400EX CARB. Q's

[400exrider989]

i have a couple of questions here about the 400EX

i ll start by asking what are the stock jet sizes?

ok so SOMETIMES i ride in calgary, alberta and the altitude is 456 feet i believe, and most the time i ride in sundre and the altitude is 1743 feet, well it really hurt a stock bike to leave the jettings the same for these 2 altitudes?, and well the stock jetting work for these 2 altitudes?, if it well hurt my bike then what jet sizes would be best to run for about 1250 feet that way its in between these 2 altitudes (temp being a range from 10'c and 30'c)?

thanks a bunch lol

Mike

[JOEX]

Originally posted by 400exrider989
i have a couple of questions here about the 400EX

i ll start by asking what are the stock jet sizes?

ok so SOMETIMES i ride in calgary, alberta and the altitude is 456 feet i believe, and most the time i ride in sundre and the altitude is 1743 feet, well it really hurt a stock bike to leave the jettings the same for these 2 altitudes?, and well the stock jetting work for these 2 altitudes?, if it well hurt my bike then what jet sizes would be best to run for about 1250 feet that way its in between these 2 altitudes (temp being a range from 10'c and 30'c)?

thanks a bunch lol

Mike
Stock:
Main 148
Pilot 38
Needle middle slot

I wouldn't worry about that amount of elevation and temperature change on a stock motor.

[Honda#4]

if you go past 3000ft then you need to put in a 142 main and turn your screw down to one turn on inital opening. Someone correct me if i'm wrong.

[400exrider989]

ok thanks, so the stock jetting is alright for my altitudes and climate?

thanks again

Mike

[Honda#4]

Yes it's ok