I have a couple of TT Pro 46's, probably the best engines I have. Not a lot of information but I'll make suggestions based on what you have given. How's the condition of the glow plug? Any doubt, put a OS #8 in it. Are there any loose engine bolts (head or backplate)? And my biggest suspicion is the tank and plumbing. With your finger over the venturi, you should be able to flip the prop about 4 times and see the fuel being drawn to the carburetor. Once I have the fuel up to carburetor I'll take my finger off the venturi and continue to flip another 4 times briskly. All of this prep without the glow plug lighter on. Then all it should take is a couple of bumps with the electric starter, and it should start right up. Set the throttle a little above idle when starting. That engine in my opinion is as good as any OS. I suspect the tank and plumbing is the problem more than the engine.