I think I have about 10 tanks in it so far. I am using HPI Power fuel 20% The nearest good hobby shop to me is about 250 kms but there is a crappy one about 100 kms away and thats the only fuel they carry. I have been using OS #8 plugs. I haven't pulled the HSN out of the carb to check for seating though, didn't think of it actually... I checked my fuel lines and tank and they seal well, as does the exhaust and carb.
I will definately pull that needle tonight and take a look see and maybe clean it out a bit. And if that doesnt do it, I guess I'll keep running tanks of fuel through it.
It just seems weird though, this is my second OS .18 CVRX and my first one had tons of power at about 5 tanks and it was still waay over rich.
Thanks for the quick replys and good suggestions guys

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EDIT: BTW, can you guys tell me what your OS's HSN and LSN are set at approx. Yeah I know it varies a lot due to many factors, but maybe my first one was an oddball that will be tuned quite differently than this one. You never know.
Thanks again!