I have a 2001 400ex with a WB slip on and a rev box. I put in a 416 kit and was wondering what i need to run for jets in the carb.

 

If only the bore was changed, try running the jetting you were already using. If other things changed you may need to jet, but you will need to list those mods.

 

Tractor Packer,

Thanks for the info. I was gong to upgrade bore size on a DS650 running a Honda 450r carb,
and was worried about breaking my rings in correctly if in the first few minutes while trying to tune it too.

So it sounds like if I have 450r carb dialed in before get big bore, I will be alright.


Thanks again!