ok o just got stage one power kit for my yfz and i got a lil confused when the instructions told me to use a 134MJ at 3000 elevation and with a slip on but ik that the stock jet is 158 so how can that be? does dyno jet size their jets differently?

 

man tahts does sound weired man,
i would give them a call and check that out, and maby the instructions arent even for that I dont know

 

Yeah dyno jets are way diffent than stock mukini.. i dont know exactly what the differnce is but.. i belive in my case a 150 dynojet is like a 175 mukini or sumthing like that its like diffent lol