39fcr jetting for 426

[crandles]

I just upgraded my 406 to a 426. I was just wondering how much I will need to jet up if at all. On my 39fcr I was jetted at 168 main, 3rd slot from top needle, 3 out on fuel screw.

[cals400ex]

are you using all keihin jets?

[crandles]

yes

[cals400ex]

i would say that should be pretty close. you will pull more fuel through the same size mainjet with the 426 with it being more motor. however, modifications, altitude, and temperature you ride in will matter too.