Hi all,

I have a Rossi Aereo .40 that I'll be using in a Javelin II. Thing is, I don't have the manual and the muffler looks like it's somehow adjustable. I don't want to fiddle with it and risk damaging the thing.

The way it is now it seems to rob a considerable amount of power if compared to when the engine is run without it.

The muffler can be seen here:

http://www.axemotor.it/images/r40a.jpg

Thanks for any help!