Iam using 20% traxxas, I got it running good today I had to richen hsp out 4.75 turns from closed, stock is 4. lsp 2 out from closed stock is 1.75. I sealed back plate, carb, just like you suggested. carb rebluild was, new carb body and all new o rings. I use traxxas glow plug 3332x.. fuel system isair tight, thanks for input