Carb jet size 10-3678-32

[Bob_pipedream]

Hi all,

Still trying to bottom out my issues here:

Now wondering about the carb. The engine is a new O-320 XP Superior and came with a MA-4SPA part number 10-3678-32.

I found a reference on a supercub site to this having a #47-773 jet ? but not sure if that is right. Other posts on VAF have said that the carb should be a different one and the jet is more like #39 ? but if the supercub site is right, then that seems like a huge difference. My engine runs bad ? but not bad?

So I am wondering what the difference is between the 10-3678-32 and the 10-5135?

Can I just re-jet the carb I have and if so; what should I re-jet this carb to?