Keihin 28mm PWK Jetting

[Rigid_Banshee]

Can’t quite get a whole lotta jetting info on these carbs, just looking for a ballpark to get me started.

V force4 reeds, Pro Circuit pipes, stock head, stock bore, elevation is 1100ft ASL ambient temp the bike would be run in is 10 to 30 degrees Celsius

[Ayesully810]

ive never jetted 28s before but i have quite a bit experience with 35s 

a 45 pilot and 145 ish main sounds about right for starts   maybe less main if its really humid. this might be on the rich side.    jjh needles are most used with success with 28s.  get pilot set first so its start and idles good then get main figured out, work needle last middle clip should be good to start. 

Edited March 11, 2019 by Ayesully810

[Keno]

This guide helps tremendously. https://www.duncanracing.com/s/KeihinCarbJetting-2015.pdf

[Rigid_Banshee]

Thank you very much guys ! Same I’ve never messed around with the 28mm pwk’s.

[locogato11283]

All of the PWK carbs will jet similarly.

For that elevation and temp, I would start with 165 main and 50 pilot.. Then work from there.

I've had everything from 33 to 41 PWK and they all jet similarly on a wide range of motors.

[ScEaMin BaNsheE 305]

I have the same carbs coming this week, im at sea level, temps 70-90 F, what jets should i start out with, thanks

 

DMC 916, Uni foam pods no box, chariot reeds, +4 timing, noss head 21cc domes, 

[Keno]

The same ones recommended. JJH needles. Pilots probably somewhere between 45 and 50. Main somewhere between 145 and 165.

Start big and work down.

 

[Rigid_Banshee]

All of the PWK carbs will jet similarly.
For that elevation and temp, I would start with 165 main and 50 pilot.. Then work from there.
I've had everything from 33 to 41 PWK and they all jet similarly on a wide range of motors.

Prefect ! Got 155 mains and a 50 pilots and seemed to get me really close thanks loco !

[SKEETER]

You should thank cam.  Loco had to facetime him and ask...