Re: Martin 75 with Carter N Carb with broken jet

[amuller]

I think it would be less confusing if you call the problematic piece the "needle" not the "jet."

Comparing the needle in the lower carb pictured can probably tell you how deep you would need to drill. At this point I would suspect the best alternative would be to drill out the needle to below the threads, and enlarge the hole as much as you can without drilling into the carb body. At that point the remains of the needle will hopefully fall out, and you can pick out residue and retap the threads. If you have access to left handed drill bits it would make sense to use them, as at some point the bit might catch and bring the remains out. I’ve never had much luck with EZouts but some people swear by them. this is a job that would be much easier with a mill and some small end mills, but should be doable on a drill press. Since you will still need another needle it might make sense to look around for another carb. (but, carbs often have subtle variations specific to the application…..)