Topic: Advice needed....am I running lean?

[redlabel]

Hi!
I am currently running my CB400F with pods and a straight slash cut pipe. Pilot #38, Main #90 and mix scre 1 1\2 turn out....I haven't moved the clip on the needle(Maybe I should have?)
The bike is not the easiest to start and doesn't idle very nice. When I am on the road she pulls good without hessitation, but alot of popping trough the exhaust on deceleration. This normaly indicates a lean mix, but original main jet is #75 so I would think that #90 should be big enough. It runs hot after "long" runs and if I stop after an 40-60min run, she wont start before it cools. New coils and ignition.
Cylinder 2 is not in sync with the other carbs it appears....

[Powderman]

Yes. What did you expect with that combination of pipe and filter?

[redlabel]

Yes. What did you expect with that combination of pipe and filter?

I expectet to run lean.......that's why i changed the mains to #90. :p
I have read of others with same setup that is running fine on #85 mains.

[mcswny]

Well at least she looks nice?

I would start by setting your idle mixture screws and give yourself a good sync. I don't know much about jetting for pods/open pipes. But if your saying you know plenty of people that are running well with #85s, it sounds like it could be with your idle mixtures? Just a thought.

[harisuluv]

yeah you already alluded to the needle clip position issue.  unfortunately changing your main jet only predominantly affects 3/4 - WOT.  Needle clip position is 1/4-3/4, or in other words, the majority of your throttle band.

Stock is 3/5, so you should be at 4/5 (from top) to help your problem.  A vacuum sync is probably in order too.

[redlabel]

yeah you already alluded to the needle clip position issue.  unfortunately changing your main jet only predominantly affects 3/4 - WOT.  Needle clip position is 1/4-3/4, or in other words, the majority of your throttle band.

Stock is 3/5, so you should be at 4/5 (from top) to help your problem.  A vacuum sync is probably in order too.

Thanks guys! I thought it could be the clip yes....not sure why I didn't change that when jetting it. Probably a naging misses og one of the kids baning their head on something.....
I did a sync last week, but will adjust needle and do anotherone. I am aslo ditching the pods and putting in Uni foam filters.
Man I love this place! TY!

[Deltarider]

and give yourself a good sync

Yeah, I agree, make sure your lungs work simultaneously and are not fighting eachother. 

[redlabel]

Thanks

[Rgconner]

Yes. What did you expect with that combination of pipe and filter?

I don't understand why they went with pods when they did not even open up the frame triangle.

Kinda pointless.

[flybox1]

90 mains are fine.  you're getting some gas, but only above 1/2 throttle.  this is why it accels fine here....
ditch those expensive iridium plugs and run plain NGK D8EA plugs.
#40 pilots
air screw at 1 turn out
lower the needle clip one slot.
retest.

[harisuluv]

uni foam filters (plural).  you mean uni foam.. pods?

[redlabel]

uni foam filters (plural).  you mean uni foam.. pods?

Say what now?! I am changing out the K&N copy pods for 4! UNI foam air filterS. Is there something wrong with the grammar? I'm from Norway, so english is not my native language.....

[redlabel]

Yes. What did you expect with that combination of pipe and filter?

I don't understand why they went with pods when they did not even open up the frame triangle.

Kinda pointless.

What's pointless is your post, good sir.
I went with pods to make her breath easier and because I liked the look of the pods.

[redlabel]

90 mains are fine.  you're getting some gas, but only above 1/2 throttle.  this is why it accels fine here....
ditch those expensive iridium plugs and run plain NGK D8EA plugs.
#40 pilots
air screw at 1 turn out
lower the needle clip one slot.
retest.

Hi.
Why should I ditch the iridium? I wont get my money back, so is there a reason why I should run the standard D8EA instead?
So I should change my #38 pilot back to stock #40?

[flybox1]

Your grammar is fine, redlable 
D8EA's are closest to what was originally recommended by HONDA. (DensoX24ES-U)
I cant say i know of many who have had noticeable improvement with the Iridiums to be worth the extra expense.
You're going to want to perform some plug chops anyway, to get your jetting correct....and with fresh plugs at each step.  D8EA's are much cheaper.

At idle and up to 1/3 throttle, does your bike perform better with a little choke?  This is a test for lean idle/pilot circuit.
if your performance improves at low throttle positions, your 40's pilots should be really close to getting your mixture here correct.

[Rgconner]

Yes. What did you expect with that combination of pipe and filter?

I don't understand why they went with pods when they did not even open up the frame triangle.

Kinda pointless.

What's pointless is your post, good sir.
I went with pods to make her breath easier and because I liked the look of the pods.

Because the bikes, and you can read about it on this site in many posts, makes getting idle and mains difficult to tune.

The bike was intended to run with "still air" from the airbox, not from pods. The air from pods tends to be turbulent and causes rough idle or stumbling on acceleration.

A 400 is unlikely to be air restricted from the airbox if the filter is maintained.

Straight pipes are going to complicate the process even more.... but hey, it looks good!

Everything you ever wanted to know about SOHC4 carbs:

http://forums.sohc4.net/index.php?topic=5410.0