jetting built 400ex

[416ex_ba]

I have a 00 400ex that I have recently built I have bored it 40 over with weisco and a port and polish with a white bros race cam and white bros full exhaust. It has an after market white bro rev limiter. It has a 155 main jet and I wish to run the air box lid off what jet should I run with these new mods?

[416ex_ba]

forgot I also run b32 race gas which is 110 oct

dynojet ---- start with 160 - 165 also I'd sell the WB CDI it's gonna give you starting problems,,,garaunteed


I have a 416 kit in mine also and a 165 is in there now and she's just a tad fat,,those should get ya close..good luck

[Steven]

I'de say dynojet 165-175 depending on elevation.

My EX has a WB full R4 exhaust, WB race cam, WB rev box and I run a dynojet 170-175 without the air box lid.

I'm in Florida at sea level.

Steve