grp problem
+1 bigedmound. ran grp all this yer put 8 gallons on it. top is to lean and bottom is to lean. i would richen bottom like 3-4 hours and top same way. only lean top so that it clears out down the staight. use bottom end for tunning. start tuning from bottom and temps will drop. also run grp num4 plugs helps alot. jp3 or msr 1009 pipe make motor come alive and cool temps down