Hi i have a Thunder Tiger PRO-12BXS ( getting new car and engine soon) and it has been very unkeen to start whithin the past few months, i took out the glowplug found that it was very dim so i replaced that and still no luck, i have tryed different mixture setting but still doesnt help, it usuly takes 25-40 pulls to get it started then about 30 seconds of careful reving before it will go, it sounds choked during that 30 seconds, once it is running it works fine.

Any suggestions of what could be wrong?

Thanks Ben