Calling mr. ported R

[glamy]

HI, didn`t want to clog the dumont post! If you had a new 38 keihin and stock barrel with mild dune port what should the settings be? Start with needle clip, witch groove , pilot jet #, main jet # and maybe how many main jets i need to cover the range? I`m going from the crummy 34 round slide to 38 pwk! I`ve got a feeling you`ve done this before!!

[Autophysn]

whatchya say AJ?

[PORTED SHEE]

will u live in san diego right meaning ur about 40 to 50 feet above seal level so ur air is real thick

having a larger carb means having more air causing a lean affect on ur fuel flow

so i would start
168 main
48 or 50 pilot
needle on 4th groove down but i think u can get away with needle on middle groove
i would get main jets from 160 to 170


my last setup before the 310
was trail ported jug ,boysen reeds,pt pipe ,k&n filter and 36 pwk

i ran 165 main
needle on middle groove or 4th groove depending on elevation change
50 pilot

[PORTED SHEE]

other builds
bills pipe,boysen reeds ,k&n filter,polished exhaust port
i ran 162 main ,50 pilot ,needle on 3rd groove

[SandPsycho]

San Diego is sea level..........

[PORTED SHEE]

true
there should be no difference in jetting effect intell 500 feet then 1000 then 2000

[Autophysn]

your my hero!

[PORTED SHEE]

and lets say u go back to the 34 round slide for some odd reason
148 to 150 main
stock pilot
needle on 4th clip or middle clip

[glamy]

They closed all the places to ride down here! The only riding left is in mtns. and thats dangerous fire rds. with blind curves at about 3-4k ft. The only place i ride anymore gordys and glamis and i think thats about sea level. I`m runin a 145 main in it now, 142 before i ported it. So it`s interesting that the 38 is going to be in the 160s on the main. Thats cool info thanks, anything to do with air screws?

[PORTED SHEE]

ya a 34mm round slide uses different main jets sizes becouse of design
a stock main jet on a atc250r would be a 142 main
a stock main jet on a trx250r would be a 150 or 152 depending on years