YFZ mods

[TDM713]

Just curious how many people run there YFZs without the airbox lid, and if you do how much does this change the jetting? also race gas, how many people run race gas in there stock 450s? thanks

[Lokiyfz450]

We just pulled the piston and put a new one in after a year on the stock one.
I have only run 92% or better, but it looked like a little bit of detonating was happening. The air lid says recommended (95 ron min). I have put a higher compression piston in so I am going to run 114% or better from now on.