and I was a little suprised... less power then I thought it would have. But it hasn't even been broken in yet, and that is probably why.

welcome to the forums, please try the SEARCH function, you will find many answers there. Here is a great thread and will hopefully have the answers you seek:

[link=http://www.rcuniverse.com/forum/m_1690007/anchors_1690007/mpage_1/key_/anchor/tm.htm#1690007]Funtana 90 thread[/link]

nahh dude juz test flew a funtana 90 with a moki 1.35 stupid vertical amazing i heard the ys 110-fz was good for it 2