28mm keihin help please

[08yfzman]

here is what i got. its .030 over with trenga carbon reeds, right side pipe k&n no lid with this keihin 28mm pwk. midrange is lean as hell. im on the 3rd clip on needle and get a little sputter around 1/8 - 1/4 throttle when putting around but when wot it revs out to quick in midrange. i can drop the pilot down and get rid of the sputter but its too lean at idle. if i move the clip down on needle the sputter gets worse? so im sure im rich at 1/8 then lean til 3/4 . the needle thats in it is jjh. what should i change? taper, diameter or both?

 

[Herpderplol]

What main jet size are you running? Thats most likely your problem.
Which right bend pipe?
What year?
Recently rebuilt? Leak tested?

 

[08yfzman]

fresh motor no leaks... 158 main 48 pilot

 

[08yfzman]

the main should have nothing to do with my sputter issue at 1/8 throttle

 

[08yfzman]

its a trenga right side pipe and silencer

 

[Awk08]

What main jet size are you running? Thats most likely your problem.

not if the hesitation sputter is at 1/8 - 1/4 throttle and revs too quick thru the mids.
that has nothing to do with a main jet.

the Op is onto what his troubles are...
the pilot/airscrew and that needle.

follow these steps, in this order, for a perfectly jetted carb....

properly clean the carb
http://www.blasterforum.com/carburetor-138/how-clean-your-carb-pics-209/

check/set float height
http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/

adjust airscrew/pilot jet
http://www.blasterforum.com/carburetor-138/adjusting-your-airscrew-pilot-jet-51060/

call carb parts warehouse for a needle, he knows his sh*t and will set you straight on what needle you need for your mods (and pilot/mains too)
Carburetor Parts Warehouse

start rich and plug chop main jet down to perfection
http://www.blasterforum.com/carburetor-138/how-plug-chop-53237/

 

[08yfzman]

not if the hesitation sputter is at 1/8 - 1/4 throttle and revs too quick thru the mids.
that has nothing to do with a main jet.

the Op is onto what his troubles are...
the pilot/airscrew and that needle.

follow these steps, in this order, for a perfectly jetted carb....

properly clean the carb
http://www.blasterforum.com/carburetor-138/how-clean-your-carb-pics-209/

check/set float height
http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/

adjust airscrew/pilot jet
http://www.blasterforum.com/carburetor-138/adjusting-your-airscrew-pilot-jet-51060/

call carb parts warehouse for a needle, he knows his sh*t and will set you straight on what needle you need for your mods (and pilot/mains too)
Carburetor Parts Warehouse

start rich and plug chop main jet down to perfection
http://www.blasterforum.com/carburetor-138/how-plug-chop-53237/

im guessing the carb parts guy is closed today?

 

[Awk08]

im guessing the carb parts guy is closed today?

i would assume that also, he's prolly grillin some burgers with the family I:I

 

[08yfzman]

this is my wifes bike and she is learning to ride with a clutch so i gotta get it tuned right . previous owner ran it way to lean. it had a 145 main in it and when i chopped it the plug was white as a ghost

 

[08yfzman]

i guess i shoulda figured... that guy was a retard, said it was a 240. when i opened it up it was .020 over

 

[Awk08]

this is my wifes bike and she is learning to ride with a clutch so i gotta get it tuned right . previous owner ran it way to lean. it had a 145 main in it and when i chopped it the plug was white as a ghost

the lower circuts..pilot and needle, also contribute to overall jetting, and that lean pilot/needle may have been a factor in that lean plug chop ?
start at the bottom with the float setting and jet up thru the pilot and needle ranges, then plug chop last, you may get different results with that 145 main ?

 

[08yfzman]

im guessing the carb parts guy is closed today?

thats where the carb came from i guess by the cpw sticker on the carb

 

[Awk08]

thats where the carb came from i guess by the cpw sticker on the carb

yep, and possibly jetted for another bike, or stock blaster ?
that right bend trinity (what i run) requires the richest jetting of any of the 5 different pipes i have tested (Trinity, F7, LRD, Dyno-Port and Toomey)

 

[08yfzman]

the 145 chop at wot was white and now at 158 is tanish brown ....ive tried as low as a 40 pilot and from the second -4th clips on the needle.....either way im still lean in the mid

 

[Awk08]

the 145 chop at wot was white and now at 158 is tanish brown ....ive tried as low as a 40 pilot and from the second -4th clips on the needle.....either way im still lean in the mid

my jetting drove me nuts for over a month, until i made that call to CPW, he suggested a "DGH" needle for my 34mm PJ, it's spot on in the middle clip position

follow the link i posted above for tuning the pilot/airscrew circut to find high idle and the correct pilot that "high idles" between 1/2 and 2 turns out. it is the only way

 

[08yfzman]

once i get the needle right i may even go fatter on the main

 

[08yfzman]

i did that for the pilot my screw is out about 3/4 idles great fires up first kick

 

[Awk08]

my guess is, once you fatten up that needle, your main will require leaner ?

have you searched thru the 28mm jetting threads for a starting point ?....
http://www.blasterforum.com/searchresults.php?cx=partner-pub-9438014176008015%3A9127094460&cof=FORID%3A9&q=28mm+jetting&sa=Go

or....

http://www.blasterforum.com/carburetor-138/what-jets-you-using-28981/

 

[08yfzman]

this is what i ride

 

[Awk08]

this is what i ride

hot damn thats nice !!!
ELKAS FTW I:I