I have a yamaha blaster, i changed the jetting apropriately when i got an after market pipe, but now i have more stuff on it.

I was wondering, how do you know what jets to put in. Trial and error isnt enough for me, i wouldnt know which direction to go or how much, and i dont want to buy 20$ worth of jets, and end up using 1.

 

you have to learn to read your plug. bone white=lean, bigger main. black oily plug=rich,smaller main. light brown plug just right can also tell by riding it

01 blu 660r