Mnw1998

I bought a u can do from a guy and it came with a o.s surpass 2 fs.70. But I know nothing about four strokes so what plugs are goud to use. What props work best with this engine. I have decided on using wild cat if that helps any. Please help!!!

jeffie8696

Iuse fuel with 15% nitro and 20% oil in a castor synthetic blend. For a plug I use Merlin 2009. There are manuals available online.

jaka

Hi!
OS F is the plug to use!
As all other engines four strokes like fuel containing 5%-15% nitro!

carrellh

If you do not have it, the manual is online http://manuals.hobbico.com/osm/fs-70...i-p-manual.pdf
The OS type F plug is expensive but works well.
For general flying a 13x6 prop seems to work well.
For 3D you might try 14x4 or 14x4W

Mnw1998

i will try the F plug....i use 15% on everything i use anything. Thanks for the help!!!!