yet another no idle thread.

[stainlesscycle]

i tore it all apart again this morning.

slide and carb looks good.
double checked all passages in carb. no blockage in idle/pilot circuit.
double checked float height - it's at 16mm
pulled reeds, looked fine - they are carbon fiber ones if that makes a difference..
airfilter is clean.

to double check a/s circuitry i rode around with a/s at 0 turns. it works. i reset at 1.75 turns out.

investigated how far the slide moves up and down in relation to idle screw. with an unmodified idle screw/spring the idle screw hits the slide at 6 turns out. it should idle at around 2 - 4.5 turns out.

still no idle. i can only get it to idle by adjusting either throttle adjuster. i know by looking at how high the slide is at that point that i'm probably bypassing the pilot circuit completely.

bike pulls smooth and even and as close to perfect as it's been with the settings it has now. pulls front end up easily with no clutch in first 3 gears. no stuttering, no hesitation. instant power at all throttle openings - very strong at 1/8-1/4 throttle where you're just zipping through the woods.
bike starts first kick hot or cold (choke for cold for just a second or 2.. BUT it used to race like crazy if i left the choke on for more than a second. now it doesnt. it just makes throttle response and exhaust note dull...i'm assuming this is a clue.....) i swapped to another choke assembly, but no change.

i had a spare #7 slide with a notch in it. (the one i was running had no notch) - neither slide had any noticeable difference.

so do i get a slide cut to #8 or should i be looking elsewhere? or go to a 40 pilot and see what it does? 40 pilot seems like i would be getting pretty lean... jetting dbase doesn't show anyone with ddk/40/172/#7 - but there are some leaner, but with different needle....

[stainlesscycle]

i've been dinking around so much with this carb, it's given me a chance to completely rejet...so i'm really happy with it (no 4 stroking at the bottom, pulls hard,etc. but still no idle.)

172, 42, ddk #2, 1.5 turns out. 80 degrees, 1000ft. #7 slide (notched)

[GMP]

Next would be #8 slide, or for a cheaper attempt, a needle with a leaner straight diameter. All indications are your too rich in this area. There is enough 300 jetting data here to make your head spin.

[SideshowBob]

FYI- I was totally happy with my jetting. It never idled though. After the RB designs mod it does and it pulls harder.

[stainlesscycle]

Originally Posted by GMP

Next would be #8 slide, or for a cheaper attempt, a needle with a leaner straight diameter. All indications are your too rich in this area. There is enough 300 jetting data here to make your head spin.

yep, i could go to 40 pilot, but i think that's masking the issue, and perhaps too lean somewhere?

i don't any other reason it doesn't idle anymore. the temps went way up, and my jetting became rich, so i leaned and it runs great but will not idle. it would idle with my previous settings when the weather was cooler. but the 30 degree temp rise made that jetting useless (and it won't idle with that jetting now..)


i've got a spare slide i'm planning on sending out, hopefully that will solve the problem. if not i don't know where to look.


leaner straight diameter would mean thicker needle. so ddl or ddm. i guess i'll order one or both and see what they do..

[stainlesscycle]

tried 40 pilot. still no idle. it's basically like the idle screw and the air screw have almost no effect.

this kinda tells me something else is going on. i think i have a spare pwk 38 maybe a carb swap is in order.... if that don't fix it maybe my ignition is weak??? i would doubt that.....

i also ordered new reeds for the hell of it. i know they're gonna go eventually, so i'm just gonna put new ones in.

[webmaster]

I think one of the previous posters here meant the needle orifice - and that is my thought too. The "nozzle" will oval over time from engine vibes.... Given that the bike is a 2001 - this is probably the problem.

No replacement available from keihin...

RB Designs machines new one and will replace it - but this may only be included in his complete carb mod...

jeff

[stainlesscycle]

yeah, i was kinda thinking that it might be the issue, since i've went through everything else. i'm going to swap a different carb in and see - then at least i can narrow things down to carb body issue..

[mrkartoom]

Have you thrown in a new plug just for kicks? What does it look like right after it dies? I agree it sounds like you are very rich here for some reason.

[mrkartoom]

Originally Posted by SideshowBob

FYI- I was totally happy with my jetting. It never idled though. After the RB designs mod it does and it pulls harder.

Carb mod or squish band . . . or both?