If you own either a YS 140 sport, or a YS 110, could you please provide me accurate size dimensions,(as measured with caliper). If you are familiar with an motor dimension chart,those dimensions would be great. Mainly, the usual suspects-mounting holes crankcase dimensions etc.

Thanks

Well...I can at least give you the mounting hole dim's.....110/140 front/back center to center =25mm....110 side/side - center to center =52mm....140 side/side - center to center =58mm....

Go to the YS support site at

 http://www.ysengines.net/support/manuals/

Then click on the engine of your choice, you will get the manual for that engine including the dimensions you are seeking

Happy flying, Oscar