Get an OS .61FX Mounted in a Funtana 40 using stock mounts?

Not going to happen. By the time you get the 61 FX's crancase fitted between the stock mount, you will have filed away half of the mount.

Get a new mount and install new blind nuts.

i originally put a 61 fx in mine, fitts extremely well, just have to re-drilled the firewall holes and make a bit of clearence for stock muffler if no pitts muffler is used...

if u do not want to cut clearance for mufler and dont want to buy pitts mufler, u can also buy the muffler extention fron os, its about 10$, it fitts 61fx and 91fx as well... works perfect, but might have to change carb settings...

re-drilling holes on firewall, dont think is dificult, i even used the same blind nutts...

ps: in this pic, i rebuilt the landing gear mount and therefore i changed the clearence i made for the old mufler too, since it was not going to fit with the new 91 fx..

FKY1000,

Wow, that's some serious looking muffler. I think a Pitts muffler will not fit inside the cowl either, as there's not much room below the engine inside the cowl. This cowl really is only good for inverted mounted 4-strokes, and perhaps a side-mounted small-case 4-stroke like YS 63.

I have a TT 61 Pro sitting around, and my Funtana 40 is also sitting around w/o flight pack. I haven't bothered to tailor the F40 for the TT61 yet.

well, that muffler is the one for the 91 fx, i put a 91 fx in it and toke the 61 fx out because the 91 fx s the same mounting dimensions, size and weight as the 61fx, so a lot more power for the same weight and size wouldnt heart.....

if u chose to use the muffler extention, the entire muffler will be out of the cowl (there are 2 extentions, short and long; i used the long one, it extends the muffler 3.5cm or 1.37'')..

but if u chose to use pitts muffler, u may need to make a big hole in the bottom part of cowl...

well, have fun and be save guys!!!