I have an older 108. Needle on the carb version... and I have it in a FuntanaS 90. Here is snap of what I had to do to the cowl!!! The pitts muffs don't have enuff back pressure... so use a perry pump or "Pinch the Tubes"... see picture...Oh yeah.. I am at 3000 feet msl and I am using YS 20/20 fuel and an APC 16 x 4W
Go to this post and check it out too.. interesting stuff
http://www.rcuniverse.com/forum/m_16...64/key_/tm.htm

[img]local://upfiles/21727/Rp43065.jpg[/img]