G'Day Rdemy, hope to see you at the field one of these days

Dubro has a smoke valve system that works off muffler pressure.

Instructions are at this location Cost is about $30-$40 Cdn for the components.

Both Alphonse and myself have installed this system in our bigger planes. Both are using a Saito .91 and we get ample smoke. What has been mentioned here is true in that a .25 2 stroke would probably not generate enough heat to "cook" the smoke oil enough. You would just end up spitting raw smoke oil into your lake where you fly.

I tried some preheating smoke manualy in my Saito .56 but didn't get as much smoke as the .91. Worth trying but I'm not sure if your .25 can pull it off.

If you want to see how it's setup, I'll have the Hog at the field on Saturday, stop on by and see.

Nuker