[jason4410]

new to 4-stroke world
have 07 150r haveing bog problems seen some help on site but have Q,s
what is AP mod?
what is leak jet ? what does it do?
what is back fire screen?

[ThumperX]

The Accelerator Pump mod is where you add a 5/16" o-ring around it to make the pump work as much as 40-80% faster.

Your leak jet is what pushes fuel into your carb as the bikes idles. The bigger it is, the more fuel you'll have in the carb but can also cause it to run too rich. You'll have to change the main jet and needle position also while changing it out an also have to adjust the fuel screw.

The backfire screen is a mesh/metal screen around the cage of your airfilter. Most guys/gals remove them for the purpose of less restriction of air flow.