This Sig engine mount will fit perfect on the firewall and under the cowling, but it's rated for .19-.61.

Is there a risk in using it? It's as beefy as other mounts I have seen for the .91 size engines.

http://www.sigmfg.com/cgi-bin/dpsmar...001.html?E+Sig

Gary,
To be totally honest with you I wouldn't use it. YS engines are real stump pullers. There's a good chance it'll tear a 60 size mount apart. To get a sense of security I would get a larger size mount.

Ken

Thanks Ken. The great planes large mount does not fit under my cowl.

If you are going to use a YS110 I would highly recommend a Hyde or Budd engineering soft mount. These engines produce tons of power. Dont be fooled by the 110 displacement it runs more like Saito 150. You can purchase these mounts from Central Hobbies or Budd engineering.com

I don't know about you guys I used the YS110 on my H9 F90 with the stock mount and also on the Seagull Harrier 90 and its stock mount and later on the WM Super Chipmunk with the stock mount, nothing came off. It held on fine ...

The Dave Brown 90FS--9004 fits the 90 and the 110 YS perfectly and because of the round firewall backplate and the uneven (non square) bolt pattern it will fit the tightest of situations. even the top part of the bridge can be cut away for making room for the airbox if needed for CG purposes and it still very durable but break when you want it to. i.e. during a crash.

John