its a brand new reciver but, i will take it down to the field with a spare reciever this saturday, and if it dont improve with the movement of the switch ill try the other RX i have, another Futaba 149dp. I just came up from the garage i wraped the ignition wire (spark wire) in that black swivel plastic tube then i zip tied some fuel tube ontop of that so it dont get interference from touching the muffler...
I have a good fealing about the moving of the switch i want to give it a go now but have to wait till the weekend, peace out guys

Ill let you guys know the verdict as it comes to hand...