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idling too high after installing pod filter, rejetting...

Started by tmc08, January 07, 2004, 03:58:32 PM

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tmc08

ok guys, i've got a big problem.  i installed a k&n pod filter, yosh exhaust and 150 mains and 40 pilots today.  now the bike will not idle lower than 2000rpm. i've adjusted the pilot air screws out 3 turns as suggested.  i think i've isolated the problem to the carbs.  i've disconnected the throttle cable and turned the idle adjust screw all the way out.  i started dinking around with the pilot air screws, and at the all the way in position i get 2000rpm idle speed. so now, i'm screwed and have no clue what to do from here. oh, and to top it off, when i mess with the throttle spring on the carbs, the idle speed hangs at 4000rpm and doesn't go back to 2000rpm until 30 or 40 seconds later.  but nothing is sticking as far as i can see, the throttle spring snaps back on the carbs and the choke is all the way out.  now, before this project, the bike was fine, i could get it to idle so low that it would stall.  now, nothing below 2000rpm and it hangs if i give it gas. please help, it sounds so nice and i really want to fix it asap so i can ride it. thanks, and i'm not a new member, just forgot my password. any idea how to get that too?  thanks again!

oh, an added note: when i adjust the pilot air screws out the rpms get higher, and i have 2 #4 nylon washers under the needle

SVbadguy

Check the choke cable for binding and make sure it's closed all the way.

Gisser

Try a single washer per needle and make they are no more than .025-to-.030" thick (less than a millimeter) and set the pilot air screws to 2 turns out.  Adjust the idle screw.  That's a good place to start.

tmc08

when you say 'turns' is that a FULL turn (complete circle), or half turn? i've been doing full turns BTW

JamesG

By "Pilot air screw" do you mean the idle mix screw (the one on the bottom at the front of the carb)? Or are you talking about the needles?
:dunno:
James Greeson
GS Posse
WERA #306

tmc08

by pilot air screw, i mean the screws that you have to take the brass plugs off to get to them. i guess i should be calling then the idle mixture/pilot screws, the ones clymer says do not touch, blah blah blah

Gisser

That's right.  One turn = one full rotation.  The objective with the mixture screws is to locate the position--using 1/2 turn increments--usually "out" from 1 1/2 or 2 turns--that provides the highest idle speed, then adjust the idle screw to the desired idle speed.  One carb at a time.  If you don't notice an increase in idle speed when adjusting the mixture screw, then turn 'em out 'til the idle begins to drop, then set it at one turn "in" from that point.

The Buddha

Those are called air screws... Atleast I call them air screw.
Anyway whay did you set them at 2 to begin with. I usually start at 3. Some bikes want them in, other want them out from there. Also dont ever screw those in tight. They should only be lightly seated... cos they are sharply pointed at the other end... and will damage themselves/other parts if you gorilla it. Yes and you may have too much needle as well... but that will be more obvious up high. For idle... set these to 3 turns out. Once the idle settles to where it should be (~12-1300) if you blip the throttle and the idle falls below 1000 and then come back up... its too rich. if it hangs high or stays up at 2K after getting hot... its still lean.
If you have turned the screw about 5 turns out trying to get it richer, well check your floats or other settings. Cos over 5.5 turns it might fall out....
But for now Start at 3. 1.5-5.5 turns out is normal.
Cool.
Srinath.
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