I am almost done tuning the IDA 48 on my street port 12a, but I cant seem to find accelerator pump jets in any size, mazda trix has the bypass block, but I would like to try bigger pump jets for when I am tuning on larger size choke tubes, what are reasonable size chokes to be running, I got 37mm right now and running a good mix, but I want to run my 42mm chokes, when I open the thottle up in any way but very very slowly the AFR goes very lean (only for a moment) with the 42's, I think I need bigger pump jets, but where can I get them?
any ideas from the weber guys out there?
Thanks in advance

 

Do a search. I posted many tips on how to modify a 48 IDA