421 seval cub where to start on mains

[boohilux]

421 seval cub using stock 26mm carbs mods are fmf gold series pipes pc2 muflers +4 timming boysen pro serries reeds k&n filter no air box elevation 1200ft temp 25c

 

what is a good starting point for the main jets thanks

[dirtydownunder]

Around 320-330main.

[rjdgriff]

At 1000' and 75* I was running a 300 in my stockers with t5 pipes vf3s +4 timing airbox with proflow (no lid) cool head and 24cc domes

[maskmanLS6]

I would say youll wind up between 330 and 350. with a 30 to 32.5 pilot.

[rjdgriff]

Had a 27.5 pilot in mine

[vulvafan537240]

32.5 pilot is HUUUUUGE!!! id say no more than a 27.5, maybe a 30.