the engine is a nitro star .12r xs ..
I plan to do some more testing with it tomorrow and see what I come up with.
I had run it with 30% without adding the shim first and it ran with plenty of power but at about 250deg.. so I thought I would add the shim and see how it ran..
one thing I am going to do for sure is to switch back to odonnel fuel.. I can't say that I care for sidewinder.. too many extras added in it, plus it stinks..