I have a Magnum 1.8 2 stroke that I need help with. It has standard carb with low end in carb barrel and high end needle on side of carb. I am running 10% fuel with 20% oil. Master 18x8 prop. My problem is that I cannot get ity to run without the ni starter attached. It runs like a top with the ni starter attached, idle to full power. If I take it off, it dies instantly at idle as well as full power. I have tried fox miracle plug, OS type F and A5, plugs with the same results. Does anyone know why this is happening, and what to do to fix it?

Thanks
Voodoo