Do i need to upjet with a PM61 on my 2007 runner vx125?
i yes, what jets?
you got 2 possibilities !
a 10% higher mainjet with your original carb (is it the 20.5??)
or (and i think this is the better way)
a 25 Carb 4100000 with manifold P2150403and Reed Valve plates M277054
the problem is that the PM exhaust needs high refs, to get a good performance with the 20,5 carb
with the original carb you cant get the right ref