What main jets should I order for my mikuni VM 20 And where

[gabeshong]

I have a 1980 Yamaha 125 with a stock mikuni vm 20 carb. I'm putting on a K&N air filter and wondering what size main jet is stock so I can order bigger one. I know I should order a few to find the best one but which ones should I order? And where can I find them online. Thank you.

[pandphomealone2]

I also have a YTM125.
I removed the baffles from the stock muffler and eliminated the spark arrestor.
It doubled the HP, but it was a little lean
The stock jets were 25 & 200.
I replaced them with 30 & 210.
This bike is a ripper, the power is unbelievable from a 125.
I bought the jets at the Yamaha dealer for 3$ each.
I hope this helps.
Good luck.
PM me if you need more info.