Factory pro config 30 woes

[Sean]

Cool. Ok I'll get the video up. Prob tomorrow.  She idles now but surges and returns idle irregularly on her own and sometimes dies when coming to an idle after a run (like at a stop sign). I live in Pittsburgh Pennsylvania and its been hot and humid. I have iffy compression on one cylinder  (we suspect a bad piston ring did the whole squirt oil in and retest thing). I have a parts bike potentially lined up and plan on boring out this engine in the off season. Right now my floats are at 15mm with the 117 jet and the needle clip is on the top most notch this is the least rich I've been able to get her to run. I have been toying with the thought of unpluging the pilot screw tamper plug and try adjusting that in my next carb sync. Bad idea?

[TJS]

Yes, remove plug! Adjust screw to three turns out. That should help some idle issues. Then using a really small screw driver you should be able to leave the carbs on and adjust at 1/4 turn increments. Don't get confused in what direction you turn. It can be confusing after just looking at the bottom of the carbs on a table, then trying to turn them on the bike and switching from each side of the bike to reach the carbs.
I will try to see what size jet I am using tomorrow afternoon. I would think raising your needle would help. Air screw, slow jet (probably stock), and needle are working at lower rpms before getting on the main jet (117).

Make this a favorite:

http://www.factorypro.com/

pruduct support, motorcycle tuning tech, CV Carb tuning (on left side of page), High RPM engines (in red letters)

[TJS]

Now go back to CV Tuning. Scroll down to The "Tuning" section. You will find the Bandit 400. Make this a favorite.

[Sean]

Oh wow the bit on tuning, further down the page where it mentions the pilot screw, seems to to pretty much hit the nail on the head "lean surging" seems to be my issue. Before we do anything I'll take a video and post it. Thanks for all of the advice so far!!!!

[Sean]

Ok video will be up tomorrow. I left my camera at my girlfriends mothers house (where I'm keeping the bike) and I went back to my apartment without it. I think youre spot on about setting the floats back to stock because she didn't want to start at first I had to put her on charge and then on the second round of tries I got her to start, this is the first time this problem presented.  This is also the first time she started cold with her current float height. (1mm above stock 15.6mm). Just thought I'd keep you updated. Is it ok to set the floats down and pull the pilot screw plugs ASAP like right after I get the video up or should I hold off until you can analyze the video?

[TJS]

Go for taken the plugs out! You are on the right path. Follow the factory pro info and you will be fine. Trial and error...patience.
I am running the 117 main jet also.

[Sean]

Videos

Initial start
http://www.youtube.com/watch?v=BrTCuO-vslQ&feature=youtube_gdata_player

After warmup
http://www.youtube.com/watch?v=CTEIryJR0Xc&feature=youtube_gdata_player

I hope the links work
Smoke is gone form the exhaust. Good I guess. Working on unplugging the pilot screws now and lowering the floats.

[Sean]

http://www.youtube.com/watch?v=vDzPIHuLwxM&feature=youtube_gdata_player
Again, right after a short ride.
Very similar to the previous.

[TJS]

Check for vacuum leaks around intake boots ie cracks, loose clamps...
How many turns out are you on the aircsrew? If you are 4 turns out, you need a bigger pilot jet.

[Sean]

I'll check for cracks.. I usually crank the screws on the boots down pretty tight. After I drilled out those plugs I screwed the pilot screws in all the way and it turns out that they were all only 1.5-2 turns out. Backed them out to 3 and she seems to idle alot better. I haven't gone for a test ride yet but i will soon and have new videos as well. Thanks for the help, I hope this is the fix I'll keep you posted.

[Sean]

Visually no cracks. I am out of carb cleaner to spray on it to check ill do that later. After the test ride I noticed considerably more low end power and idle is still better but I'm gunna tweak it a but. Still doesnt like anything below 16k. 3 turns out so that should be stock right? It's to be expected that I should be a little further out than stock, correct?

[TJS]

Stock is about 2 turns out. 3 turns is good. Try 3 1/2 turns out. Then a little more or less.

If you get to 4 turns out to fix your idle:
 * may need bigger pilot jet
* Carbs may need to be syncronized
* try for 900-1,200 rpm idle

What clip are you on the needle?

[Sean]

Im on the top most notch for the clip. I will sync the carbs tonight.

[TJS]

If this doesn't work; check the carbon build up on your valves and make sure no gas is in your oil. Gas in your oil means your float needles need to be replaced.

[Sean]

Whoops in my last post I intended to say 1600 rpm not 16k. Whoops.